{"id":10006472,"date":"2022-09-14T11:27:19","date_gmt":"2022-09-14T03:27:19","guid":{"rendered":"https:\/\/ityet.com\/?p=10006472"},"modified":"2022-09-14T11:27:19","modified_gmt":"2022-09-14T03:27:19","slug":"%e3%80%901-2-golang%e3%80%91go%e8%af%ad%e8%a8%80%e5%bf%ab%e9%80%9f%e5%85%a5%e9%97%a8-%e6%95%b0%e7%bb%84%e4%b8%8e%e5%88%87%e7%89%87","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006472","title":{"rendered":"\u30101-2 Golang\u3011Go\u8bed\u8a00\u5feb\u901f\u5165\u95e8\u2014\u6570\u7ec4\u4e0e\u5207\u7247"},"content":{"rendered":"

  \u6570\u7ec4\u548c\u5207\u7247\u662fGo\u8bed\u8a00\u63d0\u4f9b\u7684\u4e24\u79cd\u57fa\u672c\u6570\u636e\u7ed3\u6784\uff0c\u6570\u7ec4\u7684\u6982\u5ff5\u5927\u5bb6\u5e94\u8be5\u90fd\u5f88\u719f\u6089\uff0c\u76f8\u540c\u7c7b\u578b\u5143\u7d20\u7684\u96c6\u5408\uff0c\u4e14\u5143\u7d20\u5728\u5185\u5b58\u4e2d\u8fde\u7eed\u5b58\u50a8\uff0c\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u7684\u901a\u8fc7\u4e0b\u6807\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\uff1b\u90a3\u4e48\u4ec0\u4e48\u662f\u5207\u7247\u5462\uff1f\u5207\u7247\u53ef\u4ee5\u7406\u89e3\u4e3a\u52a8\u6001\u6570\u7ec4\uff0c\u4e5f\u5c31\u662f\u8bf4\u6570\u7ec4\u957f\u5ea6\uff08\u6700\u5927\u53ef\u4ee5\u5b58\u50a8\u7684\u5143\u7d20\u6570\u76ee\uff09\u53ef\u4ee5\u52a8\u6001\u8c03\u6574\u3002\u5207\u7247\u662f\u6211\u4eec\u65e5\u5e38\u5f00\u53d1\u6700\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\u4e4b\u4e00\uff0c\u5e94\u8be5\u91cd\u70b9\u5b66\u4e60\u3002<\/p>\n

\u6570\u7ec4<\/h2>\n

  \u6570\u7ec4\u7684\u5b9a\u4e49\u4e0e\u4f7f\u7528\u975e\u5e38\u7b80\u5355\uff0c\u5982\u4e0b\u9762\u5b9e\u4f8b\u6240\u793a\uff1a<\/p>\n

package main\n\nimport "fmt"\n\nfunc main() {\n  var arr [3]int\n  \/\/\u6570\u7ec4\u8bbf\u95ee\n  arr[0] = 100\n  arr[1] = 200\n  arr[2] = 300\n\n  \/\/arr\u6700\u5927\u53ef\u4ee5\u5b58\u50a8\u4e09\u4e2a\u6574\u6570\uff0c\u4e0b\u6807\u4ece0\u5f00\u59cb\uff0c\u6700\u5927\u4e3a2\n  \/\/Invalid array index 3 (out of bounds for 3-element array)\uff1b\u8bbf\u95ee\u8d8a\u754c\uff0c\u65e0\u6cd5\u7f16\u8bd1\u901a\u8fc7\n  \/\/arr[3] = 400\n\n  fmt.Println(len(arr), arr) \/\/len\u8fd4\u56de\u6570\u7ec4\u957f\u5ea6\n\n  var arr1 [5]int\n  \/\/\u6570\u7ec4\u7684\u7c7b\u578b\u5305\u62ec\uff1a\u5143\u7d20\u7c7b\u578b + \u6570\u7ec4\u957f\u5ea6\uff0c\u4efb\u610f\u4e00\u9879\u4e0d\u7b49\uff0c\u8bf4\u660e\u6570\u7ec4\u7c7b\u578b\u4e0d\u540c\uff0c\u65e0\u6cd5\u76f8\u4e92\u8d4b\u503c\n  \/\/Cannot use 'arr' (type [3]int) as type [5]int\n  \/\/arr1 = arr\n  fmt.Println(arr1)\n}<\/code><\/pre>\n
  \u5728\u4f7f\u7528\u6570\u7ec4\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u91cd\u70b9\u6ce8\u610f\u4e0b\u6807\u6700\u5927\u503c\u4e3alen – 1\uff0c\u4e0d\u8981\u51fa\u73b0\u8bbf\u95ee\u8d8a\u754c\u60c5\u51b5\u3002Go\u8bed\u8a00\u6570\u7ec4\u548cC\u8bed\u8a00\u6570\u7ec4\u4f7f\u7528\u975e\u5e38\u7c7b\u4f3c\uff0c\u4f46\u662f\u5728\u6570\u7ec4\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570\u4f7f\u7528\u65f6\u5019\uff0c\u8fd8\u662f\u6709\u4e9b\u8bb8\u4e0d\u540c\u7684\u3002<\/p>\n
  \u9996\u5148\u8981\u660e\u786e\u4e00\u70b9\u7684\u662f\uff0cGo\u8bed\u8a00\u51fd\u6570\u4f20\u53c2\u90fd\u662f\u4f20\u503c\u7684\uff08\u8f93\u5165\u53c2\u6570\u4f1a\u62f7\u8d1d\u4e00\u4efd\uff09\uff0c\u800c\u4e0d\u662f\u4f20\u9012\u5f15\u7528\uff08\u8f93\u5165\u53c2\u6570\u7684\u5730\u5740\uff09\uff0c\u56e0\u6b64\u867d\u7136\u4f60\u5728\u51fd\u6570\u5185\u90e8\u4fee\u6539\u4e86\u8f93\u5165\u53c2\u6570\uff0c\u4f46\u662f\u8c03\u7528\u65b9\u53d8\u91cf\u5e76\u6ca1\u6709\u6539\u53d8\uff0c\u5982\u4e0b\u9762\u4e8b\u4f8b\uff1a<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n  arr := [6]int{1,2,3,4,5,6}\n  testArray(arr)\n  fmt.Println(arr)  \/\/\u539f\u6570\u7ec4\u672a\u53d1\u751f\u4fee\u6539\uff1a[1 2 3 4 5 6]\n}\n\nfunc testArray(arr [6]int) {\n  arr[0] = 0\n  arr[5] = 500\n  fmt.Println(arr) \/\/\u4fee\u6539\u6570\u7ec4\u5143\u7d20\uff1a[0 2 3 4 5 500]\n}<\/code><\/pre>\n
  \u5b66\u4e60\u8fc7C\u8bed\u8a00\u6570\u7ec4\u7684\u4f19\u4f34\u53ef\u80fd\u4f1a\u6bd4\u8f83\u7eb3\u95f7\uff0cC\u8bed\u8a00\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u8c03\u7528\u65b9\u6570\u7ec4\u5143\u7d20\u662f\u4f1a\u540c\u6b65\u53d1\u751f\u6539\u53d8\u7684\u3002Go\u8bed\u8a00\u662f\u600e\u4e48\u505a\u5230\u7684\u5462\uff1f\u4e0a\u9762\u8bf4\u8fc7\uff0cGo\u8bed\u8a00\u51fd\u6570\u4f20\u53c2\u90fd\u662f\u4f20\u503c\u7684\uff0c\u6240\u4ee5Go\u8bed\u8a00\u4f1a\u628a\u6570\u7ec4\u6240\u6709\u5143\u7d20\u5168\u90e8\u62f7\u8d1d\u4e00\u4efd\uff0c\u8fd9\u6837\u51fd\u6570\u5185\u90e8\u4fee\u6539\u7684\u6570\u7ec4\u5c31\u548c\u539f\u6570\u7ec4\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb\u4e86\u3002<\/p>\n
  \u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u770b\u770bGo\u8bed\u8a00\u6c47\u7f16\u4ee3\u7801\uff0cGo\u8bed\u8a00\u672c\u8eab\u63d0\u4f9b\u6709\u7f16\u8bd1\u5de5\u5177\uff1a<\/p>\n
\/\/-N \u7981\u6b62\u4f18\u5316 -l \u7981\u6b62\u5185\u8054 -S \u8f93\u51fa\u6c47\u7f16\ngo tool compile -S -N -l test.go\n\n"".main STEXT size=125 \n  \/\/MOVQ \u62f7\u8d1d8\u5b57\u8282\u6570\u636e\n  0x0026 00038 (test.go:6)  MOVQ  $1, "".arr+48(SP)\n  0x002f 00047 (test.go:6)  MOVQ  $2, "".arr+56(SP)\n  0x0038 00056 (test.go:6)  MOVQ  $3, "".arr+64(SP)\n  0x0041 00065 (test.go:6)  MOVQ  $4, "".arr+72(SP)\n  0x004a 00074 (test.go:6)  MOVQ  $5, "".arr+80(SP)\n  0x0053 00083 (test.go:6)  MOVQ  $6, "".arr+88(SP)\n  \/\/MOVUPS \u62f7\u8d1d16\u5b57\u8282\u6570\u7ec4\uff0c\u6570\u7ec46\u4e2a\u5143\u7d20\u62f7\u8d1d\u4e09\u6b21\n  0x005c 00092 (test.go:7)  MOVUPS  "".arr+48(SP), X0\n  0x0061 00097 (test.go:7)  MOVUPS  X0, (SP)\n  0x0065 00101 (test.go:7)  MOVUPS  "".arr+64(SP), X0\n  0x006a 00106 (test.go:7)  MOVUPS  X0, 16(SP)\n  0x006f 00111 (test.go:7)  MOVUPS  "".arr+80(SP), X0\n  0x0074 00116 (test.go:7)  MOVUPS  X0, 32(SP)\n  0x0079 00121 (test.go:7)  CALL  "".testArray(SB)\n  \u2026\u2026\n\n"".testArray STEXT nosplit \n  0x000f 00015 (test.go:11) SUBQ  $136, SP\n\n  0x0026 00038 (test.go:12) MOVQ  $0, "".arr+144(SP)\n  0x0032 00050 (test.go:13) MOVQ  $500, "".arr+184(SP)\n<\/code><\/pre>\n
  \u4e0d\u8981\u88ab\u6c47\u7f16\u4e24\u4e2a\u5b57\u5413\u5230\uff0c\u53ea\u8981\u4e86\u89e3\u865a\u62df\u5185\u5b58\u7ed3\u6784\uff08\u91cd\u70b9\u51fd\u6570\u6808\u6862\u7ed3\u6784\uff09\uff0c\u4e86\u89e3\u5bc4\u5b58\u5668\u6982\u5ff5\uff0c\u4e86\u89e3\u4e00\u4e9b\u5e38\u89c1\u6307\u4ee4\u542b\u4e49\uff0c\u4e0a\u9762\u903b\u8f91\u5c31\u975e\u5e38\u6e05\u695a\u4e86\u3002”CALL testArray”\u5c31\u662f\u51fd\u6570\u8c03\u7528\uff0c\u5176\u4e0a\u9762\u51e0\u6761\u6307\u4ee4\u5c31\u662f\u53c2\u6570\u51c6\u5907\uff0c\u53ef\u4ee5\u5f88\u660e\u663e\u770b\u5230\u53c2\u6570\u662f\u5bf9\u539f\u6570\u7ec4\u7684\u4e00\u4e2a\u62f7\u8d1d\u3002\u4e0a\u8ff0\u4e8b\u4f8b\u6808\u6862\u7ed3\u6784\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
\"\"<\/p>\n
\u5207\u7247<\/h2>\n
  \u5207\u7247\u53ef\u4ee5\u7406\u89e3\u4e3a\u52a8\u6001\u6570\u7ec4\uff0c\u57fa\u672c\u4f7f\u7528\u548c\u6570\u7ec4\u6bd4\u8f83\u7c7b\u4f3c\uff0c\u90fd\u662f\u8fde\u7eed\u5b58\u50a8\uff0c\u53ef\u4ee5\u6309\u4e0b\u6807\u8bbf\u95ee\uff1b\u52a8\u6001\u7684\u542b\u4e49\u662f\uff0c\u5207\u7247\u7684\u5bb9\u91cf\u662f\u53ef\u4ee5\u8c03\u6574\u7684\uff0c\u5f80\u5207\u7247\u8ffd\u52a0\u5143\u7d20\u65f6\uff0cGo\u8bed\u8a00\u5e95\u5c42\u5224\u65ad\u6570\u7ec4\u5bb9\u91cf\u662f\u5426\u8db3\u591f\uff0c\u5982\u679c\u4e0d\u591f\u5219\u89e6\u53d1\u6269\u5bb9\u64cd\u4f5c\u3002<\/p>\n
\u57fa\u672c\u64cd\u4f5c<\/h3>\n
  \u6211\u4eec\u5148\u770b\u4e00\u4e2a\u5c0f\u4e8b\u4f8b\uff0c\u4ee5\u6b64\u4e86\u89e3\u5207\u7247\u7684\u521d\u59cb\u5316\u3001\u8bbf\u95ee\u3001\u8ffd\u52a0\u5143\u7d20\u7b49\u57fa\u672c\u64cd\u4f5c\uff0c\u4ee5\u53ca\u5207\u7247\u7684\u957f\u5ea6\u4ee5\u53ca\u5bb9\u91cf\uff1a<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n  \/\/\u58f0\u660e\u5e76\u521d\u59cb\u5316\u5207\u7247\n  slice := []int{1,2,3}\n  slice[0] = 100\n  \/\/len\uff1a\u5207\u7247\u957f\u5ea6\uff0c\u5373\u5207\u7247\u5b58\u50a8\u4e86\u51e0\u4e2a\u5143\u7d20\uff1bcap\uff1a\u5207\u7247\u5bb9\u91cf\uff0c\u5373\u5207\u7247\u5e95\u5c42\u6570\u7ec4\u6700\u591a\u80fd\u5b58\u50a8\u5143\u7d20\u6570\u76ee\n  fmt.Println(len(slice), cap(slice), slice) \/\/\u4e0a\u8ff0\u58f0\u660e\u65b9\u5f0f\uff0c\u5207\u7247\u957f\u5ea6\/\u5bb9\u91cf\u90fd\u7b49\u4e8e3\uff1a 3 3 [100 2 3]\n\n  \/\/\u5f80\u5207\u7247\u8ffd\u52a0\u5143\u7d20\uff0c\u6ce8\u610f\u5207\u7247slice\u5bb9\u91cf\u662f3\uff0c\u6b64\u65f6\u8ffd\u52a0\u5143\u7d20\u4f1a\u89e6\u53d1\u6269\u5bb9\u64cd\u4f5c\n  slice = append(slice, 4)\n  fmt.Println(len(slice), cap(slice), slice) \/\/\u5207\u7247\u5df2\u7ecf\u6269\u5bb9\uff0c\u6b64\u65f6\u5bb9\u91cf\u662f6\uff08\u4e00\u822c\u6309\u53cc\u500d\u5bb9\u91cf\u6269\u5bb9\uff09\uff1a 4 6 [100 2 3 4]\n\n  \/\/\u5207\u7247\u7684\u5bb9\u91cf\u867d\u7136\u662f6\uff0c\u4f46\u957f\u5ea6\u662f4\uff0c\u8bbf\u95ee\u4e0b\u68075\u8d8a\u754c\n  \/\/slice[5] = 5 \/\/panic: runtime error: index out of range [5] with length 4\n\n  \/\/\u4e5f\u53ef\u4ee5\u57fa\u4e8emake\u51fd\u6570\u58f0\u660e\u5207\u7247\uff1b\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u5207\u7247\u957f\u5ea6\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u4e3a\u5207\u7247\u5bb9\u91cf\uff08\u53ef\u4ee5\u7701\u7565\uff0c\u9ed8\u8ba4\u5bb9\u91cf\u7b49\u4e8e\u957f\u5ea6\uff09\n  slice1 := make([]int, 4, 8)\n  slice1[1] = 1\n  slice1[2] = 2\n  fmt.Println(len(slice1), cap(slice1), slice1) \/\/4 8 [0 1 2 0]\n\n  \/\/\u5207\u7247\u904d\u5386\u8bbf\u95ee\n  for idx, v := range slice {\n    printSliceValue(idx, v)  \/\/printSliceValue\u81ea\u5df1\u968f\u4fbf\u5b9a\u4e49\u5c31\u884c\n  }\n}<\/code><\/pre>\n
  \u51fd\u6570len\u7528\u4e8e\u83b7\u53d6\u5207\u7247\u957f\u5ea6\uff0ccap\u7528\u4e8e\u83b7\u53d6\u5207\u7247\u5bb9\u91cf\uff1b\u5207\u7247\u957f\u5ea6\u6307\u5207\u7247\u5143\u7d20\u6570\u76ee\uff0c\u8bbf\u95ee\u4e0b\u6807\u6700\u5927\u4e3alen – 1\uff0c\u5207\u7247\u5bb9\u91cf\u6307\u5207\u7247\u5e95\u5c42\u6570\u7ec4\u6700\u591a\u80fd\u5b58\u50a8\u7684\u5143\u7d20\u6570\u76ee\uff1bappend\u51fd\u6570\u7528\u4e8e\u5f80\u5207\u7247\u8ffd\u52a0\u5143\u7d20\uff0c\u8be5\u51fd\u6570\u4f1a\u5224\u65ad\u5207\u7247\u5bb9\u91cf\uff0c\u5982\u679c\u5bb9\u91cf\u4e0d\u591f\u5219\u89e6\u53d1\u6269\u5bb9\u64cd\u4f5c\uff0c\u4e00\u822c\u6309\u7167\u5bb9\u91cf\u4e24\u500d\u6269\u5bb9\u3002make\u662fGo\u8bed\u8a00\u63d0\u4f9b\u7684\u53d8\u91cf\u521d\u59cb\u5316\u51fd\u6570\uff0c\u53ef\u7528\u4e8e\u521d\u59cb\u5316\u4e00\u4e9b\u5185\u7f6e\u7c7b\u578b\u53d8\u91cf\uff0c\u5982\u5207\u7247\uff0cmap\uff0c\u7ba1\u9053chan\u7b49\u3002<\/p>\n
  \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7for range\u65b9\u5f0f\u904d\u5386\u5207\u7247\uff0crange\u53ef\u4ee5\u83b7\u53d6\u5f53\u524d\u904d\u5386\u5143\u7d20\u7684\u7d22\u5f15\u4ee5\u53ca\u5143\u7d20\u503c\uff0c\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u904d\u5386\u8fc7\u7a0b\u4e2d\u4fee\u6539\u5143\u7d20\u503c\uff0c\u5207\u7247\u7684\u5143\u7d20\u4f1a\u4fee\u6539\u5417\uff1f\u5982\u4e0b\u9762\u7684\u4e8b\u4f8b\uff1a<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n  slice := make([]int, 10, 10)\n  for i := 0; i < 10; i ++ {\n    slice[i] = i\n  }\n\n  for idx, v := range slice {\n    v += 100\n    printSliceValue(idx, v)\n  }\n\n  fmt.Println(slice)   \/\/\u8f93\u51fa [0 1 2 3 4 5 6 7 8 9]\n}\n\nfunc printSliceValue(idx, val int) {\n  fmt.Println(idx, val)\n}<\/code><\/pre>\n
  \u663e\u800c\u6613\u89c1\uff0c\u8fd9\u4e48\u4fee\u6539\u5143\u7d20v\u7684\u503c\uff0c\u5207\u7247slice\u7684\u5143\u7d20\u4e0d\u4f1a\u6539\u53d8\u3002\u4e3a\u4ec0\u4e48\u5462\uff1f\u56e0\u4e3a\u8fd9\u91cc\u7d22\u5f15\u503cv\u53ea\u662f\u5207\u7247\u5143\u7d20\u7684\u4e00\u4e2a\u62f7\u8d1d\uff0c\u4fee\u6539\u526f\u672c\u503c\uff0c\u539f\u503c\u80af\u5b9a\u662f\u4e0d\u4f1a\u6539\u53d8\u7684\u3002\u90a3\u4e48\u60f3\u5728\u904d\u5386\u4e2d\u4fee\u6539\u5207\u7247\u7684\u503c\u600e\u4e48\u529e\uff1f\u53ef\u4ee5\u901a\u8fc7slice[idx]\u5f62\u5f0f\u4fee\u6539\uff0c\u8fd9\u6837\u8bbf\u95ee\u5230\u7684\u624d\u662f\u5207\u7247\u539f\u503c\u3002<\/p>\n
  \u5207\u7247\u8fd8\u6709\u4e00\u4e2a\u5e38\u89c1\u64cd\u4f5c\uff1a\u622a\u53d6\uff0c\u5373\u622a\u53d6\u8be5\u5207\u7247\u7684\u4e00\u90e8\u5206\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u5207\u7247\uff0c\u8bed\u6cd5\u683c\u5f0f\u4e3a”slice[start:end]”\uff0cstart\u4e0eend\u5747\u8868\u793a\u4e0b\u6807\uff0c\u5de6\u5f00\u53c8\u95ed\uff08\u65b0\u5207\u7247\u5305\u62ec\u4e0b\u6807start\u5143\u7d20\uff0c\u4e0d\u5305\u542b\u4e0b\u6807end\u5143\u7d20\uff09\uff0c\u65b0\u5207\u7247\u957f\u5ea6\u4e3aend – start\u3002<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n  slice := []int{1,2,3,4,5,6,7,8,9,10}\n  \/\/\u5207\u7247\u622a\u53d6\n  slice1 := slice[2:5]\n  \/\/\u4fee\u6539\u65b0\u5207\u7247slice1\u5143\u7d20\uff0cslice\u5143\u7d20\u4f1a\u6539\u53d8\u5417\uff1f\n  slice1[0] = 100\n  fmt.Println(len(slice), cap(slice), slice)\n  fmt.Println(len(slice1), cap(slice1), slice1)\n\n  \/\/slice1\u8ffd\u52a0\u591a\u4e2a\u5143\u7d20\uff0c\u8d85\u8fc7\u5176cap\u89e6\u53d1\u6269\u5bb9\n  slice1 = append(slice1, 11,12,13,14,15,16,17,18,19,20,21,22)\n  \/\/\u518d\u6b21\u4fee\u6539slice1\u5143\u7d20\uff0cslice\u5143\u7d20\u4f1a\u6539\u53d8\u5417\uff1f\n  slice1[0] = 200\n  fmt.Println(len(slice), cap(slice), slice)\n  fmt.Println(len(slice1), cap(slice1), slice1)\n}\n\n\/**\n\u8f93\u51fa\uff1a\n10 10 [1 2 100 4 5 6 7 8 9 10]\n3 8 [100 4 5]\n\n10 10 [1 2 100 4 5 6 7 8 9 10]\n15 16 [200 4 5 11 12 13 14 15 16 17 18 19 20 21 22]\n**\/<\/code><\/pre>\n
  \u5206\u6790\u8f93\u51fa\u7ed3\u6784\uff0c\u901a\u8fc7\u622a\u53d6\u751f\u6210\u65b0\u5207\u7247slice1\u4e4b\u540e\uff0c\u4fee\u6539slice1\u5143\u7d20\uff0cslice\u5143\u7d20\u7adf\u7136\u4e5f\u88ab\u6539\u53d8\u4e86\uff01\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f\u56e0\u4e3a\u5207\u7247\u5e95\u5c42\u4e5f\u662f\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\uff0c\u622a\u53d6\u540e\u4e24\u4e2a\u5207\u7247\u5171\u7528\u540c\u4e00\u4e2a\u5e95\u5c42\u6570\u7ec4\uff0c\u6240\u4ee5\u4fee\u6539\u5143\u7d20\u624d\u4f1a\u4e92\u76f8\u5f71\u54cd\u3002\u90a3\u4e3a\u4ec0\u4e48append\u89e6\u53d1\u6269\u5bb9\u4e4b\u540e\uff0c\u53c8\u4e0d\u5f71\u54cd\u4e86\u5462\uff1f\u56e0\u4e3a\u6269\u5bb9\u4f1a\u7533\u8bf7\u65b0\u7684\u6570\u7ec4\uff0c\u4e5f\u5c31\u662f\u8bf4slice1\u5e95\u5c42\u6570\u7ec4\u53d8\u4e86\uff0c\u4e0eslice\u5e95\u5c42\u6570\u7ec4\u5265\u79bb\u4e86\uff0c\u6b64\u65f6\u4fee\u6539\u5143\u7d20\u80af\u5b9a\u4e0d\u4f1a\u4e92\u76f8\u5f71\u54cd\u4e86\u3002<\/p>\n
  \u53e6\u5916\u6ce8\u610f\uff0cslice1 := slice[2:5]\u622a\u53d6\u5207\u7247\u540e\uff0cslice\u957f\u5ea6\u662f3\uff0c\u4f46\u662f\u5bb9\u91cf\u662f8\uff1b\u56e0\u4e3aslice1\u4e0eslice\u5171\u7528\u5e95\u5c42\u6570\u7ec4\uff0c\u800c\u5e95\u5c42\u6570\u7ec4\u6700\u5927\u5bb9\u91cf\u662f10\uff0c\u4f46\u662fslice1\u5374\u662f\u4ece\u5e95\u5c42\u6570\u7ec4\u7d22\u5f152\u5f00\u59cb\uff0c\u6240\u4ee5slice1\u7684\u5bb9\u91cf\u5c31\u662f10 – 2 = 8 \u4e86\u3002<\/p>\n
  \u6700\u540e\u6211\u4eec\u518d\u601d\u8003\u4e00\u4e2a\u95ee\u9898\uff0c\u524d\u9762\u6211\u4eec\u4ecb\u7ecd\u6570\u7ec4\u5728\u4f20\u9012\u7684\u65f6\u5019\u662f\u6309\u503c\u4f20\u9012\uff0c\u51fd\u6570\u5185\u90e8\u4fee\u6539\u6570\u7ec4\u5143\u7d20\uff0c\u8c03\u7528\u65b9\u6570\u7ec4\u5e76\u6ca1\u6709\u6539\u53d8\uff1f\u90a3\u4e48\u5207\u7247\u5462\uff1f\u6211\u4eec\u9700\u8981\u7262\u8bb0\u4e00\u70b9\uff0cGo\u8bed\u8a00\u4f20\u53c2\u90fd\u662f\u6309\u503c\u4f20\u9012\u7684\uff1f\u90a3\u5c31\u662f\u4e86\uff0c\u5207\u7247\u548c\u6570\u7ec4\u4e00\u6837\uff0c\u4e5f\u4e0d\u4f1a\u6539\u53d8\u3002\u662f\u8fd9\u6837\u5417\uff1f\u6211\u4eec\u7528\u4e00\u4e2a\u5c0f\u4e8b\u4f8b\u9a8c\u8bc1\u4e0b\uff1a<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n  slice := make([]int, 2, 10)\n  slice[0] = 1\n  slice[1] = 2\n  fmt.Println(len(slice), cap(slice), slice)   \/\/\u521d\u59cb\u5207\u7247\u957f\u5ea62\uff0c\u5bb9\u91cf10\uff1a2 10 [1 2]\n\n  testSlice(slice)\n  fmt.Println(len(slice), cap(slice), slice)   \/\/\u5207\u7247\u957f\u5ea6\u5bb9\u91cf\u90fd\u6ca1\u6709\u6539\u53d8\uff0c\u4f46\u662f\u5207\u7247\u5143\u7d20\u6539\u53d8\u4e86\uff1a2 10 [100 200]\n}\n\nfunc testSlice(slice []int) {\n  slice[0] = 100\n  slice[1] = 200\n  slice = append(slice, 300)\n  fmt.Println(len(slice), cap(slice), slice) \/\/\u4fee\u6539\u5207\u7247\u5143\u7d20\uff0c\u5e76\u8ffd\u52a0\u4e00\u4e2a\u5143\u7d20\uff0c\u5207\u7247\u957f\u5ea63\uff0c\u5bb9\u91cf10\uff1a3 10 [100 200 300]\n}<\/code><\/pre>\n
  \u8c8c\u4f3c\u548c\u731c\u60f3\u7684\u4e0d\u4e00\u6837\u554a\uff0ctestSlice\u51fd\u6570\u4e2d\u4fee\u6539\u4e86\u5207\u7247\u5143\u7d20\uff0cmain\u51fd\u6570\u4e2dslice\u5207\u7247\u5143\u7d20\u4e5f\u540c\u6b65\u6539\u53d8\u4e86\uff1b\u800ctestSlice\u51fd\u6570\u8ffd\u52a0\u5143\u7d20\uff0c\u6539\u53d8\u4e86\u5207\u7247\u957f\u5ea6\uff0c\u4f46\u662fmain\u51fd\u6570\u4e2dslice\u5207\u7247\u957f\u5ea6\u5374\u6ca1\u6709\u6539\u53d8\u3002why\uff1fGo\u8bed\u8a00\u4f20\u53c2\u5230\u5e95\u662f\u4f20\u503c\u8fd8\u662f\u4f20\u5f15\u7528\u5462\uff1fGo\u8bed\u8a00\u786e\u5b9e\u662f\u6309\u503c\u4f20\u53c2\u7684\u3002\u957f\u5ea6\u548c\u5bb9\u91cf\u90fd\u662f\u5207\u7247\u7684\u503c\uff0c\u6240\u4ee5\u5373\u4f7ftestSlice\u51fd\u6570\u4fee\u6539\u4e86main\u51fd\u6570\u4e2d\u4e5f\u4e0d\u4f1a\u6539\u53d8\uff0c\u4f46\u662f\u5e95\u5c42\u6570\u7ec4\u5374\u662f\u5171\u7528\u7684\uff0ctestSlice\u51fd\u6570\u4fee\u6539\u4e86main\u51fd\u6570\u4e2d\u4f1a\u540c\u6b65\u4fee\u6539\u3002<\/p>\n
  \u770b\u5230\u8fd9\u91cc\u53ef\u80fd\u4f60\u8fd8\u662f\u6709\u4e9b\u8ff7\u60d1\uff0c\u4e0d\u7528\u62c5\u5fc3\uff0c\u5b66\u4e60\u4e0b\u4e00\u5c0f\u8282\u5207\u7247\u5b9e\u73b0\u539f\u7406\u4e4b\u540e\uff0c\u76f8\u4fe1\u4f60\u4f1a\u604d\u7136\u5927\u609f\u3002<\/p>\n
\u5b9e\u73b0\u539f\u7406<\/h3>\n
  \u6211\u4eec\u4e00\u76f4\u8bf4\u5207\u7247\u5c31\u662f\u52a8\u6001\u6570\u7ec4\uff0c\u8fd9\u662f\u600e\u4e48\u505a\u5230\u52a8\u6001\u7684\u5462\uff1f\u90fd\u77e5\u9053\u6570\u7ec4\u662f\u8fde\u7eed\u5185\u5b58\u5b58\u50a8\u7684\uff0c\u6240\u4ee5\u60f3\u8ffd\u52a0\u5143\u7d20\u975e\u5e38\u9ebb\u70e6\uff0c\u9700\u8981\u7533\u8bf7\u66f4\u5927\u7684\u8fde\u7eed\u5185\u5b58\u7a7a\u95f4\uff0c\u62f7\u8d1d\u6240\u6709\u6570\u7ec4\u5143\u7d20\uff0c\u6027\u80fd\u975e\u5e38\u5927\u3002\u5207\u7247\u4e5f\u662f\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\u7684\uff0c\u53ea\u4e0d\u8fc7\u91c7\u53d6\u9884\u5206\u914d\u7b56\u7565\uff0c\u4e00\u822c\u5207\u7247\u7684\u5bb9\u91cf\u90fd\u6bd4\u5207\u7247\u957f\u5ea6\u5927\uff0c\u8fd9\u6837\u518d\u5f80\u5207\u7247\u8ffd\u52a0\u5143\u7d20\u65f6\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u5185\u5b58\u5206\u914d\u4ee5\u53ca\u6570\u636e\u62f7\u8d1d\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u5207\u7247\u4e5f\u9700\u8981\u8bb0\u5f55\u66f4\u591a\u7684\u4fe1\u606f\uff1a\u5982\u6570\u7ec4\u9996\u5730\u5740\uff0c\u7528\u4e8e\u5b58\u50a8\u5143\u7d20\uff1b\u5bb9\u91cf\uff0c\u8bb0\u5f55\u5e95\u5c42\u6570\u7ec4\u6700\u591a\u53ef\u4ee5\u5b58\u50a8\u7684\u5143\u7d20\u6570\u76ee\uff1b\u957f\u5ea6\uff0c\u8bb0\u5f55\u5df2\u7ecf\u5b58\u50a8\u7684\u5143\u7d20\u6570\u76ee\u3002\u5bb9\u91cf\u51cf\u957f\u5ea6\uff0c\u5c31\u662f\u6570\u7ec4\u5269\u4f59\u957f\u5ea6\u4e86\uff0c\u5373\u8be5\u5207\u7247\u5728\u89e6\u53d1\u6269\u5bb9\u4e4b\u524d\uff0c\u8fd8\u80fd\u8ffd\u52a0\u7684\u5143\u7d20\u6570\u76ee\u3002<\/p>\n
  \u5207\u7247\u7684\u5b9a\u4e49\u5728runtime\/slice.go\u6587\u4ef6\uff0c\u5982\u4e0b\uff1a<\/p>\n
type slice struct {\n  array unsafe.Pointer\n  len   int\n  cap   int\n}<\/code><\/pre>\n
  \u548c\u6211\u4eec\u731c\u6d4b\u7684\u4e00\u6837\uff0c\u5207\u7247\u5305\u542b\u4e09\u4e2a\u5b57\u6bb5\uff0c\u5176\u5b9earray\u662f\u4e00\u4e2a\u6307\u9488\uff0c\u6307\u5411\u5e95\u5c42\u6570\u7ec4\u6536\u5730\u5740\u3002\u8be5\u6587\u4ef6\u8fd8\u5b9a\u4e49\u4e86\u4e00\u4e9b\u5e38\u7528\u7684\u5207\u7247\u64cd\u4f5c\u51fd\u6570\uff1a<\/p>\n
\/\/make\u521b\u5efa\u5207\u7247\u5e95\u5c42\u5b9e\u73b0\nfunc makeslice(et *_type, len, cap int) unsafe.Pointer\n\/\/\u5207\u7247\u8ffd\u52a0\u5143\u7d20\u65f6\uff0c\u5bb9\u91cf\u4e0d\u8db3\u6269\u5bb9\u5b9e\u73b0\u65b9\u6cd5\nfunc growslice(et *_type, old slice, cap int) slice\n\/\/\u5207\u7247\u6570\u636e\u62f7\u8d1d\nfunc slicecopy(toPtr unsafe.Pointer, toLen int, fromPtr unsafe.Pointer, fromLen int, width uintptr) int<\/code><\/pre>\n
  \u5f53\u6211\u4eec\u4f7f\u7528make\u51fd\u6570\u521b\u5efa\u5207\u7247\u7c7b\u578b\u65f6\uff0c\u5e95\u5c42\u5c31\u662f\u8c03\u7528makeslice\u51fd\u6570\u5206\u914d\u6570\u7ec4\uff0c\u5176\u4e2d\u7b2c\u4e00\u4e2a\u53c2\u6570type\u8868\u793a\u5207\u7247\u5b58\u50a8\u7684\u5143\u7d20\u7c7b\u578b\uff0c\u56e0\u6b64\u6570\u7ec4\u6240\u9700\u5185\u5b58\u5927\u5c0f\u5e94\u8be5\u662f\u5143\u7d20\u5927\u5c0f\u4e58\u6570\u7ec4\u5bb9\u91cf\u3002makeslice\u51fd\u6570\u5b9e\u73b0\u975e\u5e38\u7b80\u5355\uff0c\u5982\u4e0b\uff1a<\/p>\n
func makeslice(et *_type, len, cap int) unsafe.Pointer {\n  \/\/math.MulUintptr\u8fd4\u56dea * b\uff0c\u540c\u65f6\u5224\u65ad\u662f\u5426\u53d1\u751f\u6ea2\u51fa\n  mem, overflow := math.MulUintptr(et.size, uintptr(cap))\n  \n  \/\/\u7701\u7565\u4e86\u4e00\u4e9b\u53c2\u6570\u6821\u9a8c\u903b\u8f91\n\n  return mallocgc(mem, et, true) \/\/mallocgc\u51fd\u6570\u7528\u4e8e\u5206\u914d\u5185\u5b58\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u8868\u793a\u662f\u5426\u521d\u59cb\u5316\u5185\u5b58\u4e3a\u5168\u96f6\n}<\/code><\/pre>\n
  \u51fd\u6570makeslice\u597d\u50cf\u53ea\u662f\u7533\u8bf7\u4e86\u5207\u7247\u5e95\u5c42\u6570\u7ec4\u5185\u5b58\uff0c\u90a3\u4e48\u7ed3\u6784\u4f53slice\u4e2d\u7684\u5176\u4ed6\u5b57\u6bb5\u5462\uff1f\u600e\u4e48\u7ef4\u62a4\u5462\uff1f\u51fd\u6570\u53c2\u6570\u4f20\u9012\u5207\u7247\u65f6\uff0c\u4f20\u9012\u7684\u5230\u5e95\u662f\u4ec0\u4e48\u5462\uff1f\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u5206\u6790\u6c47\u7f16\u4ee3\u7801\u4e86\u3002Go\u7a0b\u5e8f\u5982\u4e0b\uff1a<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n  slice := make([]int, 4, 10)\n  slice[0] = 100\n  printInt(len(slice))\n  printInt(cap(slice))\n\n  testSlice(slice)\n}\n\nfunc printInt(a int) {\n  fmt.Println(a)\n}\n\nfunc testSlice(slice []int) {\n  fmt.Println(slice)\n}\n<\/code><\/pre>\n
  \u7f16\u8bd1\u540e\u7684\u6c47\u7f16\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
"".main STEXT size=153\n  \/\/makeslice\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u7c7b\u578b\u6307\u9488\uff0c\u8fd9\u91cc\u5c31\u662ftype.int\n  0x0018 00024 (test.go:6)  LEAQ  type.int(SB), AX\n  \/\/\u51c6\u5907\u7b2c\u4e8c\u4e2a\u53c2\u6570\n  0x001f 00031 (test.go:6)  MOVL  $4, BX\n  \/\/\u51c6\u5907\u7b2c\u4e09\u4e2a\u53c2\u6570\n  0x0024 00036 (test.go:6)  MOVL  $10, CX\n  \/\/\u51fd\u6570\u8c03\u7528\uff1b\u51fd\u6570\u8fd4\u56de\u503c\u5373\u6570\u7ec4\u9996\u5730\u5740\uff0c\u5728AX\u5bc4\u5b58\u5668\n  0x0029 00041 (test.go:6)  CALL  runtime.makeslice(SB)\n  \/\/\u4e0b\u9762\u4e09\u884c\u6c47\u7f16\u662f\u6784\u9020slice\u7ed3\u6784\uff1a\u6570\u7ec4\u9996\u5730\u5740 + len + cap\n  0x002e 00046 (test.go:6)  MOVQ  AX, "".slice+32(SP)\n  0x0033 00051 (test.go:6)  MOVQ  $4, "".slice+40(SP)\n  0x003c 00060 (test.go:6)  MOVQ  $10, "".slice+48(SP)\n\n  \/\/AX\u5bc4\u5b58\u5668\u5b58\u50a8\u6570\u7ec4\u9996\u5730\u5740\uff0c\u5373\u8d4b\u503cslice[0] = 100\n  0x0047 00071 (test.go:7)  MOVQ  $100, (AX)\n\n  \/\/+40(SP)\u5373\u5207\u7247\u7684len\uff0c\u62f7\u8d1d\u5230AX\u5bc4\u5b58\u5668\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\n  0x004e 00078 (test.go:8)  MOVQ  "".slice+40(SP), AX\n  0x0053 00083 (test.go:8)  MOVQ  AX, ""..autotmp_1+24(SP)\n  0x0058 00088 (test.go:8)  CALL  "".printInt(SB)\n\n  \/\/+48(SP)\u5373\u5207\u7247\u7684cap\uff0c\u62f7\u8d1d\u5230AX\u5bc4\u5b58\u5668\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\n  0x005d 00093 (test.go:9)  MOVQ  "".slice+48(SP), AX\n  0x0062 00098 (test.go:9)  MOVQ  AX, ""..autotmp_1+24(SP)\n  0x0067 00103 (test.go:9)  CALL  "".printInt(SB)\n\n  \/\/\u62f7\u8d1dslice\u7ed3\u6784\uff1a\u6570\u7ec4\u9996\u5730\u5740 + len + cap\uff0c\u6784\u9020\u51fd\u6570testSlice\u8f93\u5165\u53c2\u6570\n  0x006c 00108 (test.go:11) MOVQ  "".slice+32(SP), AX\n  0x0071 00113 (test.go:11) MOVQ  "".slice+40(SP), BX\n  0x0076 00118 (test.go:11) MOVQ  "".slice+48(SP), CX\n  0x0080 00128 (test.go:11) CALL  "".testSlice(SB)<\/code><\/pre>\n
  \u51fd\u6570\u8f93\u5165\u53c2\u6570\u53ef\u4ee5\u5728\u6808\u4e0a\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5bc4\u5b58\u5668\u4f20\u9012\u8f93\u5165\u53c2\u6570\uff0c\u6bd4\u5982\u4e0a\u8ff0\u4ee3\u7801\uff0cAX\u662f\u7b2c\u4e00\u4e2a\u8f93\u5165\u53c2\u6570\uff0cBX\u3001CX\u4f9d\u6b21\u662f\u7b2c\u4e8c\u4e2a\u3001\u7b2c\u4e09\u4e2a\u8f93\u5165\u53c2\u6570\uff1b\u51fd\u6570\u8fd4\u56de\u503c\u4e5f\u662f\u65e2\u53ef\u4ee5\u5728\u6808\u4e0a\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5bc4\u5b58\u5668\uff0c\u4e0a\u9762\u4ee3\u7801\u4f7f\u7528AX\u5bc4\u5b58\u5668\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u8fd4\u56de\u503c\u3002<\/p>\n
  \u6bd5\u7adfslice\u7ed3\u6784\u975e\u5e38\u7b80\u5355\u660e\u4e86\uff0c\u4e09\u4e2a8\u5b57\u8282\uff0c\u6570\u7ec4\u9996\u5730\u5740 + len + cap\uff0c\u6240\u4ee5\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u901a\u8fc7\u6c47\u7f16\u4ee3\u7801\u6784\u9020\u3002\u800clen(slice)\u83b7\u53d6\u5207\u7247\u957f\u5ea6\uff0ccap(slice)\u83b7\u53d6\u5207\u7247\u5bb9\u91cf\u66f4\u662f\u7b80\u5355\uff0cslice\u5730\u5740\u504f\u79fb8\u5b57\u8282\u300116\u5b57\u8282\u5c31\u662f\u4e86\u3002<\/p>\n
  \u53e6\u5916\u6ce8\u610ftestSlice\u51fd\u6570\u8c03\u7528\uff0c\u62f7\u8d1d\u4e86slice\u7ed3\u6784\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570\uff0c\u5e95\u5c42\u6570\u7ec4\u5462\uff1f\u80af\u5b9a\u8fd8\u662f\u5171\u7528\u7684\uff0c\u6240\u4ee5\u5728\u51fd\u6570testSlice\u5185\u90e8\u4fee\u6539\u4e86\u5207\u7247\u5143\u7d20\uff0c\u8c03\u7528\u65b9\u4e5f\u4f1a\u540c\u6b65\u4fee\u6539\uff1b\u800c\u5728\u51fd\u6570testSlice\u5185\u90e8append\u89e6\u53d1\u7684\u6269\u5bb9\uff0c\u5374\u4e0d\u56de\u5f71\u54cd\u8c03\u7528\u65b9\u5207\u7247\u7684len\u4ee5\u53cacap\u3002\u8fd9\u4e5f\u89e3\u51b3\u4e86\u6211\u4eec\u4e0a\u4e00\u5c0f\u8282\u7559\u4e0b\u7684\u4e00\u4e9b\u7591\u60d1\u3002<\/p>\n
  \u4e0a\u8ff0\u4e8b\u4f8b\u793a\u610f\u56fe\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
\"\"<\/p>\n
\u6269\u5bb9<\/h3>\n
  append\u7528\u4e8e\u5f80\u5207\u7247\u8ffd\u52a0\u5143\u7d20\uff0c\u5176\u5e95\u5c42\u5b9e\u73b0\u4f1a\u5224\u65ad\u5207\u7247\u5bb9\u91cf\uff0c\u5982\u679c\u5bb9\u91cf\u4e0d\u8db3\uff0c\u5219\u89e6\u53d1\u6269\u5bb9\u3002append\u901a\u5e38\u6709\u4e24\u79cd\u5199\u6cd5\uff1a1\uff09\u8ffd\u52a0\u4e00\u4e2a\u5207\u7247\u5230\u53e6\u4e00\u4e2a\u5207\u7247\uff1b2\uff09\u8ffd\u52a0\u5143\u7d20\u5230\u4e00\u4e2a\u5207\u7247\u3002\u5982\u4e0b\u9762\u4e8b\u4f8b\u6240\u793a\uff1a<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n  slice := make([]int, 0, 100)\n  slice = append(slice, 10, 20, 30)\n\n  slice1 := []int{1, 2, 3}\n  slice = append(slice, slice1...)\n  \n  fmt.Println(slice,slice1) \/\/[10 20 30 1 2 3] [1 2 3]\n}<\/code><\/pre>\n
  append\u51fd\u6570\u5b9e\u73b0\u5728\u54ea\u5462\uff1f\u5982\u679c\u4f60\u67e5\u770bruntime\/slice.go\u6587\u4ef6\uff0c\u4f1a\u53d1\u73b0\u597d\u50cf\u6ca1\u6709appendslice\u51fd\u6570\uff0c\u5012\u662f\u6709growslice\u5207\u7247\u6269\u5bb9\u7684\u5b9e\u73b0\u3002append\u51fd\u6570\u5176\u5b9e\u662f\u7f16\u8bd1\u9636\u6bb5\u751f\u6210\u7684\uff0c\u5e76\u6ca1\u6709\u6e90\u7801\uff0c\u8fd9\u91cc\u76f4\u63a5\u7ed9\u51fa\u4e24\u79cd\u5199\u6cd5\u4e0b\u7684\u6838\u5fc3\u903b\u8f91\uff1a<\/p>\n
\/\/\u53c2\u80031\uff1acmd\/compile\/internal\/walk\/assign.go:appendSlice\n\/\/\u53c2\u80032\uff1acmd\/compile\/internal\/walk\/builtin.go:walkAppend\n\n\/\/ expand append(l1, l2...) to\n\/\/   init {\n\/\/     s := l1\n\/\/     n := len(s) + len(l2)\n\/\/     \/\/ Compare as uint so growslice can panic on overflow.\n\/\/     if uint(n) > uint(cap(s)) {\n\/\/       s = growslice(s, n)\n\/\/     }\n\/\/     s = s[:n]\n\/\/     memmove(&s[len(l1)], &l2[0], len(l2)*sizeof(T))\n\/\/   }\n\n\n\/\/ Rewrite append(src, x, y, z) \n\/\/   init {\n\/\/     s := src\n\/\/     const argc = len(args) - 1\n\/\/     if cap(s) - len(s) < argc {\n\/\/      s = growslice(s, len(s)+argc)\n\/\/     }\n\/\/     n := len(s)\n\/\/     s = s[:n+argc]\n\/\/     s[n] = a\n\/\/     s[n+1] = b\n\/\/     ...\n\/\/   }<\/code><\/pre>\n
  \u53ef\u4ee5\u770b\u5230\uff0c\u5728\u5bb9\u91cf\u4e0d\u8db3\u65f6\uff0c\u90fd\u662f\u901a\u8fc7growslice\u6765\u6269\u5bb9\u7684\u3002\u51fd\u6570growslice\u5728\u5207\u7247\u5bb9\u91cf\u8f83\u5c0f\u65f6\uff0c\u6309\u7167\u4e24\u500d\u6269\u5bb9\uff1b\u5207\u7247\u5bb9\u91cf\u8f83\u5927\u65f6\uff0c\u6269\u5bb925%\u3002\u786e\u5b9a\u5207\u7247\u5bb9\u91cf\u540e\uff0c\u5c31\u662f\u7533\u8bf7\u5185\u5b58\uff0c\u540c\u65f6\u62f7\u8d1d\u5207\u7247\u6570\u636e\u5230\u65b0\u6570\u7ec4\u3002\u6709\u5174\u8da3\u7684\u8bfb\u8005\u53ef\u4ee5\u7814\u7a76\u4e0bgrowslice\u51fd\u6570\u7684\u6e90\u7801\u3002<\/p>\n
\u62f7\u8d1d<\/h3>\n
  \u6700\u540e\u6211\u4eec\u518d\u63a2\u7d22\u4e00\u4e2a\u95ee\u9898\uff1a\u4e0d\u7ba1\u662f\u5207\u7247\u7684\u622a\u53d6\uff0c\u4f20\u53c2\u7b49\uff0c\u5e95\u5c42\u6570\u7ec4\u521d\u59cb\u90fd\u662f\u5171\u7528\u7684\uff0c\u4fee\u6539\u4e00\u4e2a\u5207\u7247\u7684\u5143\u7d20\u5fc5\u7136\u5f71\u54cd\u53e6\u4e00\u4e2a\u5207\u7247\uff0c\u6709\u6ca1\u6709\u529e\u6cd5\u5b9e\u73b0\u5207\u7247\u7684\u5b8c\u5168\u62f7\u8d1d\u5462\uff1f\u62f7\u8d1d\u540e\u4e24\u4e2a\u5207\u7247\u6570\u7ec4\u4e5f\u662f\u9694\u79bb\u7684\uff0c\u4e92\u4e0d\u5f71\u54cd\u3002\u8fd9\u79cd\u5b8c\u5168\u62f7\u8d1d\u53ef\u4ee5\u57fa\u4e8eGo\u8bed\u8a00\u5185\u7f6e\u51fd\u6570copy\u5b9e\u73b0\uff1a<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n  slice := []int{1,2,3,4,5}\n  slice1 := make([]int, len(slice), 10)\n  copy(slice1, slice)\n\n  slice1[0] = 100\n  fmt.Println(slice, slice1)\n}\n\n\/**\n  [1 2 3 4 5] [100 2 3 4 5]\n**\/<\/code><\/pre>\n
  \u53ef\u4ee5\u770b\u5230\uff0c\u4fee\u6539\u5207\u7247slice1\u5143\u7d20\u4e4b\u540e\uff0cslice\u5207\u7247\u5143\u7d20\u6ca1\u6709\u53d1\u751f\u6539\u53d8\u3002\u8fd9\u91cc\u53c8\u6709\u7591\u95ee\u4e86\uff0ccopy\u51fd\u6570\u7684\u5b9e\u73b0\u903b\u8f91\u662f\u600e\u6837\u7684\u5462\uff1f\u662fruntime\/slice.go\u6587\u4ef6\u4e2d\u7684slicecopy\u51fd\u6570\u5417\uff1f\u53ea\u80fd\u8bf4\u4e0d\u5b8c\u5168\u662f\uff0cGo\u8bed\u8a00\u5728\u7f16\u8bd1\u9636\u6bb5\u5224\u65ad\uff0c\u5982\u679c\u5207\u7247\u5143\u7d20\u7c7b\u578b\u5305\u62ec\u6307\u9488\uff0c\u5219copy\u5bf9\u5e94typedslicecopy\u51fd\u6570\uff1b\u5982\u679c\u9700\u8981\u4e00\u4e9b\u8fd0\u884c\u65f6\u53d8\u91cf\uff0c\u5219copy\u5bf9\u5e94slicecopy\u51fd\u6570\uff1b\u5426\u5219\u7f16\u8bd1\u9636\u6bb5\u76f4\u63a5\u751f\u6210\u6c47\u7f16\u4ee3\u7801\uff0c\u8fd9\u91cc\u76f4\u63a5\u7ed9\u51fa\u8be5\u6c47\u7f16\u4ee3\u7801\u7684\u6838\u5fc3\u903b\u8f91\uff1a<\/p>\n
\/\/\u53c2\u8003\uff1acmd\/compile\/internal\/walk\/builtin.go:walkCopy\n\n\/\/ Lower copy(a, b) to a memmove call or a runtime call.\n\/\/\n\/\/ init {\n\/\/   n := len(a)\n\/\/   if n > len(b) { n = len(b) }\n\/\/   if a.ptr != b.ptr { memmove(a.ptr, b.ptr, n*sizeof(elem(a))) }\n\/\/ }<\/code><\/pre>\n
\u603b\u7ed3<\/h2>\n
  \u5230\u8fd9\u91cc\u6570\u7ec4\u548c\u5207\u7247\u7684\u57fa\u672c\u4e0a\u7b97\u662f\u8bb2\u89e3\u5b8c\u6bd5\u4e86\uff0c\u662f\u4e0d\u662f\u6ca1\u60f3\u5230\u7adf\u7136\u6709\u8fd9\u4e48\u591a\u7ec6\u8282\u70b9\u9700\u8981\u6ce8\u610f\u3002\u6570\u7ec4\u7684\u6309\u503c\u4f20\u53c2\u4e00\u5b9a\u8981\u8bb0\u5f97\uff0c\u5207\u7247\u7684slice\u7ed3\u6784\u5b9a\u4e49\u4e00\u5b9a\u8981\u6e05\u695a\uff0c\u7ed3\u5408\u8be5\u7ed3\u6784\u5b9a\u4e49\uff0c\u601d\u8003\u5207\u7247\u7684\u622a\u53d6\uff0c\u4f20\u53c2\uff0c\u6269\u5bb9\u7b49\u73b0\u8c61\uff0c\u5e94\u8be5\u5c31\u6bd4\u8f83\u597d\u7406\u89e3\u4e86\u3002<\/p>\n
https:\/\/segmentfault.com\/a\/1190000042475829<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
  \u6570\u7ec4\u548c\u5207\u7247\u662fGo\u8bed\u8a00\u63d0\u4f9b\u7684\u4e24\u79cd\u57fa\u672c\u6570\u636e\u7ed3\u6784\uff0c\u6570\u7ec4\u7684\u6982\u5ff5\u5927\u5bb6\u5e94\u8be5\u90fd\u5f88\u719f\u6089\uff0c\u76f8\u540c\u7c7b\u578b\u5143\u7d20\u7684 […]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-10006472","post","type-post","status-publish","format-standard","hentry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006472","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006472"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006472\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006472"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006472"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}