{"id":637,"date":"2019-12-24T17:01:54","date_gmt":"2019-12-24T09:01:54","guid":{"rendered":"http:\/\/blog.xrhoujie.com\/?p=637"},"modified":"2019-11-24T17:03:23","modified_gmt":"2019-11-24T09:03:23","slug":"%e3%80%90js%e3%80%91%e6%b7%b1%e6%8b%b7%e8%b4%9d%e4%b8%8e%e6%b5%85%e6%8b%b7%e8%b4%9d%e7%9a%84%e5%8c%ba%e5%88%ab%ef%bc%8c%e5%ae%9e%e7%8e%b0%e6%b7%b1%e6%8b%b7%e8%b4%9d%e7%9a%84%e5%87%a0%e7%a7%8d%e6%96%b9","status":"publish","type":"post","link":"http:\/\/blog.xrhoujie.com\/?p=637","title":{"rendered":"\u3010JS\u3011\u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d\u7684\u533a\u522b\uff0c\u5b9e\u73b0\u6df1\u62f7\u8d1d\u7684\u51e0\u79cd\u65b9\u6cd5(\u8f6c)"},"content":{"rendered":"

\u5982\u4f55\u533a\u5206\u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d\uff0c\u7b80\u5355\u70b9\u6765\u8bf4\uff0c\u5c31\u662f\u5047\u8bbeB\u590d\u5236\u4e86A\uff0c\u5f53\u4fee\u6539A\u65f6\uff0c\u770bB\u662f\u5426\u4f1a\u53d1\u751f\u53d8\u5316\uff0c\u5982\u679cB\u4e5f\u8ddf\u7740\u53d8\u4e86\uff0c\u8bf4\u660e\u8fd9\u662f\u6d45\u62f7\u8d1d\uff0c\u62ff\u4eba\u624b\u77ed\uff0c\u5982\u679cB\u6ca1\u53d8\uff0c\u90a3\u5c31\u662f\u6df1\u62f7\u8d1d\uff0c\u81ea\u98df\u5176\u529b\u3002<\/p>\n

\u6b64\u7bc7\u6587\u7ae0\u4e2d\u4e5f\u4f1a\u7b80\u5355\u9610\u8ff0\u5230\u6808\u5806<\/strong>\uff0c\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/strong>\u4e0e\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/strong>\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u6982\u5ff5\u80fd\u66f4\u597d\u7684\u8ba9\u4f60\u7406\u89e3\u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d\u3002<\/p>\n

\u6211\u4eec\u6765\u4e3e\u4e2a\u6d45\u62f7\u8d1d\u4f8b\u5b50\uff1a<\/p>\n

\n
let a=[0,1,2,3,4],\r\n    b=a;\r\nconsole.log(a===b);\r\na[0]=1;\r\nconsole.log(a,b);<\/strong><\/pre>\n<\/div>\n
\"\"<\/p>\n
\u55ef\uff1f\u660e\u660eb\u590d\u5236\u4e86a\uff0c\u4e3a\u5565\u4fee\u6539\u6570\u7ec4a\uff0c\u6570\u7ec4b\u4e5f\u8ddf\u7740\u53d8\u4e86\uff0c\u8fd9\u91cc\u6211\u4e0d\u7981\u9677\u5165\u4e86\u6c89\u601d\u3002<\/p>\n
\"\"<\/p>\n
\u90a3\u4e48\u8fd9\u91cc\uff0c\u5c31\u5f97\u5f15\u5165\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e0e\u5f15\u7528\u6570\u636e\u7c7b\u578b\u7684\u6982\u5ff5\u4e86\u3002<\/p>\n
\u00a0\u8d30 \u2740 \u57fa\u672c\u6570\u636e\u4e0e\u590d\u6742(\u5f15\u7528)\u6570\u636e<\/strong><\/p>\n
\u9762\u8bd5\u5e38\u95ee\uff0c\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6709\u54ea\u4e9b\uff0cnumber\uff0cstring\uff0cboolean\uff0cnull\uff0cundefined\uff0csymbol<\/strong>\u4ee5\u53ca\u672a\u6765ES10\u65b0\u589e\u7684BigInt<\/strong>(\u4efb\u610f\u7cbe\u5ea6\u6574\u6570)\u4e03\u7c7b\u3002<\/p>\n
\u5f15\u7528\u6570\u636e\u7c7b\u578b(Object\u7c7b)\u6709\u5e38\u89c4\u540d\u503c\u5bf9\u7684\u65e0\u5e8f\u5bf9\u8c61{a:1}\uff0c\u6570\u7ec4[1,2,3]\uff0c\u4ee5\u53ca\u51fd\u6570\u7b49\u3002<\/p>\n
\u800c\u8fd9\u4e24\u7c7b\u6570\u636e\u5b58\u50a8\u5206\u522b\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
a.\u57fa\u672c\u7c7b\u578b–\u540d\u503c\u5b58\u50a8\u5728\u6808\u5185\u5b58\u4e2d<\/strong>\uff0c\u4f8b\u5982let a=1;<\/p>\n
\"\"<\/p>\n
\u5f53\u4f60b=a\u590d\u5236\u65f6\uff0c\u6808\u5185\u5b58\u4f1a\u65b0\u5f00\u8f9f\u4e00\u4e2a\u5185\u5b58\uff0c\u4f8b\u5982\u8fd9\u6837\uff1a<\/p>\n
\"\"<\/p>\n
\u6240\u4ee5\u5f53\u4f60\u6b64\u65f6\u4fee\u6539a=2\uff0c\u5bf9b\u5e76\u4e0d\u4f1a\u9020\u6210\u5f71\u54cd\uff0c\u56e0\u4e3a\u6b64\u65f6\u7684b\u5df2\u81ea\u98df\u5176\u529b\uff0c\u7fc5\u8180\u786c\u4e86\uff0c\u4e0d\u53d7a\u7684\u5f71\u54cd\u4e86\u3002\u5f53\u7136\uff0clet a=1,b=a;\u867d\u7136b\u4e0d\u53d7a\u5f71\u54cd\uff0c\u4f46\u8fd9\u4e5f\u7b97\u4e0d\u4e0a\u6df1\u62f7\u8d1d\uff0c\u56e0\u4e3a\u6df1\u62f7\u8d1d\u672c\u8eab\u53ea\u9488\u5bf9\u8f83\u4e3a\u590d\u6742\u7684object\u7c7b\u578b\u6570\u636e\u3002<\/p>\n
b.\u5f15\u7528\u6570\u636e\u7c7b\u578b–\u540d\u5b58\u5728\u6808\u5185\u5b58\u4e2d\uff0c\u503c\u5b58\u5728\u4e8e\u5806\u5185\u5b58\u4e2d\uff0c\u4f46\u662f\u6808\u5185\u5b58\u4f1a\u63d0\u4f9b\u4e00\u4e2a\u5f15\u7528\u7684\u5730\u5740\u6307\u5411\u5806\u5185\u5b58\u4e2d\u7684\u503c<\/strong>\uff0c\u6211\u4eec\u4ee5\u4e0a\u9762\u6d45\u62f7\u8d1d\u7684\u4f8b\u5b50\u753b\u4e2a\u56fe\uff1a<\/p>\n
\"\"<\/p>\n
\u5f53b=a\u8fdb\u884c\u62f7\u8d1d\u65f6\uff0c\u5176\u5b9e\u590d\u5236\u7684\u662fa\u7684\u5f15\u7528\u5730\u5740\uff0c\u800c\u5e76\u975e\u5806\u91cc\u9762\u7684\u503c\u3002<\/p>\n
\"\"<\/p>\n
\u800c\u5f53\u6211\u4eeca[0]=1<\/strong>\u65f6\u8fdb\u884c\u6570\u7ec4\u4fee\u6539\u65f6\uff0c\u7531\u4e8ea\u4e0eb\u6307\u5411\u7684\u662f\u540c\u4e00\u4e2a\u5730\u5740\uff0c\u6240\u4ee5\u81ea\u7136b\u4e5f\u53d7\u4e86\u5f71\u54cd\uff0c\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u6d45\u62f7\u8d1d\u4e86\u3002<\/p>\n
\"\"<\/p>\n
\u90a3\uff0c\u8981\u662f\u5728\u5806\u5185\u5b58\u4e2d\u4e5f\u5f00\u8f9f\u4e00\u4e2a\u65b0\u7684\u5185\u5b58\u4e13\u95e8\u4e3ab\u5b58\u653e\u503c\uff0c\u5c31\u50cf\u57fa\u672c\u7c7b\u578b\u90a3\u6837\uff0c\u5c82\u4e0d\u5c31\u8fbe\u5230\u6df1\u62f7\u8d1d\u7684\u6548\u679c\u4e86<\/p>\n
\"\"<\/p>\n
\u00a0\u53c1 \u2740 \u5b9e\u73b0\u7b80\u5355\u7684\u6df1\u62f7\u8d1d<\/strong><\/p>\n
1.\u6211\u4eec\u600e\u4e48\u53bb\u5b9e\u73b0\u6df1\u62f7\u8d1d\u5462\uff0c\u8fd9\u91cc\u53ef\u4ee5\u9012\u5f52\u9012\u5f52\u53bb\u590d\u5236\u6240\u6709\u5c42\u7ea7\u5c5e\u6027\u3002<\/strong><\/p>\n
\u8fd9\u4e48\u6211\u4eec\u5c01\u88c5\u4e00\u4e2a\u6df1\u62f7\u8d1d\u7684\u51fd\u6570(PS\uff1a\u53ea\u662f\u4e00\u4e2a\u57fa\u672c\u5b9e\u73b0\u7684\u5c55\u793a\uff0c\u5e76\u975e\u6700\u4f73\u5b9e\u8df5)<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
function deepClone(obj){\r\n    let objClone = Array.isArray(obj)?[]:{};\r\n    if(obj && typeof obj===\"object\"){\r\n        for(key in obj){\r\n            if(obj.hasOwnProperty(key)){\r\n                \/\/\u5224\u65adojb\u5b50\u5143\u7d20\u662f\u5426\u4e3a\u5bf9\u8c61\uff0c\u5982\u679c\u662f\uff0c\u9012\u5f52\u590d\u5236\r\n                if(obj[key]&&typeof obj[key] ===\"object\"){\r\n                    objClone[key] = deepClone(obj[key]);\r\n                }else{\r\n                    \/\/\u5982\u679c\u4e0d\u662f\uff0c\u7b80\u5355\u590d\u5236\r\n                    objClone[key] = obj[key];\r\n                }\r\n            }\r\n        }\r\n    }\r\n    return objClone;\r\n}    \r\nlet a=[1,2,3,4],\r\n    b=deepClone(a);\r\na[0]=2;\r\nconsole.log(a,b);<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n
\u53ef\u4ee5\u770b\u5230<\/p>\n
\"\"<\/p>\n
\u8ddf\u4e4b\u524d\u60f3\u8c61\u7684\u4e00\u6837\uff0c\u73b0\u5728b\u8131\u79bb\u4e86a\u7684\u63a7\u5236\uff0c\u4e0d\u518d\u53d7a\u5f71\u54cd\u4e86\u3002<\/p>\n
\u8fd9\u91cc\u518d\u6b21\u5f3a\u8c03\uff0c\u6df1\u62f7\u8d1d\uff0c\u662f\u62f7\u8d1d\u5bf9\u8c61\u5404\u4e2a\u5c42\u7ea7\u7684\u5c5e\u6027\uff0c\u53ef\u4ee5\u770b\u4e2a\u4f8b\u5b50\u3002JQ\u91cc\u6709\u4e00\u4e2aextend\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u62f7\u8d1d\u5bf9\u8c61\uff0c\u6211\u4eec\u6765\u770b\u770b<\/p>\n
\n
let a=[1,2,3,4],\r\n    b=a.slice();\r\na[0]=2;\r\nconsole.log(a,b);<\/pre>\n<\/div>\n
\"\"<\/p>\n
\u90a3\u662f\u4e0d\u662f\u8bf4slice\u65b9\u6cd5\u4e5f\u662f\u6df1\u62f7\u8d1d\u4e86\uff0c\u6bd5\u7adfb\u4e5f\u6ca1\u53d7a\u7684\u5f71\u54cd\uff0c\u4e0a\u9762\u8bf4\u4e86\uff0c\u6df1\u62f7\u8d1d\u662f\u4f1a\u62f7\u8d1d\u6240\u6709\u5c42\u7ea7\u7684\u5c5e\u6027\uff0c\u8fd8\u662f\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u6211\u4eec\u628aa\u6539\u6539<\/p>\n
\n
let a=[0,1,[2,3],4],\r\n        b=a.slice();\r\na[0]=1;\r\na[2][0]=1;\r\nconsole.log(a,b);<\/pre>\n<\/div>\n
\"\"<\/p>\n
\u62f7\u8d1d\u7684\u4e0d\u5f7b\u5e95\u554a\uff0cb\u5bf9\u8c61\u7684\u4e00\u7ea7\u5c5e\u6027\u786e\u5b9e\u4e0d\u53d7\u5f71\u54cd\u4e86\uff0c\u4f46\u662f\u4e8c\u7ea7\u5c5e\u6027\u8fd8\u662f\u6ca1\u80fd\u62f7\u8d1d\u6210\u529f\uff0c\u4ecd\u7136\u8131\u79bb\u4e0d\u4e86a\u7684\u63a7\u5236\uff0c\u8bf4\u660eslice\u6839\u672c\u4e0d\u662f\u771f\u6b63\u7684\u6df1\u62f7\u8d1d\u3002<\/p>\n
\u8fd9\u91cc\u5f15\u7528\u77e5\u4e4e\u95ee\u7b54\u91cc\u9762\u7684\u4e00\u5f20\u56fe<\/p>\n
\"\"<\/p>\n
\u7b2c\u4e00\u5c42\u7684\u5c5e\u6027\u786e\u5b9e\u6df1\u62f7\u8d1d\uff0c\u62e5\u6709\u4e86\u72ec\u7acb\u7684\u5185\u5b58\uff0c\u4f46\u66f4\u6df1\u7684\u5c5e\u6027\u5374\u4ecd\u7136\u516c\u7528\u4e86\u5730\u5740\uff0c\u6240\u4ee5\u624d\u4f1a\u9020\u6210\u4e0a\u9762\u7684\u95ee\u9898\u3002<\/p>\n
\u540c\u7406\uff0cconcat\u65b9\u6cd5\u4e0eslice\u4e5f\u5b58\u5728\u8fd9\u6837\u7684\u60c5\u51b5\uff0c\u4ed6\u4eec\u90fd\u4e0d\u662f\u771f\u6b63\u7684\u6df1\u62f7\u8d1d\uff0c\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u3002<\/p>\n
2.\u9664\u4e86\u9012\u5f52\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u501f\u7528JSON\u5bf9\u8c61\u7684parse\u548cstringify<\/strong><\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
function deepClone(obj){\r\n    let _obj = JSON.stringify(obj),\r\n        objClone = JSON.parse(_obj);\r\n    return objClone\r\n}    \r\nlet a=[0,1,[2,3],4],\r\n    b=deepClone(a);\r\na[0]=1;\r\na[2][0]=1;\r\nconsole.log(a,b);<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n
\"\"<\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u4e0bb\u662f\u5b8c\u5168\u4e0d\u53d7a\u7684\u5f71\u54cd\u4e86\u3002<\/p>\n
\u9644\u5e26\u8bf4\u4e0b\uff0cJSON.stringify\u4e0eJSON.parse\u9664\u4e86\u5b9e\u73b0\u6df1\u62f7\u8d1d\uff0c\u8fd8\u80fd\u7ed3\u5408localStorage\u5b9e\u73b0\u5bf9\u8c61\u6570\u7ec4\u5b58\u50a8\u3002\u6709\u5174\u8da3\u53ef\u4ee5\u9605\u8bfb\u535a\u4e3b\u8fd9\u7bc7\u6587\u7ae0\u3002<\/p>\n
localStorage\u5b58\u50a8\u6570\u7ec4\uff0c\u5bf9\u8c61\uff0clocalStorage,sessionStorage\u5b58\u50a8\u6570\u7ec4\u5bf9\u8c61<\/a><\/p>\n
3.\u9664\u4e86\u4e0a\u9762\u4e24\u79cd\u65b9\u6cd5\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u501f\u7528JQ\u7684extend\u65b9\u6cd5\u3002<\/strong><\/p>\n
$<\/em>.extend( [deep ], target, object1 [, objectN ] )<\/strong><\/p>\n
deep<\/strong>\u8868\u793a\u662f\u5426\u6df1\u62f7\u8d1d\uff0c\u4e3atrue\u4e3a\u6df1\u62f7\u8d1d\uff0c\u4e3afalse\uff0c\u5219\u4e3a\u6d45\u62f7\u8d1d<\/p>\n
target<\/strong>\u00a0Object<\/strong>\u7c7b\u578b \u76ee\u6807\u5bf9\u8c61\uff0c\u5176\u4ed6\u5bf9\u8c61\u7684\u6210\u5458\u5c5e\u6027\u5c06\u88ab\u9644\u52a0\u5230\u8be5\u5bf9\u8c61\u4e0a\u3002<\/span><\/p>\n
object1\u00a0\u00a0objectN<\/strong>\u53ef\u9009\u3002 Object\u7c7b\u578b \u7b2c\u4e00\u4e2a\u4ee5\u53ca<\/span>\u7b2cN\u4e2a\u88ab\u5408\u5e76\u7684\u5bf9\u8c61\u3002<\/p>\n
\n
let a=[0,1,[2,3],4],\r\n    b=$.extend(true,[],a);\r\na[0]=1;\r\na[2][0]=1;\r\nconsole.log(a,b);<\/pre>\n<\/div>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u6548\u679c\u4e0e\u4e0a\u9762\u65b9\u6cd5\u4e00\u6837\uff0c\u53ea\u662f\u9700\u8981\u4f9d\u8d56JQ\u5e93\u3002<\/p>\n
\"\"<\/p>\n
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\u00a0\u8086 \u2740 \u603b<\/strong><\/p>\n
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 <\/p>\n
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