{"id":43865,"date":"2023-12-11T15:01:07","date_gmt":"2023-12-11T07:01:07","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=43865"},"modified":"2023-12-11T15:01:07","modified_gmt":"2023-12-11T07:01:07","slug":"%e5%ae%9e%e7%8e%b0js%e4%b8%ad%e6%89%80%e6%9c%89%e5%af%b9%e8%b1%a1%e7%9a%84%e6%b7%b1%e5%ba%a6%e5%85%8b%e9%9a%86%ef%bc%88%e5%8c%85%e8%a3%85%e5%af%b9%e8%b1%a1%ef%bc%8cdate%e5%af%b9%e8%b1%a1%ef%bc%8c-2","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/%e5%ae%9e%e7%8e%b0js%e4%b8%ad%e6%89%80%e6%9c%89%e5%af%b9%e8%b1%a1%e7%9a%84%e6%b7%b1%e5%ba%a6%e5%85%8b%e9%9a%86%ef%bc%88%e5%8c%85%e8%a3%85%e5%af%b9%e8%b1%a1%ef%bc%8cdate%e5%af%b9%e8%b1%a1%ef%bc%8c-2\/","title":{"rendered":"\u5b9e\u73b0js\u4e2d\u6240\u6709\u5bf9\u8c61\u7684\u6df1\u5ea6\u514b\u9686\uff08\u5305\u88c5\u5bf9\u8c61\uff0cDate\u5bf9\u8c61\uff0c\u6b63\u5219\u5bf9\u8c61\uff09\uff1f"},"content":{"rendered":"

“`” \u53c2\u8003\u56de\u7b54\uff1a<\/p>\n

\u901a\u8fc7\u9012\u5f52\u53ef\u4ee5\u7b80\u5355\u5b9e\u73b0\u5bf9\u8c61\u7684\u6df1\u5ea6\u514b\u9686\uff0c\u4f46\u662f\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u7ba1\u662fES6\u8fd8\u662fES5\u5b9e\u73b0\uff0c\u90fd\u6709\u540c\u6837\u7684\u7f3a\u9677\uff0c\u5c31\u662f\u53ea\u80fd\u5b9e\u73b0\u7279\u5b9a\u7684object\u7684\u6df1\u5ea6\u590d\u5236\uff08\u6bd4\u5982\u6570\u7ec4\u548c\u51fd\u6570\uff09\uff0c\u4e0d\u80fd\u5b9e\u73b0\u5305\u88c5\u5bf9\u8c61Number\uff0cString \uff0c Boolean\uff0c\u4ee5\u53caDate\u5bf9\u8c61\uff0cRegExp\u5bf9\u8c61\u7684\u590d\u5236\u3002<\/p>\n

(1)\u524d\u6587\u7684\u65b9\u6cd5<\/p>\n

<pre><code class=""language-javascript"" lang=""javascript"">function deepClone(obj){
\nvar newObj= obj instanceof Array?[]:{};
\nfor(var i in obj){
\nnewObj[i]=typeof obj[i]=='object'?
\ndeepClone(obj[i]):obj[i];
\n}
\nreturn newObj;
\n}
\n<\/code><\/pre><\/p>\n

\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u4e00\u822c\u5bf9\u8c61\u548c\u6570\u7ec4\u5bf9\u8c61\u7684\u514b\u9686\uff0c\u6bd4\u5982\uff1a<\/p>\n

<pre><code class=""language-javascript"" lang=""javascript"">var arr=[1,2,3];
\nvar newArr=deepClone(arr);
\n\/\/ newArr->[1,2,3]
\nvar obj={
\nx:1,
\ny:2
\n}
\nvar newObj=deepClone(obj);
\n\/\/ newObj={x:1,y:2}
\n<\/code><\/pre><\/p>\n

\u4f46\u662f\u4e0d\u80fd\u5b9e\u73b0\u4f8b\u5982\u5305\u88c5\u5bf9\u8c61Number,String,Boolean,\u4ee5\u53ca\u6b63\u5219\u5bf9\u8c61RegExp\u548cDate\u5bf9\u8c61\u7684\u514b\u9686\uff0c\u6bd4\u5982\uff1a<\/p>\n

\/\/Number\u5305\u88c5\u5bf9\u8c61<\/p>\n

<pre><code class=""language-javascript"" lang=""javascript"">var num=new Number(1);
\ntypeof num \/\/ ""object""
\nvar newNum=deepClone(num);
\n<\/code><\/pre><\/p>\n

\/\/newNum -> {} \u7a7a\u5bf9\u8c61<\/p>\n

\u00a0<\/p>\n

\/\/String\u5305\u88c5\u5bf9\u8c61<\/p>\n

<pre><code class=""language-javascript"" lang=""javascript"">var str=new String(""hello"");
\ntypeof str \/\/""object""
\nvar newStr=deepClone(str);
\n\/\/newStr-> {0:'h',1:'e',2:'l',3:'l',4:'o'};
\n<\/code><\/pre><\/p>\n

\u00a0<\/p>\n

\/\/Boolean\u5305\u88c5\u5bf9\u8c61<\/p>\n

<pre><code class=""language-javascript"" lang=""javascript"">var bol=new Boolean(true);
\ntypeof bol \/\/""object""
\nvar newBol=deepClone(bol);
\n<\/code><\/pre><\/p>\n

\/\/ newBol ->{} \u7a7a\u5bf9\u8c61<\/p>\n

\u00a0<\/p>\n

….<\/p>\n

(2)valueof()\u51fd\u6570<\/p>\n

\u6240\u6709\u5bf9\u8c61\u90fd\u6709valueOf\u65b9\u6cd5\uff0cvalueOf\u65b9\u6cd5\u5bf9\u4e8e\uff1a\u5982\u679c\u5b58\u5728\u4efb\u610f\u539f\u59cb\u503c\uff0c\u5b83\u5c31\u9ed8\u8ba4\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u8868\u793a\u5b83\u7684\u539f\u59cb\u503c\u3002\u5bf9\u8c61\u662f\u590d\u5408\u503c\uff0c\u800c\u4e14\u5927\u591a\u6570\u5bf9\u8c61\u65e0\u6cd5\u771f\u6b63\u8868\u793a\u4e3a\u4e00\u4e2a\u539f\u59cb\u503c\uff0c\u56e0\u6b64\u9ed8\u8ba4\u7684valueOf()\u65b9\u6cd5\u7b80\u5355\u5730\u8fd4\u56de\u5bf9\u8c61\u672c\u8eab\uff0c\u800c\u4e0d\u662f\u8fd4\u56de\u4e00\u4e2a\u539f\u59cb\u503c\u3002\u6570\u7ec4\u3001\u51fd\u6570\u548c\u6b63\u5219\u8868\u8fbe\u5f0f\u7b80\u5355\u5730\u7ee7\u627f\u4e86\u8fd9\u4e2a\u9ed8\u8ba4\u65b9\u6cd5\uff0c\u8c03\u7528\u8fd9\u4e9b\u7c7b\u578b\u7684\u5b9e\u4f8b\u7684valueOf()\u65b9\u6cd5\u53ea\u662f\u7b80\u5355\u8fd4\u56de\u8fd9\u4e2a\u5bf9\u8c61\u672c\u8eab\u3002<\/p>\n

\u5bf9\u4e8e\u539f\u59cb\u503c\u6216\u8005\u5305\u88c5\u7c7b\uff1a<\/p>\n

<pre><code>function baseClone(base){
\nreturn base.valueOf();
\n}
\n\/\/Number
\nvar num=new Number(1);
\nvar newNum=baseClone(num);
\n\/\/newNum->1
\n\/\/String
\nvar str=new String('hello');
\nvar newStr=baseClone(str);
\n\/\/ newStr->""hello""
\n\/\/Boolean
\nvar bol=new Boolean(true);
\nvar newBol=baseClone(bol);
\n\/\/newBol-> true
\n<\/code><\/pre><\/p>\n

\u5176\u5b9e\u5bf9\u4e8e\u5305\u88c5\u7c7b\uff0c\u5b8c\u5168\u53ef\u4ee5\u7528=\u53f7\u6765\u8fdb\u884c\u514b\u9686\uff0c\u5176\u5b9e\u6ca1\u6709\u6df1\u5ea6\u514b\u9686\u4e00\u8bf4\uff0c<\/p>\n

\u8fd9\u91cc\u7528valueOf\u5b9e\u73b0\uff0c\u8bed\u6cd5\u4e0a\u6bd4\u8f83\u7b26\u5408\u89c4\u8303\u3002<\/p>\n

\u5bf9\u4e8eDate\u7c7b\u578b\uff1a<\/p>\n

\u56e0\u4e3avalueOf\u65b9\u6cd5\uff0c\u65e5\u671f\u7c7b\u5b9a\u4e49\u7684valueOf()\u65b9\u6cd5\u4f1a\u8fd4\u56de\u5b83\u7684\u4e00\u4e2a\u5185\u90e8\u8868\u793a\uff1a1970\u5e741\u67081\u65e5\u4ee5\u6765\u7684\u6beb\u79d2\u6570.\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u5728Date\u7684\u539f\u578b\u4e0a\u5b9a\u4e49\u514b\u9686\u7684\u65b9\u6cd5\uff1a<\/p>\n

<pre><code>Date.prototype.clone=function(){
\nreturn new Date(this.valueOf());
\n}
\nvar date=new Date('2010');
\nvar newDate=date.clone();
\n\/\/ newDate-> Fri Jan 01 2010 08:00:00 GMT+0800
\n<\/code><\/pre><\/p>\n

\u5bf9\u4e8e\u6b63\u5219\u5bf9\u8c61RegExp\uff1a<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” \u53c2\u8003\u56de\u7b54\uff1a \u901a\u8fc7\u9012\u5f52\u53ef\u4ee5\u7b80\u5355\u5b9e\u73b0\u5bf9\u8c61\u7684\u6df1\u5ea6\u514b\u9686\uff0c\u4f46\u662f\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u7ba1\u662fES6\u8fd8\u662fE […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-43865","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/43865","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=43865"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/43865\/revisions"}],"predecessor-version":[{"id":43866,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/43865\/revisions\/43866"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=43865"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=43865"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=43865"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}