JavaScript中，快速实现一个对象的复制！
1、第一种方式，通过JSON转换。
function clone (src) { return JSON.parse(JSON.stringify(src));}function clone(src) { function mixin(dest, source, copyFunc) { var name, s, i, empty = {}; for(name in source){ // the (!(name in empty) || empty[name] !== s) condition avoids copying properties in "source" // inherited from Object.prototype. For example, if dest has a custom toString() method, // don't overwrite it with the toString() method that source inherited from Object.prototype s = source[name]; if(!(name in dest) || (dest[name] !== s && (!(name in empty) || empty[name] !== s))){ dest[name] = copyFunc ? copyFunc(s) : s; } } return dest; } if(!src || typeof src != "object" || Object.prototype.toString.call(src) === "[object Function]"){ // null, undefined, any non-object, or function return src; // anything } if(src.nodeType && "cloneNode" in src){ // DOM Node return src.cloneNode(true); // Node } if(src instanceof Date){ // Date return new Date(src.getTime()); // Date } if(src instanceof RegExp){ // RegExp return new RegExp(src); // RegExp } var r, i, l; if(src instanceof Array){ // array r = []; for(i = 0, l = src.length; i < l; ++i){ if(i in src){ r.push(clone(src[i])); } } // we don't clone functions for performance reasons // }else if(d.isFunction(src)){ // // function // r = function(){ return src.apply(this, arguments); }; }else{ // generic objects r = src.constructor ? new src.constructor() : {}; } return mixin(r, src, clone);}