/* ================ 深拷贝 ================ */ function deepClone(initalObj, finalObj) { var obj = finalObj || {}; for (var i in initalObj) { var prop = initalObj[i]; // 避免相互引用对象导致死循环，如initalObj.a = initalObj的情况 if(prop === obj) { continue; } if (typeof prop === 'object') { obj[i] = (prop.constructor === Array) ? [] : Object.create(prop); } else { obj[i] = prop; } } return obj; }
三. 参考：jQuery.extend()方法的实现
jQuery.js的jQuery.extend()也实现了对象的深拷贝。下面将官方代码贴出来，以供参考。
官方链接地址：https://github.com/jquery/jquery/blob/master/src/core.js。
jQuery.extend = jQuery.fn.extend = function() { var options, name, src, copy, copyIsArray, clone, target = arguments[ 0 ] || {}, i = 1, length = arguments.length, deep = false; // Handle a deep copy situation if ( typeof target === "boolean" ) { deep = target; // Skip the boolean and the target target = arguments[ i ] || {}; i++; } // Handle case when target is a string or something (possible in deep copy) if ( typeof target !== "object" && !jQuery.isFunction( target ) ) { target = {}; } // Extend jQuery itself if only one argument is passed if ( i === length ) { target = this; i--; } for ( ; i < length; i++ ) { // Only deal with non-null/undefined values if ( ( options = arguments[ i ] ) != null ) { // Extend the base object for ( name in options ) { src = target[ name ]; copy = options[ name ]; // Prevent never-ending loop if ( target === copy ) { continue; } // Recurse if we're merging plain objects or arrays if ( deep && copy && ( jQuery.isPlainObject( copy ) || ( copyIsArray = jQuery.isArray( copy ) ) ) ) { if ( copyIsArray ) { copyIsArray = false; clone = src && jQuery.isArray( src ) ? src : []; } else { clone = src && jQuery.isPlainObject( src ) ? src : {}; } // Never move original objects, clone them target[ name ] = jQuery.extend( deep, clone, copy ); // Don't bring in undefined values } else if ( copy !== undefined ) { target[ name ] = copy; } } } } // Return the modified object return target; };
这篇文章主要是介绍js关于深拷贝的内容，其它的内容可以查看脚本之家以前发表的文章
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