只针对Object类型的深拷贝，自己总结的三种方式，分别为：递归的方式、广度优先遍历的方式、使用JSON.parse()方法。

  1. 递归：

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    function copy(source) {
      var key, target
      if (type(source) === "object") {
        target = {}
        for (key in source) {
          if (type(source[key]) === "array" || "object") {
            target[key] = copy(source[key])
          } else if (source[key] !== undefined) target[key] = source[key]
        }
      }
      return target
    }

  2. 广度优先遍历

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    function copy(data){
        var obj = {};
        var originQueue = [data];
        var copyQueue = [obj];
        while(originQueue.length > 0){
            var _data = originQueue.shift();
            var _obj = copyQueue.shift();
            for(var key in _data){
                var _value = _data[key]
                if(typeof _value !== 'object'){
                    _obj[key] = _value;
                } else {
                    originQueue.push(_value);
                    _obj[key] = {};
                    copyQueue.push(_obj[key]);
                }
            }
        }
        return obj;
    }

  3. JSON

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    JSON.parse(JSON.stringify(source))

参考: http://blog.csdn.net/sysuzhyupeng/article/details/70340598