## [JavaScript 深拷贝实现](https://github.com/wengjq/Blog/issues/3)

```js
var $ = (function () {
    'use strict';

    var types = 'Array Object String Date RegExp Function Boolean Number Null Undefined'.split(' ');

	function type () {
	   return Object.prototype.toString.call(this).slice(8, -1);
	}

	for (var i = types.length; i--;) {
	    $['is' + types[i]] = (function (self) {
	        return function (elem) {
	           return type.call(elem) === self;
	        };
	    })(types[i]);
	}

    return $;
})();//类型判断

function copy (obj,deep) {
    if (obj === null || (typeof obj !== "object" && !$.isFunction(obj))) {
        return obj;
    }

    if ($.isFunction(obj)) {
    	return new Function("return " + obj.toString())();
    }
    else {
        var name, target = $.isArray(obj) ? [] : {}, value;

        for (name in obj) {
            value = obj[name];

            if (value === obj) {
            	continue;
            }

            if (deep) {
                if ($.isArray(value) || $.isObject(value)) {
                    target[name] = copy(value,deep);
                } else if ($.isFunction(value)) {
                    target[name] = new Function("return " + value.toString())();
                }
            } else {
            	target[name] = value;
            }
        }
        return target;
    }　
}
```