模拟apply跟call _Web前端

模拟apply和call
<html>
<head>
<script type="text/javascript">
Function.prototype.Apply = function (obj, arr) {
	obj = obj || window;
	obj._tempFunction = this;
	var rv;
	if (!arr) {
		rv = obj._tempFunction();
	} else {
		var args = [];
		for (var i = 0, len = arr.length; i < len; i++) {
			args.push('arr[' + i + ']');
		}
		rv = eval("obj._tempFunction(" + args + ")");
	}
	delete obj._temFunction;
	return rv;
}
Function.prototype.Call = function () {
	return this.Apply(Array.prototype.shift.Apply(arguments), arguments);
}

var obj = {};
function f(a,b,c) {
	console.log(this == obj);//看看Apply和Call 是不是把函数内的this 指向了 obj对象
	console.log(a + b + c);
}
f(1, 2, 3);
f.Apply(obj, [4, 5, 6]);
f.Call(obj, 7, 8, 9);

</script>
</head>
<body>
</body>
</html>