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>
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