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@@ -0,0 +1,40 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+</head>
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+
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+<body>
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+ <script>
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+ // 第一步向Function.prototype上添加一个bind2方法
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+ Function.prototype.bind2 = function (obj) {
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+ // 返回一个函数
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+ let that = this;
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+ return function () {
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+ that.call(obj);
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+ }
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+ }
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+
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+
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+ function foo(x,y) {
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+ console.log(this.a,x,y)//hello
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+ }
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+ var obj = {
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+ a: "hello"
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+ }
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+
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+
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+ var foo2 = foo.bind2(obj,1,2);
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+ foo2()
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+
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+
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+
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+
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+
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+ </script>
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+</body>
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+
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+</html>
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