js_progress/bind.html at master · Max-hearted/js_progress · GitHub

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<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <!-- bind()函数的底层模拟实现 -->

    <script type="text/javascript">
      Function.prototype.newBind = function (target) {
        var target = target || window;
        var that = this;
        var args = [].slice.call(arguments, 1);
        var temp = function() {};
        var func = function () {
          var _args = [].slice.call(arguments, 0);
          return that.apply(this instanceof temp ? this : target, args.cancat(_args));
        }

        temp.prototype = this.prototype;
        func.prototype = new temp();
        return func;
      }
    </script>
  </body>
</html>