SquirrelFish 似乎错过了 "bind()"，如何在没有它的情况下将 JS 回调绑定到 "this"？

Question

有人知道在没有 "bind()" 的情况下将 JS 回调绑定到 "this" 吗？

2013 在 V8 上：工作正常（参见 linked shot，太大而无法添加）

2012 在 SquirrelFish 上：获取异常："bind()" 不可作为函数使用（参见 linked shot，太大而无法添加）

违规代码是这样的：

  var extJsCallBacks = [
          function(){this._setupSystemInfo();}.bind(this), 
          function(){this._setupConfigInfo();}.bind(this),
          function(){this._setupRepository();}.bind(this), 
          function(){this._setupContents();}.bind(this)
          ];

有什么提示吗？

Answer 1

Polyfill 在 MDN

上找到

if (!Function.prototype.bind) {
  Function.prototype.bind = function(oThis) {
    if (typeof this !== 'function') {
      // closest thing possible to the ECMAScript 5
      // internal IsCallable function
      throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
    }

    var aArgs   = Array.prototype.slice.call(arguments, 1),
        fToBind = this,
        fNOP    = function() {},
        fBound  = function() {
          return fToBind.apply(this instanceof fNOP
                 ? this
                 : oThis,
                 aArgs.concat(Array.prototype.slice.call(arguments)));
        };

    if (this.prototype) {
      // Function.prototype doesn't have a prototype property
      fNOP.prototype = this.prototype; 
    }
    fBound.prototype = new fNOP();

    return fBound;
  };
}

SquirrelFish 似乎错过了 "bind()"，如何在没有它的情况下将 JS 回调绑定到 "this"？

SquirrelFish seems to miss "bind()", how to bind a JS callback to "this" without it?

javascript

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