Question

任何人都知道将JS回调绑定到＆＃34;这个＆＃34;没有＆＃34; bind（）＆＃34;？

2013在V8上：工作正常（请参阅linked shot，太大而无法添加）

2012在SquirrelFish上：获得例外：＆＃34; bind（）＆＃34;不作为函数提供（请参阅linked shot，太大而无法添加）

违规代码是：

＆＃13;

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

＆＃13;

任何提示？

Answer 1

在MDN上找到

Polyfill

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＆＃34; bind（）＆＃34;，如何将JS回调绑定到＆＃34;这个＆＃34;没有它？

1 个答案: