绑定它或使用变量更好吗？ [英] Is it better to bind this or use a variable?

问题描述

做得更好，

asset.addEventListener("load", function () {
  this.emit({
    type: "load",
    asset: asset
  });
}.bind(this), false);

或

var scope = this;

asset.addEventListener("load", function () {
  scope.emit({
    type: "load",
    asset: asset
  });
}, false);

绑定函数是否更好，或者只是将引用存储到这个在变量中？

Is it better to bind the function, or just store the reference to this in a variable?

推荐答案

我觉得第二种选择更好，只是为了防止任何混淆。使用这个一直是许多JavaScript问题的问题，所以当你可以避免它时，你应该在我看来。顺便说一下，这也是在像Knockout这样的库中完成的。

I feel that the second option is better, just to prevent any confusion. The usage of this has been the problem of many a JavaScript problem, so when you can avoid it you should in my opinion. By the way, this is also done in libraries like Knockout.

如果你想了解更多关于这个关键字，这是对<* c $ c>这个的各种不同值的一个很好的解释： http://javascriptweblog.wordpress.com/2010/08/30/understanding-javascripts-this/

If you'd like to know more about the this keyword, this is a nice explanation of the various different values this can have in different contexts: http://javascriptweblog.wordpress.com/2010/08/30/understanding-javascripts-this/

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