Coffeescript - 'this'在fat arrow回调中总是被'_this'取代 [英] Coffeescript - 'this' is always replaced by '_this' in fat arrow callback

问题描述

我想知道是否可能以某种方式阻止这个关键字转换成 _this 里面fat arrow回调 => ）？

例如：

  class someClass 
 
 someMethod： - > 
 $（document）.on'click'，'.myclass'，（e）=> 
＃做正确的上下文这个，没关系
 @anotherMethod（）
 @oneMoreMethod（）
 
＃但这里我需要jQuery``this``指向到元素
 $ el = $ this＃这被转换成``_this`` :( 
  

可能我错过了一些选项或操作符？

UPDATE
我知道如 = this ，但我认为CS有更优雅的东西。

解决方案

=> 。

使用 $（e.currentTarget）获得一个 元素的句柄，这与 $（e.target）不一样

没有，CoffeeScript 不能有任何更优雅的方式来处理这个问题，你只能有一个函数的上下文绑定函数不是CoffeeScript的特有的，它们是JavaScript的一个特性，解决方案是为调用代码提供另一种访问元素的方式，jQuery用 e.target 和 e.currentTarget 。

I'm wondering is possible somehow to prevent this keyword to be transformed into _this inside fat arrow callback (=>)?

For example:

class someClass

  someMethod: ->
    $(document).on 'click', '.myclass', (e) =>
      # doing things with right context this, it's ok
      @anotherMethod()
      @oneMoreMethod()

      # but here I need jQuery ``this`` pointing to element
      $el = $ this # this is transformed into ``_this`` :(

Maybe I missed some option or operator?

UPDATE I know about the trick like self = this, but I thought CS has something more elegant..

解决方案

That's the whole purpose of =>.

Use $(e.currentTarget) to get a handle to the element that would have been this. This is not the same as $(e.target) which you have already rejected.

And no, CoffeeScript can't have anything more elegant way to handle this. You can only have one context for a function. Bound functions aren't unique to CoffeeScript, they're a feature of JavaScript, and the solution is for the calling code to provide another way of accessing the element, which jQuery does with e.target and e.currentTarget.

这篇关于Coffeescript - 'this'在fat arrow回调中总是被'_this'取代的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！