$('elems').each() 带粗箭头 [英] $('elems').each() with fat arrow

问题描述

我开始使用 ES6 粗箭头函数表示法，我非常喜欢它.但我对它的上下文有点困惑.据我所知，胖箭头函数中的 this 关键字是指函数当前运行的上下文.我想做一些简单的 jQuery 迭代，例如:

I started to use ES6 fat arrow function notation and I really like it. But I am a little bit confused about it context. As far as I know, keyword this inside fat arrow function refers to context where the function is currently running. I wanted to do some simple jQuery iteration like:

$('ul#mylist > li').each(() => {
   $(this).addClass('some-class-name');
});

但显然这段代码不起作用.我如何在胖箭头函数中引用此特定代码中的当前LI"元素?

But obviously this piece of code not working. How do I refer, inside fat arrow function, to current "LI" element in this specific code?

推荐答案

each() 方法为回调函数提供两个参数.它们是当前索引和当前项目.因此，您可以执行以下操作:

The each() method supplies two parameters to the callback-function. They are current index and the current item. Thus you could do the following:

$('ul#mylist > li').each((i, v) => {
   $(v).addClass('some-class-name');
});

其中v"变量是当前的li"元素

Where the "v" variable is the current "li" element

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