“this”,“$ this”和“$(this)”之间有什么区别? [英] What is the difference between “this”, “$this” and “$(this)”?

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问题描述

这三种形式有什么区别:

What is the difference between these three forms:

this
$this
$(this)


推荐答案

典型的用法你通常会看到这样的( $ this 用法可能会有所不同):

In typical usage you'll usually see them like this (the $this usage may vary):


  • this - 指你当前处理的处理程序中的DOM元素,但这可能是完全在其他情况下的另一个对象,但它始终是上下文。

  • $ this - 通常由创建var $ this = $(this) a缓存版本的jQuery包装版本以提高效率(或链接 $(this)以在许多情况下获得相同的效果)。

  • $(this) - 该元素的jQuery包装版本,因此您可以访问所有方法(特别是 $。fn )。

  • this - Refers to the DOM element in the handler you're currently on, but this may be another object entirely in other situations, but it's always the context.
  • $this - Usually created by var $this = $(this) a cached version of the jQuery wrapped version for efficiency (or chain off $(this) to get the same in many cases).
  • $(this) - The jQuery wrapped version of the element, so you have access to all its methods (the ones in $.fn specifically).

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