JavaScript中的$符号是什么 [英] What is the $ symbol used for in JavaScript

问题描述

我是JavaScript学习者，一直在研究此问题，但没有成功.除正则表达式外，JavaScript中的$符号是什么?任何资源或与此有关的阅读将不胜感激. 谢谢.

I am a JavaScript learner and have been researching this matter, but with no success. What is the $ symbol used for in JavaScript besides regular expressions? Any resources or readings regarding this would be appreciated. Thanks.

推荐答案

这没什么特别的.

但是由于标识符名称中允许使用$，因此许多Javascript库都将$用作它们的中央"接口，或者至少用作访问其功能的快捷方式.

But because $ is allowed in identifier names, many Javascript libraries have taken to using $ as the "central" interface to them, or at least as a shortcut for accessing their functionality.

例如，如果您使用的是jQuery并说$("div")，则这是对带有参数"div"的$函数的调用.当您说$.post()时，它将在$对象上调用post方法(JavaScript很不错，因为函数是一等对象).

For example, if you're using jQuery and you say $("div"), this is a call to the $ function with argument "div". When you say $.post(), it's calling the post method on the $ object (Javascript is nice in that functions are first-class objects).

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