为什么JavaScript变量以美元符号开头？ [英] Why would a JavaScript variable start with a dollar sign?

问题描述

我经常看到带有以美元符号开头的变量的JavaScript。何时/为什么你会选择以这种方式为变量添加前缀？

I quite often see JavaScript with variables that start with a dollar sign. When/why would you choose to prefix a variable in this way?

（我不是在询问 $（'p.foo'） 您在jQuery和其他人看到的语法，但是正常的变量，如 $ name 和 $ order ）

(I'm not asking about $('p.foo') syntax that you see in jQuery and others, but normal variables like $name and $order)

推荐答案

jQuery中一个非常常见的用法是将存储在变量中的jQuery对象与其他变量区分开来。例如，我会定义

A very common use in jQuery is to distinguish jQuery objects stored in variables from other variables. For example, I would define

var $email = $("#email"); // refers to the jQuery object representation of the dom object
var email_field = $("#email").get(0); // refers to the dom object itself

我觉得这对编写jQuery代码很有帮助很容易看到具有不同属性集的jQuery对象。

I find this to be very helpful in writing jQuery code and makes it easy to see jQuery objects which have a different set of properties.

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