javascript - 有人可以用Javascript解释美元符号吗？(Can someone explain the dollar sign in Javascript?)

Question

The code in question is here:

(有问题的代码在这里：)

var $item = $(this).parent().parent().find('input');

What is the purpose of the dollar sign in the variable name, why not just exclude it?

(变量名中美元符号的目的是什么，为什么不排除呢？)

  ask by Keith Donegan translate from so

Answer 1

A '$' in a variable means nothing special to the interpreter, much like an underscore.

(变量中的'$'对解释器来说没有什么特别之处，就像下划线一样。)

From what I've seen, many people using jQuery (which is what your example code looks like to me) tend to prefix variables that contain a jQuery object with a $ so that they are easily identified and not mixed up with, say, integers.

(从我所看到的，很多人使用jQuery （这是你的示例代码对我来说）倾向于为包含带有$的jQuery对象的变量添加前缀，以便它们易于识别并且不会与整数相混淆。)

The dollar sign function $() in jQuery is a library function that is frequently used, so a short name is desirable.

(jQuery中的美元符号函数$()是一个经常使用的库函数，因此需要一个简短的名称。)