The selector contains spaces in use examples and precautions _jquery

Source: Internet
Author: User
principle Explanation:

var $t _a=$ (". Test:hidden")//with a space is the selection class for the hidden elements of test;
var $t _a=$ (". Test:hidden")//without spaces is the element that selects the hidden class as test;

An example is provided:
Copy Code code as follows:

<script type= "Text/javascript" src= "Jquery-1.3.2.min.js" ></script>
<script type= "Text/javascript" >
$ (document). Ready (function () {
var $a 1=$ (". Test:hidden");
var $a 2=$ (". Test:hidden");
Alert ($a 1.length+ "" + $a 2.length)
<div class= "test" style= "Display:none;" >
<p style= "Display:none" >dddddddd</p>
<p style= "Display:none" >dddddddd</p>
<div class= "test" style= "Display:none" >
</div><div class= "test" style= "Display:none" ></div>

The output results were: 2 and 3;

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