Usage examples and precautions when the selector contains spaces_jquery

Principle explanation:

var $t_a=$(".test :hidden") //The space indicates that the class is selected as the hidden element in test;
var $t_a =$(".test:hidden")//Without spaces, it means selecting hidden elements with class test;

Example:

Copy code The code is as follows:

< ;div class="test" style="display:none;">

dddddddd

dddddddd

The output results are: 2 and 3 respectively;