What is $() in jquery library

is the jquery object, $() is jQuery(), you can pass parameters in it, and its function is to get the element

##The following example

$(".div1") means to get the element with the class name div1, for example, get

$(".div1").onclick represents the click event of the div with the class name div1

$ is the jQuery object, which is a Function object. $() calls this function and gets

Example:

html

<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ul>

js

Method One

 // 传入DOM元素
        $('li').each(function(index,ele){
               $(ele).on('click',function(){
                   $(this).css('background','red');//这里的DOM元素就是this
               })
       })
       
       //传入DOM数组
       var aLi=document.getElementsByTagName('li');
           aLi=[].slice.call(aLi);//集合转数组
           var $aLi=$(aLi);
           $aLi.html('我是jQuery对象');//所有的li的内容都变成'我是jQuery对象'

Method Two

 // 传入DOM元素
        jQuery('li').each(function(index,ele){
               jQuery(ele).on('click',function(){
                   jQuery(this).css('background','red');//这里的DOM元素就是this
               })
       })
       
       //传入DOM数组
       var aLi=document.getElementsByTagName('li');
           aLi=[].slice.call(aLi);//集合转数组
           var $aLi=$(aLi);
           $aLi.html('我是jQuery对象');//所有的li的内容都变成'我是jQuery对象'

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