Sharing of commonly used selectors in jQuery
1. jQuery: (When using jQuery, you must indicate the version number we use)
It is a class library that uses native JS to encapsulate commonly used methods ( Solve browser compatibility issues)
2. Methods provided in jQuery
Selector
By passing the content of the corresponding rule (ID, tag name, style class name...), the specified element/element collection in the page is obtained
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id='div1'>
<div>
<span></span>
<span></span>
<span></span>
</div>
<div></div>
<div id='div3'></div>
<ul>
<li></li>
<li></li>
<li></li>
</ul>
</div>
<script>//原生JS获取到的结果属于元素对象/元素集合/节点集合...他们可以使用浏览器为其提供的那些天生自带的属性和方法//原生的JS对象不能直接的使用jQuery中提供的属性和方法var oDiv = document.getElementById('div1')
oDiv.clientWidth
oDiv.getAttribute//jq获取到的结果是一个jQuery对象，可以使用jQuery里面提供的属性和方法，但是不能直接的使用浏览器内置的属性和方法var $oDiv = jQuery("#div1")//$("#div1") $oDiv.innerWidth();
$oDiv.attr//关于原生JS对象和jQuery对象之间的转换//1)、原生的转变成jQuery:$(原生JS对象) $(oDiv)//2)、jQuery转化成原生：直接通过索引获取对应的元素对象即可$oDiv[0]
$oDiv.get(0)//<==>$oDiv[0]都是通过索引来获取指定位置的元素（JS原生对象）//更多的jQuery选择器$('#div1')
$('div')
$('.w100')
$('*')
$('#div1,div,.w100')//把每一个选择器获取到的jQuery对象最后融合在一起，最后一起获取到$('#div1 li')//在子子孙孙级中进行查找$('#div1>li')//在子级中进行查找$('#div3+')//获取它的下一个弟弟$('#div3+ul')//获取它的下一个弟弟并且标签名是ul的$('#div3~')//获取它的所有的弟弟元素$('#div3~ul')//获取它的所有的弟弟元素并且标签名为ul的$('#div1>div:not(.w100)')//#div1下的所有子集div样式类名不包含w100的$('#div1>div:eq(0)')//通过索引获取到集合中的某一个，但是获取到的结果依然是一个jQuery对象（而get方法也是通过索引获取，但是获取到的是一个JS原生对象）$('#div1>div:gt(1)')//大于索引1的（不包含索引1的）$('#div1>div:lt(1)')//小于索引1的（不包含索引1的）$('#div1 li:contains("我")')//获取所有的li内容包含“我” 的$('#div1 div:has(ul)')//在所有的div中包含ul的$('#div1>*:nth-child(1)')//获取所有的子元素的第一个$('#div1>*:eq(1)')//获取所有的子元素的第二个（索引为1）</script>
</body>
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