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原生querySelector()与querySelectorAll()获取元素实例
phpcn_u68463的博客
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<html>

<head>

<meta charset="UTF-8">

<title>css方法获取页面元素</title>

</head>

<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js" type="text/javascript" charset="utf-8"></script>

<body>

<ul>

<li>7:00起床</li>

<li>7:30出门上班</li>

<li>8:50下地铁</li>

<li>9:00吃早餐</li>

<li>9:30到公司打卡上班</li>

</ul>

<button>点击改变</button>

</body>

</html>

<script type="text/javascript">

var btn = document.getElementsByTagName('button')[0]



// 1.获取单个的方法

btn.onclick = function(){

document.querySelector('li').style.background = 'blue'


}



// 2.获取所有的方法

btn.onclick = function(){


var li =document.getElementsByTagName('li')

var li =document.querySelectorAll('li')

for(i=0;i<li.length;i++){

li[i].style.background = 'pink'

}

}

</script>

2017-12-24_192704.png

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