如何通过css选择器来获取元素
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>如何通过css选择器来获取元素</title>
<script type="text/javascript"></script>
</head>
<body>
<ul id="ul">
<li class="green">表格0</li>
<li>表格1</li>
<li class="green">表格2</li>
<li class="pink">表格3</li>
<li class="red">表格4</li>
<li class="green">表格5</li>
</ul>
<script>
//选择页面元素
let lists =document.querySelectorAll('li');
lists[3].style.backgroundColor='coral'
lists.item(4).style.backgroundColor='lightblue'
//元素上调用
let ul=document.querySelector('#ul');
let li=ul.querySelectorAll('.green')
for (let i=0; i< li.length;i++){
li[i].style.backgroundColor='green'
}
</script>
</body>
</html>