abstrak：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>如何通過(guò)css選擇器來(lái)獲取元素</title> <script type="text/javascript"></script></head&
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>如何通過(guò)css選擇器來(lái)獲取元素</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>
//選擇頁(yè)面元素
let lists =document.querySelectorAll('li');
lists[3].style.backgroundColor='coral'
lists.item(4).style.backgroundColor='lightblue'
//元素上調(diào)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>
Guru membetulkan：韋小寶Masa pembetulan：2018-12-15 11:36:10
Rumusan guru：寫(xiě)的不錯(cuò)！簡(jiǎn)潔而并不簡(jiǎn)單！課后記得多練習(xí)！選擇器是非常重要的！不管是css還是js、jquery都是離不開(kāi)選擇器的！