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HarmonyOS
在选项卡练习中设置botton的背景颜色不成功，查了很久也没看出究竟出来，请求各位大神帮忙看看到底是哪里漏了步骤，还是某些设置有冲突。。。
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title></head>
<style type="text/css">
#div1.active{
background: yellow;
}
#div1 div{
width: 200px;
height: 200px;
background:#222;
border: 1px solid #999;
display: none;
}</style>
<script type="text/javascript">
window.onload=function()
{
var oDiv=document.getElementById('div1');
var aBtn=oDiv.getElementsByTagName('input');
var aDiv=oDiv.getElementsByTagName('div');
for (var i = 0; i < aBtn.length; i++)
{
aBtn[i].onclick=function()
{
for (var i = 0; i < aBtn.length; i++)
{
aBtn[i].className='';
}
this.className='active';
};
};
};</script>
<body>
<div id="div1">
<input class="active" type="button" value="教育"/>
<input type="button" value="培训"/>
<input type="button" value="招生"/>
<input type="button" value="出国"/>
<div style="display: block;">1111</div>
<div>2222</div>
<div>3333</div>
<div>4444</div>
</div></body>
</html>
#div1.active=>#div1 .active看看 https://jsfiddle.net/chexian/...