<script type="text/javascript">
var obj = document.getElementById(id)
function style(obj){
obj.style = "font-size:30pxbackground:tealheight:900px"
obj.style = "font-size:100pxopacity:.67width:100px"
}
style(obj)
</script>
代码如下：<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Test</title>
<script src="http://pu-datacastle.oss-cn-qingdao.aliyuncs.com/master.third.source/js/jquery-2.1.4.min.js" type="text/javascript" charset="utf-8"></script>
<style>
*{
/*margin: 0px
padding: 0px*/
}
.test1{
width: 100%
height: 22px
line-height: 22px
border: 2px solid #ccc
}
</style>
</head>
<body>
<div class="test1">公告内容</div>
<br />
<button class="changestyle">更改样式</button>
<script>
$(function(){
$(".changestyle").off("click").on("click",function(){
$(".test1").css({
"font-size":"16px",
"font-weight":"bold",
"border":"2px solid blue",
"width":"200px",
"height":"100px",
"text-align":"center",
"line-height":"100px",
"color":"red"
})
})
})
</script>
</body>
</html>
望采纳！
