abstract：<!DOCTYPE html><html><head><meta charset="UTF-8"><title>js来改变一下样式</title><style type="text/css">.box{width: 100px;height: 100px;background
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>js来改变一下样式</title>
<style type="text/css">
.box{width: 100px;height: 100px;background: red;margin-bottom:20px ;}
.boxx{width: 100px;height: 300px;background: red; }
.boxxx{width: 300px;height: 300px;background: blue; }
</style>
</head>
<body>
<div></div>
<input type="button" value="变高" onclick="bg(this)">
<input type="button" value="变宽" onclick="bk(this)">
<input type="button" value="变色" onclick="bs(this)">
<input type="button" value="重置" onclick="cz(this)">
<input type="button" value="隐藏" onclick="yc(this)">
<input type="button" value="显示" onclick="xs(this)">
<script type="text/javascript">
var box=document.getElementsByClassName('box')[0]
var box1=document.getElementsByTagName('div')[0]
function bg(num) {
box.className="boxx"
}
function bk(num) {
box.style.cssText="width: 200px;"
}
function bs(num) {
box1.style.background="blue"
}
function cz(num) {
box1.style.cssText="width: 100px;height: 100px;background: red;margin-bottom:20px ;"
}
function yc(num) {
box.style.display="none"
}
function xs(num) {
box.style.display="block"
}
</script>
</body>
</html>
Correcting teacher：查无此人Correction time：2019-04-08 16:04:39
Teacher's summary：完成的不错。每行js代码，后面增加;号。继续加油