abstract：<!doctype html><html><head><meta charset="utf-8"><title>JS-demo</title><style>#box{width:300px;height:300px; background:#D11619;}</style></
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>JS-demo</title>
<style>
#box{width:300px;height:300px; background:#D11619;}
</style>
</head>
<body>
<div id="box"></div>
<input type="button" value="变高" onClick="aa()">
<input type="button" value="变矮" onClick="bb()">
<input type="button" value="变色" onClick="cc()">
<input type="button" value="重置" onClick="dd()">
<input type="button" value="隐藏" onClick="ee()">
<input type="button" value="显示" onClick="ff()">
</body>
<script type="application/javascript">
var box
window.onload=function(){
box=document.getElementById('box')
}
function aa(){
box.style.height="400px"//属性里不能加分号，一开始遇到这个错误。
}
function bb(){
box.style.width="400px"
}
function cc(){
box.style.background="pink"
}
function dd(){
box.style.height="300px"
box.style.width="300px"
box.style.background="#D11619"
}
function ee(){
box.style.display="none"
}
function ff(){
box.style.display="block"
}
</script>
</html>
Correcting teacher：韦小宝Correction time：2019-03-14 09:06:56
Teacher's summary：写的很不错 使用JavaScript动态的来修改标签的样式还可以做成动画的效果