摘要：<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Document</title><style type="text/css">#box{width: 100px; height: 100px;background
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
#box{
width: 100px; height: 100px;background:red;margin: 20px 80px;
}
</style>
</head>
<body>
<div id="box"></div>
<input type="button" value="变高" onclick="aa()">
<input type="button" value="变宽" 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()">
<script type="text/javascript">
var box
window.onload=function(){
box=document.getElementById('box')
}
function aa(){
box.style.height="400px" //改变高度
}
function bb(){
box.style.width="400px" //改变宽度
}
function cc(){
box.style.background="pink" //改变颜色
}
function dd(){
box.style.height="100px" //改变颜色
box.style.width="100px"
box.style.background="red"
}
function ee(){
box.style.display="none"
}
function ff(){
box.style.display="block"
}
</script>
</body>
</html>
批改老师：天蓬老师批改时间：2019-01-05 09:36:14
老师总结：最重要的你没有写: getElementsByTagName()
