abstract：<head><style type="text/css">#box{width: 100px;height: 100px;background:bisque}</style></head><body><div id="box"></div>
<head>
<style type="text/css">
#box{width: 100px;height: 100px;background:bisque}
</style>
</head>
<body>
<div id="box"></div>
<input type="button" value="变高" onclick="Alterheight()">
<input type="button" value="变宽" onclick="Alterwidth()">
<input type="button" value="变色" onclick="Altercolor()">
<input type="button" value="重置" onclick="Reset()">
<input type="button" value="隐藏" onclick="Hide()">
<input type="button" value="显示" onclick="Display()">
<script type="text/javascript">
var box
window.onload = function(){
box = document.getElementById('box')
}
function Alterheight(){
box.style.height = '500px'
}
function Alterwidth(){
box.style.width = "500px"
｝
function Altercolor(){
box.style.background = "red";
}
function Reset(){
box.style.height="100px";
box.style.width="100px";
box.style.background="bisque";
}
function Hide(){
box.style.display="none"
}
function Display(){
box.style.display="block"
}
</script>
</body>
Correcting teacher：查无此人Correction time：2019-02-15 09:19:22
Teacher's summary：完成的不错。js代码，每行结束要加上 ; 号。要养成习惯，因为上线的项目，需要把js文件压缩，这样用户访问时，请求的文件会小一些，速度快一些。继续加油。