????：<!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="變高" onclick="aa()">
<input type="button" value="變寬" onclick="bb()">
<input type="button" value="變色" onclick="cc()">
<input type="button" value="重置" onclick="dd()">
<input type="button" value="隱藏" onclick="ee()">
<input type="button" value="顯示" onclick="ff()">
<script type="text/javascript">
var box
window.onload=function(){
box=document.getElementById('box')
}
function aa(){
box.style.height="400px" //改變高度
}
function bb(){
box.style.width="400px" //改變寬度
}
function cc(){
box.style.background="pink" //改變顏色
}
function dd(){
box.style.height="100px" //改變顏色
box.style.width="100px"
box.style.background="red"
}
function ee(){
box.style.display="none"
}
function ff(){
box.style.display="block"
}
</script>
</body>
</html>
?? ???：天蓬老師?? ??：2019-01-05 09:36:14
???? ??：最重要的你沒(méi)有寫: getElementsByTagName()