abstract：<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,&
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style type="text/css">
#box{width:100px;height:100px;background:red;}
div{margin:20px 80px;}
</style>
</head>
<body>
<div class="" id="xx">
<img id="box" src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1547399382580&di=c3ee82baef71e4aafde9268e9820a740&imgtype=0&src=http%3A%2F%2Fwww.asiafinance.cn%2Fu%2Fcms%2Fwww%2F201612%2F13093246x6zz.jpg" alt="">
</div>
<input type="button" name="" value="变高" onclick="aa()">
<input type="button" name="" value="变宽" onclick="bb()">
<input type="button" name="" value="变色" onclick="cc()">
<input type="button" name="" value="重置" onclick="dd()">
<input type="button" name="" value="隐藏" onclick="ee()">
<input type="button" name="" value="显示" onclick="ff()">
<script type="text/javascript">
var box,xx
window.onload=function (){
box=document.getElementById('box')
xx=document.getElementById('xx')
}
function aa(){ //变高
box.style.height="300px"
}
function bb(){ //宽度
box.style.width="300px"
}
function cc(){ //改变颜色
box.style.background="pink"
}
function dd(){
box.style.width="100px"
box.style.height="100px"
box.style.background="red"
xx.style.display="";
}
function ee(){ //显示
xx.style.display="none";
}
function ff(){ //隐藏
xx.style.display="block";
}
</script>
</body>
</html>如果隐藏DIV的话，DIV里面的元素也会被一起隐藏。在实际项目中，我想这应该可以应用到很多地方。
Correcting teacher：韦小宝Correction time：2019-01-14 09:56:57
Teacher's summary：是的 实际上这些看似很基础的东西在实际项目中运用的场景还是很多的 基础要多练习才能牢牢掌握哦