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老师批语：
css手抄作业
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.box{
width: 200px;
height: 200px;
background-color: red;
position: relative;
}
.box1{
width: 100px;
height: 100px;
background-color: blue;
position: absolute;
top: 50px;
left: 50px;
}
</style>
</head>
<body>
<img src="./5.jpg">
<div class="box">
<div class="box1"></div>
</div>
</body>
</html>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
//css的样式设置 自带getter 和 setter
//var res = $('img').css('width','200')
//var res = $('img').css('border-radius','50%')
//var res = $('img').css('box-shadow','4px 4px 4px #333')
//
//链式操作
//var res = $('img').css('width','200')
//.('border-radius','50%')
//.('box-shadow','4px 4px 4px #333')
//jq操作
var res = $('img').css({'width':'200'
,'border-radius':'50%'
,'box-shadow':'4px 4px 4px #333'})
//var ras=$('img').css('width')
var res=parseInt($('img').css('width'))
res += 100
var res= $('img').css('width',res+'px')
var res = $('img').css('width')
//直接获取width() height()
var res = $('img').width()
var res = $('img').css('height')
var res = $('img').height('200')
var res = $('img').height('200')
var res = $('img').height('+=200')
//offset()
var res=$('img').offset()
var res=$('img').offset().left
//opsition
var res=$('box1').offset()
var res=$('box1').offset().left+=('')
//控制台输出
console.log(res)
</script>点击 "运行实例" 按钮查看在线实例
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