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老师批语：
attr方法:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<img src="../images/jsy.jpg" width="200" alt="美女" title="明星" id="pic" data-nation="中国">
</body>
<script type="text/javascript" src="../js/jquery-3.3.1.js"></script>
<script type="text/javascript">
var res = $('#pic').attr('src')//获取当前属性值,单参数是获取
//双参数为获取,第一个是属性名,第二个是要设置的新值
$('#pic').attr('src','../images/gyy.jpg')
$('#pic').attr('style','border-radius:50%;box-shadow:2px 2px 2px #888')
var res = $('#pic').attr('data-nation')
//回调函数
$('#pic').attr('width',function(){return 100+90})
var res=$('#pic').attr('width')
//2. removeAttr():删除元素的属性
$('#pic').removeAttr('style')
//删除多个属性
var res=$('#pic').removeAttr('alt title data-nation')
console.log(res)
</script>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.box1 {
width: 300px;
height: 300px;
background-color: wheat;
position: relative;
}
.box2 {
width: 100px;
height: 100px;
background-color: coral;
position: absolute;
top: 50px;
left: 100px;
}
</style>
</head>
<body>
<img src="../images/jsy.jpg">
<div class="box1">
<div class="box2"></div>
</div>
</body>
<script type="text/javascript" src="../js/jquery-3.3.1.js"></script>
<script type="text/javascript">
//1设置css样式(name,value)
var res = $('img').css('width',200)
var res = $('img').css('border-radius','50%')
var res =$('img').css('box-shadow','2px 2px 2px #888')
//width()和height()方法
var res = $('img').css('width',500)
var res = $('img').css('height',900)
//获取元素的位置:offset(),返回的是一个对象
var res = $('img').offset()
//.查看绝对定位元素的偏移量: position()
var res = $('.box2').position().left
var res = $('.box2').position().top
console.log(res)
</script>
</html>点击 "运行实例" 按钮查看在线实例
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