attr()和css()方法 2018-4-4 - jquery

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<!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>

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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>

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