jQuery根据鼠标进入的方位出现动画遮罩效果
分类：实例代码
本章节分享一段代码实例，它实现了根据鼠标进入的方位，来决定遮罩层动画的展现效果。
这是一种比较灵活和生动的遮罩层效果，需要的朋友可以做一下参考。
代码实例如下:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.pipipi.net/" />
<title>前端教程网</title>
<style>
body, a {
text-align: center;
color: white;
text-decoration: none;
}
.hover-slideout {
display: inline-block;
margin-top: 10%;
width: 300px;
height: 300px;
background: pink;
overflow: hidden;
position: relative;
}
.smelly-cat {
position: absolute;
width: 100%;
height: 100%;
background: rgba(255,0,0,.5);
top: -100%;
left: -100%;
}
h1 {
font-size: 3em;
}
</style>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script>
$(function(){
$('[hover-slideout]').each(function(){
$(this).hover(function(e){
$(this).find('[smelly-cat]').css(induction_position($(this), e)).stop(true, true).animate({
"left":0,
"top":0
}, 200);
},function(e){
$(this).find('[smelly-cat]').stop(true, true).animate(induction_position($(this), e), 200);
});
});
function induction_position(elem, e){
var w = elem.width(), h = elem.height(), direction=0, obj={};
var x = (e.pageX - elem.offset().left - (w / 2)) * (w > h ? (h / w) : 1);
var y = (e.pageY - elem.offset().top - (h / 2)) * (h > w ? (w / h) : 1);
direction = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180) / 90) + 3) % 4;
switch(direction){
case 0:
obj.left = 0;
obj.top = "-100%";
break;
case 1:
obj.left = "100%";
obj.top = 0;
break;
case 2:
obj.left = 0;
obj.top = "100%";
break;
case 3:
obj.left = "-100%";
obj.top = 0;
break;
}
return obj;
}
});
</script>
</head>
<body>
<div class="hover-slideout" hover-slideout>
<h1>鼠标从不同方位进入</h1>
<div class="smelly-cat" smelly-cat>
<br />
<br />
<br />
<h1>Smelly Cat</h1>
<br />
<br />
<br />
<br />
<a href="http://www.pipipi.net" target="_blank">前端教程网</a>
</div>
</div>
</body>
</html>
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