能够感知鼠标移动方位的遮罩层效果代码实例
分类：实例代码
分享一段代码实例，它实现了感知鼠标移动方位的遮罩层效果。
也就是是遮罩层的出现和鼠标进入的方位是一致的。
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>
* {
margin: 0;
padding: 0;
}
ul {
width: 630px;
overflow: hidden;
margin: 100px auto;
}
li {
float: left;
width: 200px;
height: 200px;
background: #ccc;
margin: 5px;
position: relative;
overflow: hidden;
}
li span {
position: absolute;
top: 0;
left: 200px;
width: 100%;
height: 100%;
background: rgba(255,0,0,0.3);
}
li span p {
font-size: 14px;
color: #fff;
padding: 10px;
white-space: pre-wrap;
}
</style>
<script>
function getStyle(obj, name) {
if (obj.currentStyle) {
return obj.currentStyle[name];
} else {
return getComputedStyle(obj, false)[name];
}
}
function move(obj, json, options) {
options = options || {};
options.duration = options.duration || 700;
options.easing = options.easing || 'ease-in';
var count = Math.floor(options.duration / 30);
var start = {};
var dis = {};
for (var name in json) {
start[name] = parseFloat(getStyle(obj, name));
dis[name] = json[name] - start[name];
}
var n = 0;
clearInterval(obj.timer);
obj.timer = setInterval(function() {
n++;
for (var name in json) {
switch (options.easing) {
case 'linear':
var cur = start[name] + dis[name] * n / count;
break;
case 'ease-in':
var a = Math.pow(n / count, 3);
var cur = start[name] + dis[name] * a;
break;
case 'ease-out':
var a = Math.pow(1 - n / count, 3);
var cur = start[name] + dis[name] * (1 - a);
break;
}
if (name == 'opacity') {
obj.style[name] = cur;
obj.style.filter = 'alpha(opacity:' + (cur * 100) + ')';
} else {
obj.style[name] = cur + 'px';
}
}
if (n == count) {
clearInterval(obj.timer);
options.complete && options.complete();
}
}, 30);
}
function a2d(n) {
return n * 180 / Math.PI;
}
function hoverDir(obj, ev) {
var a = ev.clientX - (obj.offsetLeft + obj.offsetWidth / 2);
var b = obj.offsetTop + obj.offsetHeight / 2 - ev.clientY;
return Math.round((a2d(Math.atan2(b, a)) + 180) / 90) % 4;
}
function through(obj) {
obj.onmouseenter = function(ev) {
var oEvent = ev || event;
var oS = this.children[0];
var dir = hoverDir(obj, oEvent);
switch (dir) {
case 0:
oS.style.left = '-200px';
oS.style.top = 0;
break;
case 1:
oS.style.left = 0;
oS.style.top = '200px';
break;
case 2:
oS.style.left = '200px';
oS.style.top = 0;
break;
case 3:
oS.style.left = 0;
oS.style.top = '-200px';
break;
}
move(oS, {
left: 0,
top: 0
}, {
duration: 300,
easeing: 'linear'
});
}
obj.onmouseleave = function(ev) {
var oEvent = ev || event;
var oS = this.children[0];
var dir = hoverDir(obj, oEvent);
switch (dir) {
case 0:
move(oS, {
left: -200,
top: 0
}, {
duration: 300,
easing: 'linear'
});
break;
case 1:
move(oS, {
left: 0,
top: 200
}, {
duration: 300,
easing: 'linear'
});
break;
case 2:
move(oS, {
left: 200,
top: 0
}, {
duration: 300,
easing: 'linear'
});
break;
case 3:
move(oS, {
left: 0,
top: -200
}, {
duration: 300,
easing: 'linear'
});
break;
}
};
}
window.onload = function() {
var oLi = document.getElementsByTagName("li");
for (var i = 0; i < oLi.length; i++) {
through(oLi[i])
}
}
</script>
</head>
<body>
<ul>
<li><span><p>前端教程网欢迎您</p></span></li>
<li><span><p>前端教程网欢迎您</p></span></li>
<li><span><p>前端教程网欢迎您</p></span></li>
<li><span><p>前端教程网欢迎您</p></span></li>
<li><span><p>前端教程网欢迎您</p></span></li>
<li><span><p>前端教程网欢迎您</p></span></li>
</ul>
</body>
</html>
能够感知鼠标移动方位的遮罩层效果代码实例，这样的场景在实际项目中还是用的比较多的，关于能够感知鼠标移动方位的遮罩层效果代码实例就介绍到这了。
能够感知鼠标移动方位的遮罩层效果代码实例属于前端实例代码，有关更多实例代码大家可以查看。