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jQuery如何实现滑入滑出效果（跟随鼠标滑入滑出蒙板）

2018-01-23 20:29 573 查看

效果图：

代码：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
*{
margin:0;
padding:0;
list-style: none
}

#box{
position:relative;
margin: 100px auto;
width:300px;
height:400px;
background-image:url(img/timg1.jpg);
background-size:300px 400px;
border:1px solid black;
overflow: hidden;
}
#zzc{
position: absolute;
width: 300px;
height: 400px;
background-color: red;
opacity:0.4;
left:-20000px;
}
</style>
</head>
<body style="height:1000px; width:1000px;">

<div id="box">
<div id="zzc"></div>
</div>

</body>
</html>

<script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>
<script type="text/javascript">
function inDirection(evt) {
//1、拿出鼠标距离四个边的距离
//1)、盒子left，top，right，bottom
let left= $("#box").offset().left;
let top = $("#box").offset().top;
let right = left+$("#box").width();
let bottom = top+$("#box").height();

//2)、计算鼠标距离每个边的距离
let leftDis =Math.abs(left-evt.pageX);
let rightDis =Math.abs(right-evt.pageX);
let topDis =Math.abs(top-evt.pageY);
let bottomDis =Math.abs(bottom-evt.pageY);

let obj = {
"左":leftDis,
"上":topDis,
"右":rightDis,
"下":bottomDis
}
let min = obj["左"];
let minKey = "左";
for(let key in obj){
if(obj[key]<min){
min = obj[key];
minKey = key;
}
}
return minKey;
}

function leftIn() {
$("#zzc").css({"left":-300});
$("#zzc").animate({"left":0,"top":0},200);
}

function rightIn() {
$("#zzc").css({"left":300});
$("#zzc").animate({"left":0,"top":0},200);
}

function upIn() {
$("#zzc").css({"top":-400});
$("#zzc").animate({"left":0,"top":0},200);
}

function bottomIn() {
$("#zzc").css({"top":400});
$("#zzc").animate({"left":0,"top":0},200);
}

function leftOut() {
$("#zzc").animate({"left":-300,"top":0},200);
}

function rightOut() {
$("#zzc").animate({"left":300,"top":0},200);
}

function upOut() {
$("#zzc").animate({"left":0,"top":-400},200);
}

function bottomOut() {
$("#zzc").animate({"left":0,"top":400},200);
}

let inFuncObj ={
"左":leftIn,
"上":upIn,
"右":rightIn,
"下":bottomIn
};

let outFuncObj ={
"左":leftOut,
"上":upOut,
"右":rightOut,
"下":bottomOut
};

$(function () {
$("#box").mouseenter(function (evt) {
let direction = inDirection(evt);
console.log("从"+direction+"边进入");
inFuncObj[direction]();
});

$("#box").mouseleave(function (evt) {
let direction = inDirection(evt);
console.log("从"+direction+"边出去");
outFuncObj[direction]();
});
});

</script>

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标签： jQuery 特效滑入滑出

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