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demo.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Js感应鼠标移入移出</title>
<link rel="stylesheet" href="./css/style.css">
</head>
<body>
<div class="wrap">
<div class="inner-img">
<div class="desc">
<p>2018</p>
新春快乐
狗年吉祥
</div>
</div>
<div class="inner-img">
<div class="desc">
<p>2018</p>
合家欢乐
</div>
</div>
<div class="inner-img">
<div class="desc">
<p>2018</p>
百福迎新
</div>
</div>
<div class="inner-img last-block">
<div class="desc">
<p>2018</p>
恭喜发财
</div>
</div>
<div class="inner-img">
<div class="desc">
<p>2018</p>
新春快乐
狗年吉祥
</div>
</div>
<div class="inner-img">
<div class="desc">
<p>2018</p>
合家欢乐
</div>
</div>
<div class="inner-img">
<div class="desc">
<p>2018</p>
百福迎新
</div>
</div>
<div class="inner-img last-block">
<div class="desc">
<p>2018</p>
恭喜发财
</div>
</div>
<div class="clear"></div>
</div>
</body>
<script src="./js/jquery-3.3.1.min.js"></script>
<script>
$(function(){
$(".wrap .inner-img").each(function(index){
var number = index%4;
$(this).css("background-image","url(./images/"+"0"+(number+1)+".png"+")");
});
});
//遮盖层的显示与隐藏
$(".inner-img").mouseenter(function(event){
//获取当前元素四边中心点坐标
// var left = $(this).offset().left;
// var top = $(this).offset().top;
var width = $(this)[0].clientWidth;
var height = $(this)[0].clientHeight;
var topPointer = {
x:Math.round(width/2),
y:0
},
rightPointer = {
x:Math.round(width),
y:Math.round(height/2)
},
bottomPointer = {
x:Math.round(width/2),
y:Math.round(height)
},
leftPointer = {
x:0,
y:Math.round(height/2)
};
var borderPointers = [topPointer,rightPointer,bottomPointer,leftPointer];
//获取鼠标进入当前元素的坐标
var currentPointer = {
x:event.offsetX,
y:event.offsetY
};
console.log("Direction: "+toDirection(width,height,currentPointer));
//重定位遮罩层
var pos = locateTopLayer(toDirection(width,height,currentPointer),width,height);
// $(selector).animate(styles,speed,easing,callback)
$(this).find(".desc").animate({
top:pos.top+"px",
left:pos.left+"px"
},1,"linear",function(){
$(this).animate({
top:0,left:0
},120,"linear");
});
});
$(".inner-img").mouseleave(function(){
var left = $(this)[0].clientWidth;
var top = $(this)[0].clientHeight;
var currentPointer = {
x:event.offsetX,
y:event.offsetY
};
var pos = locateTopLayer(toDirection(left,top,currentPointer),left,top);
console.log("leave: "+toDirection(left,top,currentPointer));
$(this).find(".desc").animate({
top:pos.top,
left:pos.left
},120,"linear");
});
//计算最小值，确定方向，上右下左分别时0,1,2,3
function toDirection(width,height,currentPointer){
var minIndex = 0,
halfWidth = Math.round(width/2),
halfHeight = Math.round(height/2);
var x = currentPointer.x,
y = currentPointer.y;
//将图片划分为四个区块，左上角区块
if(x <= halfWidth && y <= halfHeight){
return x > y ? 0 : 3;
}else if(x >= halfWidth && y <= halfHeight){
return (width - x) > y ? 0 : 1;
}else if(x >= halfWidth && y >= halfHeight){
return (width - x) > (height - y) ? 2 : 1;
}else if(x <= halfWidth && y >= halfHeight){
return x > (height - y) ? 2 : 3;
}else{
console.log("something error......");
// return 999;
}
}
//定位遮罩层函数
function locateTopLayer(directionIndex,width,height){
var position = {left:width,top:height};
if(directionIndex === 0){
position.left = 0;
position.top = -height;
}else if(directionIndex === 1){
position.top = 0;
}else if(directionIndex === 2){
position.left = 0;
}else if(directionIndex === 3){
position.top = 0;
position.left = -width;
}else{
console.log("获取方向索引有误");
}
return position;
}
</script>
</html>