放大镜

<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
* {
margin: 0;
padding: 0;
}

.box {
width: 350px;
height: 350px;
margin: 100px;
border: 1px solid #ccc;
position: relative;
}

.big {
width: 400px;
height: 400px;
position: absolute;
top: 0;
left: 360px;
border: 1px solid #ccc;
overflow: hidden;
display: none;
}

.mask {
width: 175px;
height: 175px;
background: rgba(255, 255, 0, 0.4);
position: absolute;
top: 0;
left: 0;
cursor: move;
display: none;
}

.small {
position: relative;
}
</style>
</head>
<body>
<div class="box" id="box">
<div class="small">
<img src="images/001.jpg" width="350" alt=""/>

<div class="mask"></div>
</div>
<div class="big">
<img src="images/0001.jpg" width="800" alt=""/>
</div>
</div>
</body>
</html>
<script>
//获取元素
var box = document.getElementById("box");
var small = box.children[0];
var mask = small.children[1];
var big = box.children[1];
var bigImg = big.children[0];
//alert(box.offsetLeft);

//鼠标经过small盒子显示遮罩和大盒子鼠标离开small盒子隐藏遮罩和大盒子
small.onmouseover = function () {
mask.style.display = "block";
big.style.display = "block";
}
small.onmouseout = function () {
mask.style.display = "none";
big.style.display = "none";
}

//鼠标在small盒子上移动 mask跟随
small.onmousemove = function (event) {
var event = event || window.event;
//鼠标在页面上的座标
var pageX = event.pageX || event.clientX + document.documentElement.scrollLeft;
var pageY = event.pageY || event.clientY + document.documentElement.scrollTop;

//盒子的位置
var boxX = box.offsetLeft;
var boxY = box.offsetTop;

//鼠标在盒子中的位置
var mouseX = pageX - boxX;
var mouseY = pageY - boxY;

//mask应该在的位置
var maskX = mouseX - mask.offsetWidth / 2;
var maskY = mouseY - mask.offsetHeight / 2;

if (maskX < 0) {
maskX = 0;
}
if (maskX > small.offsetWidth - mask.offsetWidth) {
maskX = small.offsetWidth - mask.offsetWidth;
}
if (maskY < 0) {
maskY = 0;
}
if (maskY > small.offsetHeight - mask.offsetHeight) {
maskY = small.offsetHeight - mask.offsetHeight;
}

console.log("maskX: " + maskX + "maskY: " + maskY);

//mask的位置进行设定
mask.style.left = maskX + "px";
mask.style.top = maskY + "px";

//大图在大盒子里移动的距离 / 遮罩在小图里移动的距离
var bigImgToMove = bigImg.offsetWidth - big.offsetWidth;
var maskToMove = small.offsetWidth - mask.offsetWidth;

var bili = bigImgToMove / maskToMove;

bigImg.style.marginLeft = -bili * maskX + "px";
bigImg.style.marginTop = -bili * maskY + "px";

}

</script>

posted @ 2016-04-25 14:45 _小女人阅读(132) 评论(0) 收藏举报

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