<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
</head>
<style>
html,body,.cover{margin:0;height:100%;width: 100%;}
img{height:100px;width:100px;position:relative;display:block;margin:0 auto;}
.cover{background-color:rgba(0, 0, 0, 1);position:fixed;top: 0;left:0;display:none;}
.bg-animation{animation: bg 0.4s;-webkit-animation: bg 0.4s;display:block !important;}
@keyframes bg
{
from {background: rgba(0, 0, 0, 0);}
to {background: rgba(0, 0, 0, 1);}
}
@-webkit-keyframes bg /* Safari 和 Chrome */
{
from {background: rgba(0, 0, 0, 0);}
to {background: rgba(0, 0, 0, 1);}
}
</style>
<body>
<img src="img/pb1.jpg" alt="" class='img'>
<img src="img/pb2.jpg" alt="" class='img'>
<img src="img/pb3.jpg" alt="" class='img'>
<img src="img/db4.jpg" alt="" class='img'>
<div class="cover"></div>
</body>
<script src="preview.js"></script>
<script>
preView.init('.img','.cover');
</script>
</html>
(function(doc,win){
var preview = function(){
this.win_w=doc.body.offsetWidth; //屏幕宽度
this.win_h=doc.documentElement.clientHeight; //屏幕高度
this.index=1;
}
preview.prototype.init = function(selector,c_selector){
this.el=$$(selector);
var pre=this;
function large(){
var trans="0.4s cubic-bezier(0.42, 0, 0.61, 0.75)";
this.style.webkitTransition=trans;
if(this.className.indexOf('iamlarge')==-1){
this.className+=' iamlarge';
var scroll_top=doc.body.scrollTop; //滚动条上卷高度
this.style.transition=trans;
(function(){
var scale= pre.win_w>650?650/this.width:pre.win_w/this.width;
var imgeh=this.height*scale;
var move_y=((pre.win_h-this.height)/2-this.offsetTop+scroll_top)/scale;
var move_x=((pre.win_w-this.width)/2-this.offsetLeft)/scale;
var tran="scale("+scale+","+scale+") translate3d("+move_x+"px,"+move_y+"px,0)";
$$(c_selector)[0].className+=" bg-animation";
this.style.zIndex=pre.index;
this.style.transform=tran;
this.style.webkitTransform=tran;
pre.index++;
}.call(this))
}else{
this.className=this.className.replace(' iamlarge','');
var tran="scale(1,1) translate3d(0,0,0)";
this.style.transform=tran;
this.style.webkitTransform=tran;
$$(c_selector)[0].className=$$(c_selector)[0].className.replace(' bg-animation','');
setTimeout(function(){
this.style.zIndex='auto';
}.bind(this),400);
}
}
for(var i=0;i<this.el.length;i++){
this.el[i].addEventListener('click',large);
}
}
function $$(sel){
return doc.querySelectorAll(sel);
}
return preView = new preview();
})(document,window)
