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js效果：指定div中图片点击放大，再次点击关闭
<html>
<head>
<style>
.over {position: fixed; left:0; top:0; width:100%; z-index:100;}
.tempContainer {position:fixed; width:100%; margin-right:0px; margin-left:0px; text-align:center; z-index:101;}
</style>
<script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
</head>
<body>
<div class="over"></div><!--背景层-->
<div class="logoImg amplifyImg"><!--注意：此处的amlifyImg不可少-->
<img src="http://dd.cn/uploads/images/20230509/ad7684cfe436f03750fe704ba99ae188.jpg"/><!-- 此处是引入图片的路径 -->
</div>
<script>
$(document).ready(function () {
var imgsObj = $('.amplifyImg img');//需要放大的图像
if(imgsObj){
$.each(imgsObj,function(){
$(this).click(function(){
var currImg = $(this);
coverLayer(1);
var tempContainer = $('<div class=tempContainer></div>');//图片容器
with(tempContainer){//width方法等同于$(this)
appendTo("body");
var windowWidth=$(window).width();
var windowHeight=$(window).height();
//获取图片原始宽度、高度
var orignImg = new Image();
orignImg.src =currImg.attr("src") ;
var currImgWidth= orignImg.width;
var currImgHeight = orignImg.height;
if(currImgWidth<windowWidth){//为了让图片不失真，当图片宽度较小的时候，保留原图
if(currImgHeight<windowHeight){
var topHeight=(windowHeight-currImgHeight)/2;
if(topHeight>35){/*此处为了使图片高度上居中显示在整个手机屏幕中：因为在android,ios的微信中会有一个title导航，35为title导航的高度*/
topHeighttopHeight=topHeight-35;
css('top',topHeight);
}else{
css('top',0);
}
html('<img border=0 src=' + currImg.attr('src') + '>');
}else{
css('top',0);
html('<img border=0 src=' + currImg.attr('src') + ' height='+windowHeight+'>');
}
}else{
var currImgChangeHeight=(currImgHeight*windowWidth)/currImgWidth;
if(currImgChangeHeight<windowHeight){
var topHeight=(windowHeight-currImgChangeHeight)/2;
if(topHeight>35){
topHeighttopHeight=topHeight-35;
css('top',topHeight);
}else{
css('top',0);
}
html('<img border=0 src=' + currImg.attr('src') + ' width='+windowWidth+';>');
}else{
css('top',0);
html('<img border=0 src=' + currImg.attr('src') + ' width='+windowWidth+'; height='+windowHeight+'>');
}
}
}
tempContainer.click(function(){
$(this).remove();
coverLayer(0);
});
});
});
}
else{
return false;
}
//使用禁用蒙层效果
function coverLayer(tag){
with($('.over')){
if(tag==1){
css('height',$(document).height());
css('display','block');
css('opacity',1);
css("background-color","#FFFFFF");
css("background-color","rgba(0,0,0,0.7)" ); //蒙层透明度
}
else{
css('display','none');
}
}
}
});
</script>
</body>
</html>
