点击图片在弹出层显示大图

<!--HTML部分：-->

< td width= "350" >

< img height= "100" width= "100" class= "pimg" src= "http://img2.imgtn.bdimg.com/it/u=61392142,3898643530 & fm=27 & gp=0.jpg" />

< img height= "100" width= "100" class= "pimg" src= "http://img2.imgtn.bdimg.com/it/u=61392142,3898643530 & fm=27 & gp=0.jpg" />

< img height= "100" width= "100" class= "pimg" src= "http://img2.imgtn.bdimg.com/it/u=61392142,3898643530 & fm=27 & gp=0.jpg" />

</ td >

< div id= "outerdiv" style= "position:fixed;top:0;left:0;background:rgba(0,0,0,0.7);z-index:2;width:100%;height:100%;display:none;" >

< div id= "innerdiv" style= "position:absolute;" >

< img id= "bigimg" style= "border:5px solid #fff;" src= "" />

</ div >

</ div >

<!--JS部分：-->

< script >

$( function(){

$( ".pimg"). click( function(){

var _this = $( this); //将当前的pimg元素作为_this传入函数

imgShow( "#outerdiv", "#innerdiv", "#bigimg", _this);

});

});

function imgShow( outerdiv, innerdiv, bigimg, _this){

var src = _this. attr( "src"); //获取当前点击的pimg元素中的src属性

$( bigimg). attr( "src", src); //设置#bigimg元素的src属性

/*获取当前点击图片的真实大小，并显示弹出层及大图*/

$( "<img/>"). attr( "src", src). load( function(){

var windowW = $( window). width(); //获取当前窗口宽度

var windowH = $( window). height(); //获取当前窗口高度

var realWidth = this. width; //获取图片真实宽度

var realHeight = this. height; //获取图片真实高度

var imgWidth, imgHeight;

var scale = 0.8; //缩放尺寸，当图片真实宽度和高度大于窗口宽度和高度时进行缩放

if( realHeight> windowH* scale) { //判断图片高度

imgHeight = windowH* scale; //如大于窗口高度，图片高度进行缩放

imgWidth = imgHeight/ realHeight* realWidth; //等比例缩放宽度

if( imgWidth> windowW* scale) { //如宽度扔大于窗口宽度

imgWidth = windowW* scale; //再对宽度进行缩放

}

} else if( realWidth> windowW* scale) { //如图片高度合适，判断图片宽度

imgWidth = windowW* scale; //如大于窗口宽度，图片宽度进行缩放

imgHeight = imgWidth/ realWidth* realHeight; //等比例缩放高度

} else { //如果图片真实高度和宽度都符合要求，高宽不变

imgWidth = realWidth;

imgHeight = realHeight;

}

$( bigimg). css( "width", imgWidth); //以最终的宽度对图片缩放

var w = ( windowW- imgWidth)/ 2; //计算图片与窗口左边距

var h = ( windowH- imgHeight)/ 2; //计算图片与窗口上边距

$( innerdiv). css({ "top" :h, "left" :w}); //设置#innerdiv的top和left属性

$( outerdiv). fadeIn( "fast"); //淡入显示#outerdiv及.pimg

});

$( outerdiv). click( function(){ //再次点击淡出消失弹出层

$( this). fadeOut( "fast");

});

}

< / script >