//css

* {

margin

:

0

;

padding

:

0

;}

#imglist {

list-style

:

none

;

width

:

500px

;

margin

:

50px

auto

;}

#imglist li {

float

:

left

;

margin-top

:

10px

;}

html代码

<

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

>

         

<

ul

id

=

"imglist"

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/1.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/2.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/3.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/4.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/5.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/6.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/7.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/8.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/9.jpg"

width

=

"500px"

/></

li

>

    

<

li

><

img

class

=

"pimg"

src

=

"img/10.jpg"

width

=

"500px"

/></

li

>

</

ul

>

<

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);

        

});

    

});

</

script

>

//juery方法

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"

);

    

});

}