jquery开发查看大图功能实现代码

代码如下:

/*查看大图*/
var screenheight = $(window).height();
var screenwidth = $(window).width();
var loadcss = function(){
var screenwidth = $(window).width();
var screenheight = $(window).height();
$("p.lookbigpicture").css({"left":screenwidth*0.2,"top":screenheight*0.15+$(document).scrolltop(),
"width":screenwidth*0.6,"height":screenheight*0.7});
$("img.bigimg").css({"max-width":(screenwidth*0.6 - 30),"max-height":screenheight*0.7-40});
$("img.bigimg").load(function(){
$("img.bigimg").css("top",(screenheight*0.7 - 30 - $("img.bigimg").height())*0.5 + 30);
});
$("img.bigimg").css("top",(screenheight*0.7 - 30 - $("img.bigimg").height())*0.5 + 30);
$.log("$(document).height():"+$(document).height());
};
$("a#bigpic").click(function(){
$.log("screenheight:"+screenheight+"screenwidth:"+screenwidth);
str = $("img[img-size]").attr("src");
$("body").append("<p class='grey'></p>");//灰色底层
$("body").append("<p class='lookbigpicture'><span class='protopic'><a z-index='20001' target='_blank' href='"+str+"'>查看原图</a></span><a href='javascript：;' class='bigpicclose' title='关闭'>×</a><img class='bigimg' src='"+str+"'/></p>");
$("p.grey").css( "height",$(document).height());
loadcss();
$("body").css({overflow:"hidden"}); //禁用滚动条
});
$("body").delegate("p.grey,a.bigpicclose","click",function(){
$("body").css({overflow:"visible"}); //恢复滚动条
$("p.lookbigpicture").remove();
$("p.grey").remove();
});
//当窗口大小改变时
$(window).resize(function () {
loadcss();
});

. 代码如下:

/***遮罩层****/
.grey {
background: #000;
display: block;
z-index: 1000;
width: 100%;
position: absolute;
filter: alpha(opacity : 50);
opacity: 0.5;
top: 0;
left: 0;
top: 0;
}

.lookbigpicture {
border: #000 solid 1px;
position: absolute;
z-index: 2000;
text-align: center;
background: black;
}

.bigimg {
margin-left: auto;
margin-right: auto;
position: relative;
}

.bigpicclose {
position: absolute;
width: 36px;
height: 36px;
font-size: 0;
z-index: 20001;
top: -18px;
right: -18px;
background:
url("https://img.t.sinajs.cn/t5/style/images/layer/multipic_ico.png?id=20131018174500")
0 0 no-repeat;
}

.lookbigicn {
display: inline-block;
width: 12px;
height: 12px;
background:
url("https://img.t.sinajs.cn/t5/style/images/common/icon.png?id=1383027536816")
-175px -25px no-repeat;
vertical-align: -2px;
margin-left: 20px;
}

.w_ico12 {
display: inline-block;
width: 12px;
height: 12px;
background:
url("https://img.t.sinajs.cn/t5/style/images/common/icon.png?id=1383027536816")
-175px 0px no-repeat;
vertical-align: -2px;
}

.protopic {
position: absolute;
display: inline-block;
height: 30px;
top: 10px;
right: 50px;
overflow: hidden;
cursor: pointer;
color: #f8f8f8;
text-shadow: 0 1px 0 rgba(0, 0, 0, .5);
}

. 代码如下:

<p pic-choice style="display: none;">
<em class="w_ico12"></em><a href="javascript：;" id="hidepic">收起</a>
<em class="lookbigicn"></em><a href="javascript：;" id="bigpic">查看大图</a>
</p>