jQuery实现点击查看大图并以弹框的形式居中

*{margin:0;padding:0;}
.tab_bg{display:none;width:100%;height:100%;background:#282829;z-index:99;position:absolute;}
.tab_img{width:100px;height:100px;margin:20px;}
.tab_img img{width:100%;height:100%;}
.bigImg{display:none;width:300px;height:300px;z-index:999;position:absolute;left:50%;margin-top:-150px;margin-left:-150px;}
.bigImg img{width:100%;height:100%;}
.close{display:none;width:20px;height:20px;border-radius:100%;border:1px solid #ccc;text-align:center;cursor:pointer;position:absolute;right:10px;top:10px;z-index:999;color:#fff}
li{height:300px;}

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var $height=$(window).height();
$(".tab_bg").height($height);
function imgEnlarge(small){
$(small).on("click",function(){
var $big=document.createElement("div");
$($big).attr("class","bigImg");
$($big).appendTo($("body"));
var $img=document.createElement("img");
$($img).attr("src",$(this).find("img").attr("src"));
$($img).appendTo($big);
$(this).css("display","none");
$(".tab_bg").css("display","block");
$(".close").css("display","block");
$($big).fadeIn();
$(window).bind("scroll",function(){return false});
var top1=$(window).scrollTop();
$(window).scrollTop(top1);
$(".tab_bg").css("top",top1);
$("body").css("overflow","hidden");
$(".bigImg").css("top",top1+$height/2);
});
$(".close").on("click",function(){
$(this).css("display","none");
$(small).css("display","block");
$(".tab_bg").css("display","none");
$(".bigImg").css("display","none");
$("body").css("overflow","auto");
})
}
$(".tab_img").each(function(){
imgEnlarge($(this));
})