遮罩层:
css里加
.loadingWrap{
position:fixed;
top:0;
left:0;
width:100%;
height:100%;
z-index:300;
background-image:url(../img/loading2.gif);
background-repeat:no-repeat;
background-position:center center;
background-color:#000;
background-color:rgba(234, 229, 229, 0.5);
filter:alpha(opacity=50);
}
js
$('<div class="loadingWrap"></div>').appendTo("body");
$(".loadingWrap").remove();
防重复提交: