/**         * 等待层         */        setWaitPanel:function(){            if(document.getElementById("loader_container")!=null){                return;            }                        var sWidth = document.body.offsetWidth;            var sHeight = document.body.scrollHeight;            panel = document.createElement("div");            panel.setAttribute(‘id‘, ‘bgDiv‘);            panel.setAttribute(‘class‘, ‘msgCover‘);            panel.style.width = sWidth + "px";            panel.style.height = sHeight + "px";            document.body.appendChild(panel);                        obj1 = document.createElement("div");            obj1.setAttribute("id","loader_container");                        var obj2 = document.createElement("div");            obj2.setAttribute("id", "loader");            document.body.appendChild(obj1);            document.getElementById("loader_container").appendChild(obj2);                        var obj3 = document.createElement("div");            obj3.setAttribute("id","load_img");            document.getElementById("loader").appendChild(obj3);                        var obj4 = document.createElement("div");            obj4.setAttribute("id","load_msg");            obj4.innerHTML = "载入中...";            document.getElementById("loader").appendChild(obj4);        },                /**         * 清除等待层         */        clearWaitPanel:function(){            document.body.removeChild(panel);             document.body.removeChild(obj1);        }    };=================================提交时设置等待层，显示数据后清除等待层.msgCover {    background: none repeat scroll 0 0 #777;    opacity: 0.65;    position: absolute;    top: 0;    left: 0;    z-index: 10000;}#loader_container {    text-align: center;    position: absolute;    top: 200px;    width: 100%;    left: 0;    z-index: 10001;}#loader {    font-size: 11.5px;    background-color: #FFFFFF;    padding: 10px 0;    margin: 0 auto;    height: 18px;    width: 120px;    border: 1px solid #5a667b;    z-index: 2;    -moz-border-radius: 5px;    -webkit-border-radius: 5px;}#load_img {    background-image: url("../images/wait.gif");    background-size: 16px 16px;    background-repeat: no-repeat;    float: left;    height: 22px;    margin: 2px 0 0 10px;    width: 23px;}#load_msg {    float: left;    margin: 3px 0;}============用法=============提交后设置等待层    SA.setWaitPanel();数据响应返回后清除等待层    SA.clearWaitPanel();