//遮罩        function coverDiv(){            var procbg = document.createElement("div"); //首先创建一个div            procbg.setAttribute("id","mybg"); //定义该div的id            procbg.style.background = "#000000";            procbg.style.width = "100%";            procbg.style.height = "100%";            procbg.style.position = "fixed";            procbg.style.top = "0";            procbg.style.left = "0";            procbg.style.zIndex = "500";            procbg.style.opacity = "0.6";            procbg.style.filter = "Alpha(opacity=70)";            document.body.appendChild(procbg);        }        //取消遮罩        function hide() {            /* document.getElementById('light').style.display="none"; */            $("div[class='xucun_content']").hide();            var body = document.getElementsByTagName("body");            var mybg = document.getElementById("mybg");            body[0].removeChild(mybg);        }