js技巧

弹出div，显示提示

function reloadcache(){
   showWaiting("");
}    
function showWaiting(msg){
    if(msg==null||msg=="") {
        msg = "<font style='font-size:16px'>系统处理中,请稍候</font>";
    }
    var obj=document.getElementById("waiting");
    if(!obj){
        var oBody = document.body;
        oBody.insertAdjacentHTML("beforeEnd", "<div id='waiting'></div>");
        obj=document.getElementById("waiting");
    }

    var str="";
    str="<div id=transparent oncontextmenu='return false' onselectstart='return false' "
    + "style=\"position:absolute; 100%;height:100%; top:expression(this.offsetParent.scrollTop); z-index:1; padding:10px; background:#ffffff;filter:alpha(opacity=50); text-align:center;\"> </div>"
    + "<div style=\"position:absolute;280px;height:65px; z-index:2;left:expression((document.body.clientWidth-200)/2);top:expression(this.offsetParent.scrollTop + 130); border:1px solid #666666; padding:20px 20px 20px 40px; background:#E4E4E4; \"> "
    + "&nbsp;"
    + msg + "</div>";
    obj.innerHTML=str;
    setTimeout("stopWaiting()","5000");//提示显示多长时间 
}

function stopWaiting(){
    document.getElementById("waiting").innerHTML="";
}