JS实现 页面提交防刷新等待提示

 //关闭等待窗口
 function closediv() {
     //Close Div
     document.body.removeChild(document.getElementById("bgDiv"));
     document.getElementById("msgDiv").removeChild(document.getElementById("msgTitle"));
     document.body.removeChild(document.getElementById("msgDiv"));
 }
 //显示等待窗口
 function showdiv(str) {
     var msgw, msgh, bordercolor;
     msgw = 400; //提示窗口的宽度
     msgh = 100; //提示窗口的高度
     bordercolor = "#336699"; //提示窗口的边框颜色
     titlecolor = "#99CCFF"; //提示窗口的标题颜色   

     var sWidth, sHeight;
     sWidth = window.screen.availWidth;
     sHeight = window.screen.availHeight;  

     var bgObj = document.createElement("div");
     bgObj.setAttribute('id', 'bgDiv');
     bgObj.style.position = "absolute";
     bgObj.style.top = "0";
     bgObj.style.background = "#777";
     bgObj.style.filter = "progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
     bgObj.style.opacity = "0.6";
     bgObj.style.left = "0";
     bgObj.style.width = sWidth + "px";
     bgObj.style.height = sHeight + "px";
     document.body.appendChild(bgObj);
     var msgObj = document.createElement("div")
     msgObj.setAttribute("id", "msgDiv");
     msgObj.setAttribute("align", "center");
     msgObj.style.position = "absolute";
     msgObj.style.background = "white";
     msgObj.style.font = "12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
     msgObj.style.border = "1px solid " + bordercolor;
     msgObj.style.width = msgw + "px";
     msgObj.style.height = msgh + "px";
     msgObj.style.top = (document.documentElement.scrollTop + (sHeight - msgh) / 2) + "px";
     msgObj.style.left = (sWidth - msgw) / 2 + "px";
     var title = document.createElement("h4");
     title.setAttribute("id", "msgTitle");
     title.setAttribute("align", "right");
     title.style.margin = "0";
     title.style.padding = "3px";
     title.style.background = bordercolor;
     title.style.filter = "progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
     title.style.opacity = "0.75";
     title.style.border = "1px solid " + bordercolor;
     title.style.height = "18px";
     title.style.font = "12px Verdana, Geneva, Arial, Helvetica, sans-serif";
     title.style.color = "white";
     //title.style.cursor = "pointer";
     //title.innerHTML = "关闭";
     //title.onclick = closediv;
     document.body.appendChild(msgObj);
     document.getElementById("msgDiv").appendChild(title);
     var txt = document.createElement("p");
     txt.style.margin = "1em 0"
     txt.setAttribute("id", "msgTxt");
     txt.innerHTML = str;
     document.getElementById("msgDiv").appendChild(txt);
 }
 //屏蔽F5
 document.onkeydown = mykeydown;
 function mykeydown() {
     if (event.keyCode == 116) //屏蔽F5刷新键
     {
         window.event.keyCode = 0;
         return false;
     }
 }  

使用页面直接调用这个js文件，然后在按钮的onclick事件中填写：

<INPUT onclick="showdiv('表达数据提交中<br/>请稍候........ <br/> );"  type="button"  value="提交数据">

调用closediv()关闭