关于document.write()方法

document.write()是容易让页面其他的内容变没有了。你可以用form.innerHTML += "<div></div>"这种方式实现啊

解决方案 »

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script language="javascript" type="text/JavaScript">
//首先定义两个数组，一个是菜单文字，一个是链接
    var MenuText = new Array(3);
    var MenuEven = new Array(3);
    MenuText[1] = ["菜单11","菜单12","菜单13"];
    MenuText[2] = ["菜单21","菜单21"];
    MenuText[3] = ["菜单31","菜单321","菜单33"];    MenuEven[1] = ["url11","url12","url13"];
    MenuEven[2] = ["url21","url22"];
    MenuEven[3] = ["url31","url32","url33"];
//初始化一个oPopup对象var  oPopup = window.createPopup();//这两个是获得表格绝对位置的方法，很有用的说
function getLeftIE(x,m) {
  var dx=0;
  if (x.tagName=="TD"){
    dx=x.offsetLeft;
  }
  else if (x.tagName=="TABLE") {
    dx=x.offsetLeft;
    if (m) { dx+=(x.cellPadding!=""?parseInt(x.cellPadding):2); m=false; }
  }
  return dx+(x.parentElement.tagName=="BODY"?0:getLeftIE(x.parentElement,m));
}
function getTopIE(x,m) {
  var dy=0;
  if (x.tagName=="TR"){
    dy=x.offsetTop;
  }
  else if (x.tagName=="TABLE") {
    dy=x.offsetTop;
    if (m) { dy+=(x.cellPadding!=""?parseInt(x.cellPadding):2); m=false; }
  }
  return dy+(x.parentElement.tagName=="BODY"?0:getTopIE(x.parentElement,m));
}//显示菜单
function ButtonClick(node,t)
{   alert("123");
   //首先得到鼠标所在的表格的位置
    var left = getLeftIE(node,true)-8;
    var top = getTopIE(node,true);
//定义打开的oPopup的宽度，高度
    var width = 90;
    var height = MenuText[t].length*20;
   // var width = 400;
   // var height = 100;
//清空oPopup的内容，否则每次调用都只会在后面接着写
    oPopup.document.body.innerHTML = "";
var b=document.getElementById("table1").innerHTML.toString();
//alert(b);
//alert(document.getElementById("table1").innerText.toString());
var c=document.getElementById("table1").innerText.toString();
    var oPopBody = oPopup.document.body;
    oPopup.show(left,top, width, height, document.body);
        oPopup.document.open;
//让oPopup在鼠标离开时自动隐藏。
        oPopup.document.write("<body leftmargin=0 topmargin=0 scroll=no style='border : 0 px;bgColor:#cccccc' onmouseover=clearTimeout(parent.popt); onmouseout=parent.popt=setTimeout('parent.oPopup.hide()',10);>");//用document.write()写菜单内容
        oPopup.document.write("<table width=100%  height=100% style='border-collapse : collapse;'>");
    for(var i=0;i<MenuText[t].length;i++)
        {
        oPopup.document.write("<tr><td background='image/topbg.gif' bgcolor=#cccccc style='border-top : #cccccc 1px solid;border-bottom : #666666 1px solid;border-left : #cccccc 1px solid;border-right : #666666 1px solid;mouse : hand; font-size : 12px; color:#000000;text-align : left;vertical-align : center;CURSOR: hand' onmouseover=this.bgColor='#C2D2E5'; onmouseout=this.bgColor='#cccccc'; height='20' onclick='parent.parent.main.location.href=\""+MenuEven[t][i]+"\"';>"+MenuText[t][i]+"</td></tr>");
        }
        oPopup.document.write("</table></td></tr></table>");
//alert("nnnnn")
        //oPopup.document.write("<table>");
//oPopup.document.write(b);
//oPopup.document.write("<tr><td>3333</td></tr>");
  //oPopup.document.write("</table>");
// alert("mmmm")
        oPopup.document.write("</body>")
}</script>
</HEAD><BODY>
<table>
<tr>
<td align="left" onclick="ButtonClick(this,1)">菜单1</td>
</tr>
<br>
<tr>
<td height="200">
</td>
</tr>
<br>
</table>
<table id="table1">
<tr>
<td align="left" >菜单3</td>
</tr>
<br>
<tr>
<td align="left" style="color:red" >菜单4</td>
<br></BODY>
</HTML>
DOM做这种动态伸展是比较方便的办法.