问一下关于屏幕阅读的问题

/**
*
*请问做这个程序有多大的技术难度？大概需要多少行代码？
*
**/
1：楼主说的是中间横条工具条吧，如果是的话，我试着做了些操作看样子有去与服务器操作，且页面没有刷新可能用了框架，很有可能用了“阿甲”；
“技术难度”：主要用到的是javascript,还有就上述两种技术
“大概需要多少行代码”，这个可能得看你具体需求。2：基本功能是要求用户鼠标指到哪里就读哪里
这主要是对这个结点进行了定位，楼主可以参照position,z-index,top等相关属性；

解决方案 »

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现在主要的技术问题是怎样获取鼠标所指处的文本内容，有如下一段代码，这里的javascript能够读取包括在<p><h3>等标签中的内容，但是对于“some plain text!”这样的直接放在<body>里面的文本却无能为力。
由谁能够提供一段代码吗？
<html>
<head>
<script type="text/javascript">
document.onmousemove = function()
{
whichElement(event);
}
function whichElement(e)
{
var targ;
if (!e) var e = window.event;
if (e.target) targ = e.target;
else if (e.srcElement) targ = e.srcElement;
window.status = targ.innerText;
}
</script>
</head><body>
some plain text!<p>Click somewhere in the document. An alert box will alert the tag name of the element you clicked on.</p><h3>This is a header</h3>
<p>This is a paragraph</p>
<img border="0" src="ball16.gif" width="29" height="28" alt="Ball">some other plain text!
</body></html>
TextRange
TextRectangle
getClientRects
getBoundingClientRect
看这些相关函数
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>TextRectangle Object demo</TITLE>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=iso-8859-1">
<META NAME="AUTHOR" CONTENT="InetSDK">
<META NAME="MS.LOCALE" CONTENT="EN-US">
<META NAME="ROBOTS" CONTENT="noindex"><LINK REL="stylesheet" HREF="/workshop/samples/author/dhtml/refs/samplesSDKIE4.css" TYPE="text/css"><SCRIPT>
document.parentWindow.status = "";
var timid = -1;
var timoID_2 = -1;
var nLine;
var nPosInLine;
var oRcts;
var nDivLen;
var nEraser;function LoadDone() {
    oTextRange = document.body.createTextRange();
    oRcts = oTextRange.getClientRects();   // Get bounding rect of the range
    nLine = 0;
    oBndRct = obj.getBoundingClientRect();
    nDivLen = oBndRct.right - oBndRct.left + 1;
    MoveTo();
}function MoveTo() {
  if(nLine >= oRcts.length) {
     nLine = 0;
  }
  obj.style.top = oRcts[nLine].top;
  nPosInLine = oRcts[nLine].left;
  nEraser = 0;
  timoID_2 = setInterval("MoveToInLine()",60);
}function MoveToInLine() {
  if(nPosInLine >= oRcts[nLine].right - nDivLen) {
     clearInterval(timoID_2);
     timoID_2 = -1;
     obj.style.left = oRcts[nLine].right - nDivLen;
     nLine++;
     timid = setTimeout("MoveTo()", 100);
     return;
  }
   if(nEraser == 0) {
      nEraser = 1; im.src = "/workshop/graphics/dot.gif";
   } else {
      nEraser = 0; im.src = "/workshop/graphics/dot.gif";
  }
  obj.style.left = nPosInLine;
  nPosInLine += 3;
}function End() {
   if(timid != -1)
    clearInterval(timid);
   timid = -1;
   if(timoID_2 != -1)
    clearInterval(timoID_2);
   timoID_2 = -1;
}
</SCRIPT>
</HEAD>


<BODY ID="bodyid" onload="LoadDone()" onresize="End();LoadDone()" onunload="End()" TOPMARGIN=0 LEFTMARGIN=0 BGPROPERTIES="FIXED" BGCOLOR="#FFFFFF"
LINK="#000000" VLINK="#808080" ALINK="#000000">
fdsfdsfds
<BLOCKQUOTE CLASS="body">
fdsfdsfdsfdsfd
<P STYLE="text-align:center">
<B> The quick brown fox</B>
<BR>
<P ALIGN="center">The <BR> quick brown fox <BR>
<UL>
    <LI>The quick brown fox
</UL>
<UL>
            <LI>The quick </LI>
            <LI>The quick brown fox </LI>
            <LI>The quick brown fox jumps over </LI>
            <LI>The quick brown fox jumps over the lazy dog. </LI>
        </UL><P><BLOCKQUOTE>
Notice that as you resize the window, the coordinates are not adjusted, since the coordinates are set at <B>onload</B>.</BLOCKQUOTE><CENTER>
<BR><BR><BR>
<HR>
Right-click anywhere in the window to view the source code.
</CENTER>
<DIV ID="obj" STYLE="position:absolute"><IMG ID="im" SRC="/workshop/graphics/dot.gif" WIDTH="16" HEIGHT="16" border="0" alt="*">  </DIV>
</P>
<BR><BR><BR>
© <A CLASS="clsIncCpyRt" HREF="http://www.microsoft.com/isapi/gomscom.asp?TARGET=/info/cpyright.htm" TARGET="_top"> 2002 Microsoft Corporation. All rights reserved. Terms of use</A>.

</BLOCKQUOTE>
</BODY>
</HTML>