查找页面中的字符

请将下面的原代码插入到<body>下面:你可以输入'脚本'查查看<BR>
<script language="JavaScript">

var NS4 = (document.layers);  // Which browser?
var IE4 = (document.all);

var win = window;  // window to search.
var n = 0;

function findInPage(str) {

var txt, i, found;

if (str == "")
  return false;

// Find next occurance of the given string on the page, wrap around to the
// start of the page if necessary.

if (NS4) {

  // Look for match starting at the current point. If not found, rewind
  // back to the first match.

  if (!win.find(str))
   while(win.find(str, false, true))
    n++;
  else
   n++;

  // If not found in either direction, give message.

  if (n == 0)
   alert("Not found.");
}

if (IE4) {
  txt = win.document.body.createTextRange();

  // Find the nth match from the top of the page.

  for (i = 0; i <= n && (found = txt.findText(str)) != false; i++) {
   txt.moveStart("character", 1);
   txt.moveEnd("textedit");
  }

  // If found, mark it and scroll it into view.

  if (found) {
   txt.moveStart("character", -1);
   txt.findText(str);
   txt.select();
   txt.scrollIntoView();
   n++;
  }

  // Otherwise, start over at the top of the page and find first match.

  else {
   if (n > 0) {
    n = 0;
    findInPage(str);
   }

   // Not found anywhere, give message.

   else
    alert("Not found.");
  }
}

return false;
}

</script>
<form name="search" onSubmit="return findInPage(this.string.value);">
<font size=3><input name="string" type="text" size=15 onChange="n = 0;"></font>
<input type="submit" value="Find">
</form>