js查找頁面關鍵字

<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 (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++;

    }

    else {

      if (n > 0) {

        n = 0;

        findInPage(str);

      }

      else

        alert("Not found1.");

    }

  }

  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">
    <br />
    asdfasdf<br />
    <br />
    asdfsadf<br />

</form>