JavaScript window.getSelection usage example

<script type="text/javascript" language="javascript">
if (window.getSelection) {
    // Mozilla
    if (String(window.getSelection()))
      return String(window.getSelection());
} else if (document.getSelection) {
    // Opera? Netscape 4?
    if (document.getSelection())
      return document.getSelection();
} else {
    // IE
    if ( document.selection.createRange().text )
      return document.selection.createRange().text;
}
</script>
//以下代码是只能用于IE
<input type="text" id="test" value="get the next character after current cursor? 可取中文字" size="60"><br/>
<input type="button" value="取当前光标的后一个字母" onclick="nextChar()"><br/>
<input type="text" value="取当前光标的位置" onclick="charPosition()"><br/>

<script type="text/javascript" language="javascript">
<!--
  var s;  
  function nextChar()  
  {  
      document.getElementById('test').focus();
      var sel = document.selection.createRange();  
      sel.moveStart("character",0);  
      sel.moveEnd("character",1);  
      s = sel.text.slice(-1);  
      alert("S = " + s);  
  }
  
  function charPosition() {
     var obj = window.event.srcElement;
     var s=document.selection.createRange();
     s.setEndPoint("StartToStart", obj.createTextRange())
     var pos = s.text.length;
     alert(pos);
     obj.createTextRange().select();
     alert(document.selection.createRange().text);
  }
//-->
</script>