JS方式将光标聚焦在文本最后

<script type="text/javascript">
//将光标聚焦在文本最后
function cursorEnd(){
    var e = event.srcElement;
    var r = e.createTextRange();
    r.moveStart('character',e.value.length);
    r.collapse(true);
    r.select();
}
</script>
<input type=text name="test" value="test" onfocus="cursorEnd()">