function cc()
{
var e = event.srcElement;
var r =e.createTextRange();
r.moveStart('character',e.value.length);
r.collapse(true);
r.select();
}
<input type=text name=text1 value="sharejs.com" οnfοcus="cc()">
轉自:http://www.sharejs.com/showdetails-178.aspx