解决高亮度显示内容问题（onFocus)

解决高亮度显示内容问题（onFocus)
<script language="JScript">
function MyFocus(obj)
{
obj.value += '';
var rng = obj.createTextRange();
    rng.moveStart("character", obj.value.length);    
    rng.collapse(true);        
    rng.select(); 
}
</script>
<input>
<input name=test value="abcdfdf" onfocus="MyFocus(this)">