try:
<script language="javascript">
function getPos(obj){
obj.focus();
var s=document.selection.createRange();
s.setEndPoint("StartToStart",obj.createTextRange())
alert('left:'+(s.text.length)+'\nright:'+(obj.value.length-s.text.length));
}
</script>
<input type=text name=text1 value="1234567890">
<input type=button value=getPos onclick=getPos(text1)>
<script language="javascript">
function getPos(obj){
obj.focus();
var s=document.selection.createRange();
s.setEndPoint("StartToStart",obj.createTextRange())
alert('left:'+(s.text.length)+'\nright:'+(obj.value.length-s.text.length));
}
</script>
<input type=text name=text1 value="1234567890">
<input type=button value=getPos onclick=getPos(text1)>
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货