js 获取输入框中光标的索引位置

<html>
<head></head>

<body>
<script>
function getTxt1CursorPosition(){
    var oTxt1 = document.getElementById("txt1");
    var cursurPosition=-1;
    if(oTxt1.selectionStart){//非IE浏览器
        cursurPosition= oTxt1.selectionStart;
    }else{//IE
        var range = document.selection.createRange();
        range.moveStart("character",-oTxt1.value.length);
        cursurPosition=range.text.length;
    }
    alert(cursurPosition);
}
</script>
<input type="text" >


</body>


</html>

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