js获取光标位置和设置文本框光标位置示例代码

        function setTxt1CursorPosition(i){
            var oTxt1 = document.getElementById("txt2");
            var cursurPosition=-1;
            if(oTxt1.selectionStart){//非IE浏览器
                oTxt1.selectionStart=i;
            }else{//IE
                var range = oTxt1.createTextRange();
                range.move("character",i);
                range.select();
            }
        }

        function getTa1CursorPosition(){
            var evt =window.event?window.event:getTa1CursorPosition.caller.arguments[0];
            var oTa1 = document.getElementById("ta1");
            var cursurPosition=-1;
            if(oTa1.selectionStart){//非IE浏览器
                cursurPosition= oTa1.selectionStart;
            }else{//IE
                var range = oTa1.createTextRange();
                range.moveToPoint(evt.x,evt.y);
                range.moveStart("character",-oTa1.value.length);
                cursurPosition=range.text.length;
            }
            alert(cursurPosition);
        }

        function setTa1CursorPosition(i){
            var oTa2 = document.getElementById("ta2");
            if(oTa2.selectionStart){//非IE浏览器
                oTa2.selectionStart=i;
                oTa2.selectionEnd=i;
            }else{//IE
                var range = oTa2.createTextRange();
                range.move("character",i);
                range.select();
            }
        }
    </script>