如何获取光标在文本框中的位置

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