代码：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>获取文本域的光标位置</title> </head> <body> <textarea name="" id="textarea" cols="30" rows="10">这是一段文字，每次点击文字内容就会获取当前光标所在的位置</textarea> <script> var oText = document.getElementById('textarea'); document.onclick = function(e){ if(e.target.tagName=="TEXTAREA"){ alert(getCursortPosition(oText)); } } function getCursortPosition(obj) { var cursorIndex = 0; if (document.selection) { // IE Support obj.focus(); var range = document.selection.createRange(); range.moveStart('character', -obj.value.length); cursorIndex = range.text.length; } else if (obj.selectionStart || obj.selectionStart==0) { // another support cursorIndex = obj.selectionStart; } return cursorIndex; } </script> </body> </html>
效果：
