拍拍尘土

function getSelectedText(){
                var selectedText;
                var textField=document.getElementById('inputTextarea');
                if(window.getSelection) selectedText=getTextFieldSelection(textField);//getTextFieldSelection(document.getElementById("inputTextArea"));
                else selectedText=document.selection.createRange().text;
                     alert(selectedText);
         }

         function getTextFieldSelection(e){

function getCursortPosition (ctrl) {
  var CaretPos = 0;  // IE Support
  if (document.selection) {
  ctrl.focus ();
    var Sel = document.selection.createRange ();
    Sel.moveStart ('character', -ctrl.value.length);
    CaretPos = Sel.text.length;
  }
  // Firefox support
  else if (ctrl.selectionStart || ctrl.selectionStart == '0')
    CaretPos = ctrl.selectionStart;
  return (CaretPos);
}

function setCaretPosition(ctrl, pos){