JS获取textArea中光标位置的方法

function getCursorPos(pTextArea) {
var cursurPosition=-1;
if(pTextArea.selectionStart){//非IE浏览器
cursurPosition= pTextArea.selectionStart;
}else{//IE
var range = document.selection.createRange();
range.moveStart("character",-pTextArea.value.length);
cursurPosition=range.text.length;
}
return cursurPosition;
}