javascript this关键字
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <script type="text/javascript"> //this是表示当前监听事件这个对象,event.srcElement是引发事件的对象 function btnClick() {//相应事件函数中不能用this来获取事件对象 alert(this.value); } function btnClick2(btn) {//将this作为参数传过来 alert(btn.value); } </script> </head> <body> <input type="button" value="click1" onclick="alert(event.srcElement.value)" /> <input type="button" value="click2" onclick="alert(this.value)" /> <input type="button" value="click3" onclick="btnClick()" /> <input type="button" value="click4" onclick="btnClick2(this)" /> </body> </html>