javascript 事件

按键事件
回车键被按下
 document.onkeydown = function(event_e){          if(window.event) {              event_e = window.event;          }          var int_keycode = event_e.charCode||event_e.keyCode;          if( int_keycode == '13' ) {              //your handler function,please.              onLogin();              return false;          }      }