B/S——C/S样式

document.onkeydown = hotkey;
function hotkey() {
 var a = window.event.keyCode;
 alert(a) ;
 if ((a == 81) && (event.altKey)) {// alt+q
        alt_q() ;
  }
 if ((a == 77) && (event.ctrlKey))// alt+m
 {
        ctrl_m() ;
 }
 }