document.onirkeypress = grabevent;
document.onkeypress = grabevent;
document.onsystemevent = grabevent;

function grabevent()
{
var retv = 1;
var eventvalue = event.which;
var p2 = event.modifiers;
var type = event.type;
Log.debug("wh , stb.html------eventvalue = " + eventvalue);
switch (eventvalue)
{
case 10006:
                       a;
                       break;
                  case 10007:
                        b;
                         break;
                 default:
                       break;
          }
我第一次给浏览器发10006,a会执行成功,但是第二次发信号,浏览器为什么没有接受呢