相关疑难解决方法(0)

我想用HTML5 <canvas>元素编写一个蛇游戏演示.我试图注册键盘(onkeydown)事件,但它不起作用.

码:

   canvas.onkeydown = divertDirection; //don't work
   //canvas.addEventListener("keydown", divertDirection, false);  //don't work

   //?????????????
   function divertDirection(ev) {
        console.log(ev);
    }

    //register this event for widnow
   window.addEventListener("keydown", divertDirection, false); //ok