var?can1;
var?can2;
var?ctx1;
var?ctx2;
var?canWidth;
var?canHeight;
var?lastTime;
var?deltaTime;
var?bgPic=new?Image();
document.body.onload=game;
function??game(){
????init();
????lastTime=Data.now();
????deltaTime=0;
????gameloop();
}
function?init(){
????can1=document.getElementById("canves1");//dishes,dust,UI,circle
????ctx1=can1.getContext('2d');
????can2=document.getElementById("canves2")//background,ane,fruits
????ctx2=can2.getContext('2d');
????bgPic.src="./src/background.jpg";
????canWidth=can1.Width;
????canHeight=can1.height;
}
function??geamloop(){
????window.requestAnimFrame(gameloop);
????var?now=Date.now();
????deltaTime=now-lastTime;
????lastTime=now;
????drawbackground();
}

2016-05-04
canvas敲錯(cuò)了吧,沒(méi)獲取到這個(gè)對(duì)象
2016-01-20
視頻上的寫(xiě)錯(cuò)了 但是不知道視頻上的背景怎么出來(lái)的,? 這個(gè)才是正確的寫(xiě)法? window.requestanimationframe