求解答?。。。。。。。。。。。。。。。。?！

和你一樣的問題，我的代碼是

var can1,can2;

var ctx1,ctx2;

var lastTime,deltaTime;

var bgPic = new Image();

var canWidth;

var canHeight;

document.body.onload = game;

function game () {

init();

lastTime = Date.now();

deltaTime = 0;

gameloop();

}

function init () {

can1= document.getElementById('canvas1');

ctx1 = can1.getContext('2d');

can2= document.getElementById('canvas2');

ctx2 = can2.getContext('2d');

bgPic.src = "./src/background.jpg";

canWidth = can1.width;

canHeight = can1.height;

}

function gameloop () {

window.requestAnimFrame(gameloop);

var now = Date.now();

deltaTime = now-lastTime;

lastTime = now;

drawBackground();

}

background.js的代碼是：

function drawBackground () {

ctx2.drawImage(bgPic,0,0,canWidth,canHeight);

}

你的這里：

canWidth=canvas1.width;

canHeight=canvas1.height;

改成：

canWidth=can1.width;

canHeight=can1.height;

試下