Javascript運行時錯誤：應用程序undefined

我正在嘗試爲Windows 8應用程序使用Canvas和Javascript製作一個基本的應用程序。在編譯在Visual Studio 2012的代碼爲Windows 8應用程序我得到以下信息Javascript運行時錯誤：應用程序undefined

0x800a1391 - JavaScript runtime error: 'app' is undefined

我做了錯誤的，什麼樣的代碼做我用它來解決這個問題？

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="utf-8" /> 
    <title>Untitled</title> 

    <!-- WinJS references --> 
    <link href="//Microsoft.WinJS.1.0/css/ui-dark.css" rel="stylesheet" /> 
    <script src="//Microsoft.WinJS.1.0/js/base.js"></script> 
    <script src="//Microsoft.WinJS.1.0/js/ui.js"></script> 

    <!-- references --> 
    <link href="/css/default.css" rel="stylesheet" /> 
    <script src="/js/default.js"></script> 
    <!-- CreateJS --> 
    <script src="js/createJS/easeljs-0.5.0.min.js" type="text/javascript"></script> 
    <script src="js/createJS/preloadjs-0.2.0.min.js" type="text/javascript"></script> 
</head> 
<body> 
    <canvas id="gameCanvas"></canvas> 
</body> 
</html>

var canvas, content, stage; 
var bgimage, b1Image, p2Image, ammoImage, p1Lives, p2Lives, title, endGameImage; 
var bgbitmap, p1bitmap, p2bitmap, ammoBitmap; 
var preload; 

// Scale Factor 
var SCALE_X = window.innerWidth/800; 
var SCALE_Y = window.innerHeight/480; 
var MARGIN = 25; 
var GROUND_Y = 390 * SCALE_Y; 


function initialize() { 
    canvas = document.getElementById("gameCanvas"); 
    canvas.width = window.innWidth 
    canvas.height = window.innerHeight; 
    context = canvas.getContext("2d"); 

    function prepareGame() { 
     bgimage = preload.getResult("screenImage").result; 
     bgbitmap = new Bitmap(bgimage); 
     bgbitmap.scaleX = SCALE_X 
     bgbitmap.scaleY = SCALE_Y 
     stage.addChild(bgBitmap); 

     stage.update(); 
    } 

    //PreloadJS 
    preload = new PreloadJS(); 
    preload.onComplete = prepareGame; 
    var manifest = [ 
    { id: "screenImage", src: "images/Backgrounds/gameplay_screen.png" }, 
    { id: "redImage", src: "images/Catapults/Red/redIdle/redIdle.png" }, 
{ id: "blueImage", src: "images/Catapluts/Blue/blueIdle/blueIdle.png" }, 
{ id: "ammoImage", src: "images/Ammo/rock_ammo.png" }, 
{ id: "winImage", src: "images/Backgrounds/victory.png" }, 
{ id: "loseImage", src: "images/Backgrounds/defeat.png" }, 
{ id: "blueFire", src: "images/Catapults/Blue/blueFire/blueCatapult_fire.png" }, 
{ id: "redFire", src: "images/catapults/Red/redFire/redCatapult_fire.png" } 
]; 
preload.loadManifest(manifest); 

stage = new Stage(canvas); 
} 

function gameLoop() { 
    update(); 
    draw(); 
} 

function update() { 

} 

function draw() { 

} 

app.oncheckpoint = function (args) { 
    document.addEventListener("DOMContentLoaded", initialize, false); 
    app.start(); 
};

同樣在我使用CreateJS如果這意味着什麼

來源

2012-10-30 Shaquille Ray

app一個側面說明不是全球化，所以會確實是不確定的上面顯示的上下文。這是一個模塊（匿名函數）中定義的default.js：

(function() { 
    "use strict"; 

    WinJS.Binding.optimizeBindingReferences = true; 

    var app = WinJS.Application;

也就是說，什麼是你想在此位的代碼呢？ oncheckpoint將包括在暫停應用程序時保持狀態的代碼;添加一個事件監聽器並調用start在這種情況下並不合理。

來源

2012-10-30 19:20:29

Javascript運行時錯誤：應用程序undefined

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