COCOS2D 学习笔记

cc.Node.scheduleUpdate:function ()

     * schedules the "update" method.                                                                         

     * It will use the order number 0. This method will be called every frame.                             

     * Scheduled methods with a lower order value will be called before the ones that have a higher order value

不断地执行 Update方法

与之对应的是

scheduleUpdateWithPriority:function (priority)

schedules the "update" callback function with a custom priority.

unscheduleUpdate:function ()

unschedules the "update" method.

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向量的运用

// Determine the length of how far you're shooting
var offset = cc.pSub(realDest, projectile.getPosition()); //求出offset，这是一个向量差值，比如realDest=（1,1），projectilePos=（3,4），求出结果应该是一个（2,3）的向量
var length = cc.pLength(offset);//Calculates distance between point an origin ， 简单2维理解就是求出距离
var velocity = 480.0; //如在这里设置一个速度变量
var realMoveDuration = length / velocity;//简单的计算一个速度

今天，一个 错误，浪费了几个小时的时间。

在cocos2D.js里面。一定要注意令到main.js在最后加载，否则在其后面的文件都无法访问， prompt referenceError

入下例，如果loading.js放在最后，则加载loading场景的时候，会出错。因为loading文件下定义的类都无法访问

tag:'gameCanvas',

// 2
engineDir:'./Platform/HTML5/cocos2d/',
//Please make sure main.js is the last loading item otherwise the js behind that will not take effective
appFiles:[
'./Src/Loading.js',
'./Src/resource.js',
'./Src/MainLayer.js',
'./Src/config/GameConfig.js',
'./main.js',
//            './Src/Loading.js'
]

开启精灵的debug mode ， 在main.js的 applicationDidFinishLaunching添加如下代码

//Here to enable the sprite debug draw mode
//0: not enable sprite debug draw
//1: draw bounding box
//2: draw texture box
cc.SPRITE_DEBUG_DRAW = 1;


//Here to enable the sprite debug draw mode //0: not enable sprite debug draw //1: draw bounding box //2: draw texture box cc.SPRITE_DEBUG_DRAW =
1; //load resources// cc.LoaderScene.preload(g_resources, function () {// RL00001 the default loading are there