textureCache加载远程图片，在WebGL下失败

Cocos2d-x JavaScript
#1

// 环境
浏览器; chrome
自动使用的WebGL模式，

执行测试用例：TextureCacheTest.js

Uncaught SecurityError: Failed to execute ‘texImage2D’ on ‘WebGLRenderingContext’: The cross-origin image at http://www.cocos2d-x.org/attachments/download/1508 may not be loaded.
TexturesWebGL.js:467

强制使用canvas renderer显示正常，不过在console中会报跨域的警告
Image from origin ‘http://www.cocos2d-x.org’ has been blocked from loading by Cross-Origin Resource Sharing policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://127.0.0.1:8081’ is therefore not allowed access.

在本地环境中搭建http服务器，写了个测试文件，不会报跨域警告，代码如下

#2

求教怎么换成canvas renderer渲染

#3 
"renderMode"    : 0,
// "renderMode" sets the renderer type, only useful on web :
//      0 - Automatically chosen by engine
//      1 - Forced to use canvas renderer
//      2 - Forced to use WebGL renderer, but this will be ignored on mobile browsers

修改project.json就可以了