运行没什么问题，就是学习碰撞系统的时候firebug报的error
Error: WebGL: texImage2D: Incurred CPU-side conversion, which is very slow. cocos2d-js-for-preview.js:39383:25
Error: WebGL: texImage2D: Incurred CPU pixel conversion, which is very slow. cocos2d-js-for-preview.js:39383:25
Error: WebGL: texImage2D: Chosen format/type incurred an expensive reformat: 0x1908/0x1401 cocos2d-js-for-preview.js:39383:25
Error: WebGL: texImage2D: Incurred CPU-side conversion, which is very slow. cocos2d-js-for-preview.js:39383:25
Error: WebGL: texImage2D: Incurred CPU pixel conversion, which is very slow. cocos2d-js-for-preview.js:39383:25
Error: WebGL: texImage2D: Chosen format/type incurred an expensive reformat: 0x1908/0x1401