为啥cc.imeDispatcher是undefined的?

http://cn.cocos2d-x.org/article/index?type=cocos2d-x&url=/doc/cocos-docs-master/manual/framework/html5/v3/singleton-objs/zh.md
这个文档里面说:

重构列表

v3.0中部分被重构的单例类如下 :
// In engine core
cc.Configuration.getInstance() --> cc.configuration
cc.ShaderCache.getInstance() --> cc.shaderCache
cc.TextureCache.getInstance() --> cc.textureCache
cc.AnimationCache.getInstance() --> cc.animationCache
cc.SpriteFrameCache.getInstance() --> cc.spriteFrameCache
cc.Screen.getInstance() --> cc.screen
cc.TIFFReader.getInstance() --> cc.tiffReader
cc.IMEDispatcher.getInstance() --> cc.imeDispatcher

cc.IMEDispatcher.getInstance()被重构成cc.imeDispatcher
看文档应该是要有cc.imeDispatcher这东西的,可实际上却是undefined的

文档中的失误,其实imeDispatcher是没有被绑定的,有一个issue记录了这个,后续版本中我们会加上

https://github.com/cocos2d/cocos2d-js/issues/1232