Bind events can not be removed. #151
Description
bind events firstly and cannot unbind event in later update.
in function bindEvents, we have to call instance.off() firstly to remove all events firstly, and then iterate to add events
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bind events firstly and cannot unbind event in later update.
in function bindEvents, we have to call instance.off() firstly to remove all events firstly, and then iterate to add events