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| { | |
| off(eventname,callback){ | |
| if(!this.hasOwnProperty(eventname))return false; | |
| if(!(callback && callback.constructor===Function))return false; | |
| if(Array.isArray(this[eventname])){ | |
| this[eventname]=this[eventname].filter(eventcb=>eventcb!==callback); | |
| } | |
| } | |
| } |
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