addEventListener中this指向

var obj = function() {...}// 将某事件绑定至某对象e，但事件函数中上下文保持为objobj.prototype.bindEvn = function(e){     e.addEventListener(Event,obj.method.bind(this),false)    }obj.prototype.method = function(){...}

转自https://segmentfault.com/a/1190000003952832