贤鱼：pass all tests #9
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感觉这题的关键在于对于相同的事件，不论注册多少个代理事件，Dom树中只监听了一个函数。所以这里加了个
delegatorEventList，如果有对应的事件类型，就往数组中增加一个需要被代理的目标元素和对应事件，如果没有就增加一个事件监听