向messageCenterOutSide发事件改为同步事件。这样顺带解决了IE8-中浏览器event对象中的属性不能被用户取得的问题（#1528），以及不能用先un再on方式避免事件死循环（#1321）的问题。
向messageCenterOutSide发事件改为同步事件。这样顺带解决了IE8-中浏览器event对象中的属性不能被用户取得的问题（#1528），以及不能用先un再on方式避免事件死循环（#1321）的问题。

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