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火狐调试移动端页面，找不到 event.changedTouches[0]

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火狐调试移动端页面，找不到 event.changedTouches[0]

使用epub.js做阅读器，绑定页面触摸事件

如题所示，在chrome浏览器是没问题的，但在火狐中报错了，提示：TypeError: event.changedTouches[0] is undefined

试着打印这个事件对象，也是没问题的

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