修复个小问题：IE11点击保存为图片，鼠标移到图片上提示“点击保存”，但是没有反应
修复个小问题：IE11点击保存为图片，鼠标移到图片上提示“点击保存”，但是没有反应

1. IE11不支持<a> download 属性；
2. IE11不能通过window.attachEvent判断了。

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