之前用这还可以，这几天一直 undefined ，正在做横竖屏的，捉急啊...
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呼如林
TA贡献1798条经验 获得超3个赞
Deprecated
This feature has been removed from the Web standards.Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.
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