Solve the problem that the value of new date() of JS in IE and Firefox is invalid date and Nan Nan

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solve IE、firefox browsers JS Of new Date() The value of is Invalid Date、NaN-NaN The problem of

Reference article ：

（1） solve IE、firefox browsers JS Of new Date() The value of is Invalid Date、NaN-NaN The problem of

（2）https://www.cnblogs.com/hhzf/p/5833640.html

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