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https://github.com/camsong/blog/issues/9

0.1+0.2   //0.30000000000000004
1-0.9     //0.09999999999999998
9007199254740993-9007199254740992  //0
Math.pow(2,1023) //8.98846567431158e+307   
//µ«ÊÇ
Math.pow(2,1024)  //Infinity

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תÔØÓÚ:https://www.cnblogs.com/alexandra/p/10273345.html