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double 字段中有些数字小数点后有很多9，但是在计算的时候没有导致小数点后很多位的因素

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Release： 2016-06-23 13:27:21
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double 字段中有些数字小数点后有很多9，但是在计算的时候没有导致小数点后很多位的因素

比如有些数值是 ：7.66999999999999

但是计算的过程中都是 0.3+0.5 这类，不会得到小数点后这么长的


回复讨论(解决方案)

floor()函数：返回不大于 value 的最接近的整数，舍去小数部分取整。
round() 函数： 对浮点数进行四舍五入 

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double 字段中有些数字小数点后有很多9，但是在计算的时候没有导致小数点后很多位的因素
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