实际上，float/double不如十进制精确.对于货币数据，建议使用十进制类型，因此您应该使用:

Actually float/double is not as precise as decimal. For monetary data, the decimal type is recommended, so you should probably use:

$table->decimal(10, 2); // instead of float

阅读此有关详细信息，以及来自MySql的浮动手册.

Read this for some detailed information and float manual from MySql.