产生的虚拟乱数介于0到1之间(包括0但不包括1)。也就是说，传回的数字可以是零，但是一律小于一。
The pseudorandom number generated is from 0 (inclusive) to 1 (exclusive), that is, the returned number can be zero, but it will always be less than one.
产生的虚拟乱数介于0到1之间(包括0但不包括1)。也就是说，传回的数字可以是零，但是一律小于一。
The pseudorandom number generated is from 0 (inclusive) to 1 (exclusive), that is, the returned number can be zero, but it will always be less than one.
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