如题，我知道flag是组合的就可以，但是确实不清楚，设置为0时候，会返回什么样的信息
光阴似箭催人老，日月如移越少年。
The flag parameter of this method does not make much sense, 0 and other flags return the same. It's easy to verify it yourself.
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The flag parameter of this method does not make much sense, 0 and other flags return the same. It's easy to verify it yourself.