Block是OC中的闭包，他和swift中的闭包有什么区别呢？
走同样的路，发现不同的人生
The so-called closures all control the scope of variables, so there is no need to understand the differences in depth! Never change without departing from its origin
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The so-called closures all control the scope of variables, so there is no need to understand the differences in depth! Never change without departing from its origin