Swift提供了两种打印方式
public func print(_ items: Any..., separator: String = default, terminator: String = default)
public func debugPrint(_ items: Any..., separator: String = default, terminator: String = default)
将需要打印的参数用(parameter)包裹即可
var name="jack"
print("name is \(name)")
debugPrint("name is \(name)")
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