1、JvmStatic 应用于对象或伴生对象的属性，使其 getter 和 setter 方法成为该对象或包含伴生对象的类的静态成员，应用于对象或伴生对象的方法，使其生成象或包含伴生对象的类改静态方法。
Specifies that an additional static method needs to be generated from this element; if it's a function.If this element is a property, additional static getter/setter methods should be generated.
2、JvmOverloads 生成不含有默认值参数Java重载方法和所有的参数的重载方法；
Instructs the Kotlin compiler to generate overloads for this function that substitute default parameter values.
If a method has N parameters and M of which have default values, M overloads are generated: the first one takes N-1 parameters (all but the last one that takes a default value), the second takes N-2 parameters, and so on.
3、JvmName 改变getter和setter中的方法名
Specifies the name for the Java class or method which is generated from this element.
4、JvmField 告诉Kotlin编译器不使用“getter/setters”,直接暴露类中的属性
Instructs the Kotlin compiler not to generate getters/setters for this property and expose it as a field.
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