–相同
const和readonly的值一旦初始化则都不再可以改写.
–不同
const只能在声明时初始化；readonly既可以在声明时初始化也可以在构造器中初始化；
const隐含static，不可以再写static const；readonly则不默认static，如需要可以写static readonly；
const是编译期静态解析的常量（因此其表达式必须在编译时就可以求值）；readonly则是运行期动态解析的常量；
const既可用来修饰类中的成员，也可修饰函数体内的局部变量；readonly只可以用于修饰类中的成员
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