A special data type ts

Four. Ts data types

1. tuple (a tuple type): Specifies the type of data can be stored to the array location specified

　　　　例：let arr:[number, string] = [123, ‘123’];

1. enum (enumeration): the digital conversion of the identifier

　　　　Example: enum {enum name identifier Shaping = constant, ...};

　　　　Call: the name of the enumeration identifiers (Note: identifiers can be written directly write or string)

1. any (any type): You can easily type assignment
2. Anonymous function: var fun = function run (): string {

　　　　　　　　　　return  ‘run’;

　　　　　　　　}

1. The default value of the function:

　　Function test (name ?: string) {...}: the name of the parameter with? This parameter can be passed on behalf of not pass, this parameter should be placed last

　　Function test (name: string = null) {...}: This parameter has a default value is null if passed

1. Conversion Type

　　this as any: shows a type of this is converted into any