更多示例
var someObj = {
/**
* @param {string} param1 - Docs on property assignments work
*/
x: function(param1){}
};
/**
* As do docs on variable assignments
* @return {Window}
*/
let someFunc = function(){};
/**
* And class methods
* @param {string} greeting The greeting to use
*/
Foo.prototype.sayHi = (greeting) => console.log("Hi!");
/**
* And arrow functions expressions
* @param {number} x - A multiplier
*/
let myArrow = x => x * x;
/**
* Which means it works for stateless function components in JSX too
* @param {{a: string, b: number}} test - Some param
*/
var sfc = (test) => <div>{test.a.charAt(0)}</div>;
/**
* A parameter can be a class constructor, using Closure syntax.
*
* @param {{new(...args: any[]): object}} C - The class to register
*/
function registerClass(C) {}
/**
* @param {...string} p1 - A 'rest' arg (array) of strings. (treated as 'any')
*/
function fn10(p1){}
/**
* @param {...string} p1 - A 'rest' arg (array) of strings. (treated as 'any')
*/
function fn9(p1) {
return p1.join();
}
已知不支持的模式
在值空间中将对象视为类型是不可以的,除非对象创建了类型,如构造函数。
function aNormalFunction() {
}
/**
* @type {aNormalFunction}
*/
var wrong;
/**
* Use 'typeof' instead:
* @type {typeof aNormalFunction}
*/
var right;
对象字面量属性上的=后缀不能指定这个属性是可选的:
/**
* @type {{ a: string, b: number= }}
*/
var wrong;
/**
* Use postfix question on the property name instead:
* @type {{ a: string, b?: number }}
*/
var right;
Nullable类型只在启用了strictNullChecks检查时才启作用:
/**
* @type {?number}
* With strictNullChecks: true -- number | null
* With strictNullChecks: off -- number
*/
var nullable;
Non-nullable类型没有意义,以其原类型对待:
/**
* @type {!number}
* Just has type number
*/
var normal;
不同于JSDoc类型系统,TypeScript只允许将类型标记为包不包含null。 没有明确的Non-nullable -- 如果启用了strictNullChecks,那么number是非null的。 如果没有启用,那么number是可以为null的。
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