如何在REST API中使用fetch？

Question

如何在REST API中使用AJAX的fetch方法？ 任何一个例子。

我尝试使用

＆＃13;

＆＃13;

fetch('https://jsonplaceholder.typicode.com/posts').then( (r) => console.log( r ));

＆＃13;

＆＃13;

＆＃13;

并没有按预期获得JSON。

Answer 1

您应该在JSON中转换promise结果。尝试使用

class CommonTests: XCTestCase {
    var validate: XCTestExpectation? = nil

    func testMytest() {        
      validate(completion: {
        loadSomeStuff(completion: { (list: [Stuff]?) in
          // actual test
        }
      })
    }

    func validate(completion: @escaping ()->()) {
        self.validateExpectation = self.expectation(description: "Setup")
        // async operation can be fired here
        // or if already started from somewhere else just wait for it to complete


        self.waitForExpectations(timeout: 60) { (error: Error?) in
            XCTAssert((error == nil), error?.localizedDescription ?? "Failed with unknown error")
            completion()
        }
    }

    func validateAsyncCompleted() {
      self.validateExpectation?.fulfill()
    }

    func loadStuff(completion: @escaping ([Stuff]?)->()) {

      // possible place for assertion or some other checks

      let expectation = self.expectation(description: "loading")
      DispatchQueue.global().async {

        let result: [Stuff]? = nil
        // load operation

        expectation.fulfill()
        completion(result)
      }

      self.waitForExpectations(timeout: 90) {  (error: Error?) in
        XCTAssert((error == nil), error?.localizedDescription ?? "load - failed with unknown error")
      }
    }
}