Response.status

let myStatus = response.status;

一个数字（确切来讲是一个 unsigned short）

In our Fetch Response example (see Fetch Response live) we create a new Request object using the Request() constructor, passing it a JPG path. We then fetch this request using fetch(), extract a blob from the response using Body.blob, create an object URL out of it using URL.createObjectURL, and display this in an <img>.

Note that at the top of the fetch() block we log the response status value to the console.

var myImage = document.querySelector("img");

var myRequest = new Request("flowers.jpg");

fetch(myRequest).then(function (response) {
  console.log(response.status); // returns 200
  response.blob().then(function (myBlob) {
    var objectURL = URL.createObjectURL(myBlob);
    myImage.src = objectURL;
  });
});

• ServiceWorker API
• HTTP access control (CORS)
• HTTP