Response.ok

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2017年3月⁩.

实验性: 这是一项实验性技术
在将其用于生产之前，请仔细检查浏览器兼容性表格。

Response 接口的只读属性 ok 包含一个布尔值，表明响应是否成功（状态码在 200-299 范围内）.

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 ok value to the console.

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

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

fetch(myRequest).then(function (response) {
  console.log(response.ok); // returns true if the response returned successfully
  response.blob().then(function (myBlob) {
    var objectURL = URL.createObjectURL(myBlob);
    myImage.src = objectURL;
  });
});