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Body mixin 的 json() 會拿 Response stream 並完整地讀取他。它會回傳一個能夠實現 (resolve) 把回傳的結果的 body text 解析成 JSON 型別的 Promise。

語法

response.json().then(function(data) {
  // do something with your data
});

參數

None.

回傳

一個能夠實現 (resolve) 把回傳的結果的 body text 解析成 JSON 型別的 Promise。這可以是任何能夠被 JSON 呈現的資料型別 — 物件 (object), 陣列 (array), 字串 (string), 數字 (number)...

範例

在我們的範例 fetch json example (run fetch json live) 中, 我們用 constructor Request.Request 產生一個新的請求,並且用他去取回 .json 檔案。 當取回 (fetch) 成功時,我們使用 json() 去讀取跟解析資料,然後依照我們期待的把回傳的結果物件 (resulting objects) 裡讀取到的數值存入 list 中藉以顯示我們的產品資料。

var myList = document.querySelector('ul');

var myRequest = new Request('products.json');

fetch(myRequest)
  .then(function(response) { return response.json(); })
  .then(function(data) {
    for (var i = 0; i < data.products.length; i++) {
      var listItem = document.createElement('li');
      listItem.innerHTML = '<strong>' + data.products[i].Name + '</strong> can be found in ' +
                           data.products[i].Location +
                           '. Cost: <strong>£' + data.products[i].Price + '</strong>';
      myList.appendChild(listItem);
    }
  });

規範

Specification Status Comment
Fetch
The definition of 'json()' in that specification.
Living Standard  

瀏覽器相容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 42
Full support 42
Full support 41
Disabled
Disabled From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.
Edge Full support YesFirefox Full support 39
Full support 39
Full support 34
Disabled
Disabled From version 34: this feature is behind the dom.fetch.enabled preference. To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 29
Full support 29
Full support 28
Disabled
Disabled From version 28: this feature is behind the Experimental Web Platform Features preference.
Safari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile Full support YesFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.
User must explicitly enable this feature.

參見

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