The API you call usingfetch()may be down or other errors may occur. If this happens, therejectpromise will be returned. Thecatchmethod is used to handlereject. The code withincatch()will be executed if an error
letapiResponse=fetch("https://fjolt.com/api");console.log(apiResponse);// Returns Promise<Pending> 1. 2. 3. 在fetch() 函数运行时,JavaScript并不会等待响应。如果我们想要访问响应,我们必须明确告诉 JavaScript 需要等待。 等待fetch() 有两种方法: 可以在 then 循环中使用 then 并操作 fetch() 的响...
Luckily, there's an easier way. With the Fetch API in JavaScript, you can tell your computer to get whatever website or file you need and bring it back to you. In this article, we'll show you how to use the Fetch API in several ways. We'll also give some examples of when it m...
fetch(uri) .then(response=>response.json()) .then(data=>_displayItems(data)) .catch(error=>console.error('Unable to get items.', error)); 当Web API 返回成功状态的代码时,将调用_displayItems函数。 将_displayItems接受的数组参数中的每个待办事项添加到具有“编辑”和“删除”按钮的表中。 如果...
let res = await fetch(url); if (res.ok) { let text = await res.text(); return text; } else { return `HTTP error: ${res.status}`; } } doRequest().then(data => { console.log(data); }); We use theURLSearchParamsto transform the JSON object into suitable URL query form....
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In this example, we use the Fetch API to retrieve the data and then investigate the response to check for errors and then either process the error or parse the JSON. Note that the promise ‘then’ clause is used even in the case of a unsuccessful HTTP response code. That is why there...
开篇自从Fetch API 问世以来,我们就能使用漂亮的语法发送HTTP Request 或取后台接口数据,这篇文章将会分享我自己常用的Fetch方法( GET、POST、搭配await 或promise.all...,通过天气数据开放平台可以取得许多气象资料(例如阿里云的API开放平台),下面的示例获取北京的
Since Fetch is based on async and await, the example above might be easier to understand like this: Example asyncfunctiongetText(file) { letx =awaitfetch(file); lety =awaitx.text(); myDisplay(y); } Try it Yourself » Or even better: Use understandable names instead of x and y: ...
The title of the layer used to identify it in places such as the Legend and LayerList widgets. MapImageLayer type String For MapImageLayer the type is always "map-image". MapImageLayer url String|null|undefined The URL to the REST endpoint of the map service. MapImageLayer useViewTime...