fetch
必然要替换XMLHttpRequest
,所以是时候尝试 fetch 了;- 本封装仅针对npm引入;
- 本封装依赖 es6-promise 和 whatwg-fetch,分别对
promise
和fetch
进行兼容性处理;- 还有一种兼容性处理是依赖 es6-promise 和isomorphic-fetch ,但是看它的源码就会发现,
isomorphic-fetch
只不过是引用了whatwg-fetch
,并没有做二次开发,
isomorphic-fetch
只是将fetch添加为全局,以便其API在客户端和服务器之间保持一致,所以没必要。
封装的主要内容
-
fetch
的请求方式同$ajax
和axios
都不太一样,并且它本身的get请求同其他请求对数据的处理和herder也不太相同,所以为了统一请求行为,方便请求过程,将请求过程进行封装; -
fetch
请求的结果均返回到.then()中,但是平时的习惯是是在.then()
中处理正确结果,.catch()
中处理错误,所以对请求结果进行统一处理; -
fetch
本身没有 请求超时 这个概念,所以通过Promise.race
来处理,它的作用是多个promise同时运行,返回的结果以最快返回结果的那个promise的值为准。
Fetch for browser.
Install
$ npm isntall reco-fetch
Including reco-fetch
Script tag
<script src="/node_modules/reco-fetch/dist/recoFetch.min.js"></script>
Import
import recoFetch from 'reco-fetch'
Config
In addition to the parameters given below, please combine other parameters MDN.
/**
* @param {String, must} url API URL
* @param {String, must} options Parameter objects, including:
* method {String, optional} Request method, default 'get'
* headers {Object, optional} Set request header
* params {Object, optional} url parameters
* body {Object, optional} request body
* timeout {Number, optional} Request timeout
* type {String, optional} When 'post' requests, you can set: 'json', 'formData'
*/
const options = {
method: 'post',
headers: {},
timeout: 1000,
body: {
id: 1,
value: 2
}
}
recoFetch(url, options). then(res => {
console.log(res)
}).catch(err => {
console.log(err)
})
Example
GET
const options = {
method: 'get',
params: {
key: 1,
value: 2
}
}
recoFetch(url, options). then(res => {
console.log(res)
}).catch(err => {
console.log(err)
})
POST JSON
const options = {
method: 'post',
body: {
key: 1,
value: 2
},
type: 'json'
}
recoFetch(url, options). then(res => {
console.log(res)
}).catch(err => {
console.log(err)
})
POST formData
const options = {
method: 'post',
body: {
key: 1,
value: 2
},
type: 'formData'
}
// or
const form = document.querySelector('form')
const options = {
method: 'post',
body: form
}
recoFetch(url, options). then(res => {
console.log(res)
}).catch(err => {
console.log(err)
})
PUT
const options = {
method: 'put',
body: {
key: 1,
value: 2
},
type: 'json'
}
// or
const options = {
method: 'put',
body: JSON.stringify({
key: 1,
value: 2
})
}
recoFetch(url, options). then(res => {
console.log(res)
}).catch(err => {
console.log(err)
})
DELETE
const options = {
method: 'delete',
params: {
key: 1,
value: 2
}
}
recoFetch(url, options). then(res => {
console.log(res)
}).catch(err => {
console.log(err)
})
uploadFile
const fileField = document.querySelector("input[type='file']")
const options = {
method: 'post',
body: {
file: fileField.files[0]
},
type: 'formData'
}
// or
const formData = new FormData()
const fileField = document.querySelector("input[type='file']")
formData.append('file', fileField.files[0])
const options = {
method: 'post',
body: formData
}
recoFetch(url, options). then(res => {
console.log(res)
}).catch(err => {
console.log(err)
})
License
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