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现在流行的 axios 库不支持 jsonp，因此这里推荐一个 jsonp 库，简单易用。以下是介绍：
Easy JSONP
A minimal and lightweight JSONP implementation which is used to be a kind of cross domain solutions.
Features
Implement JSONP request from the browser
Combine URL query parameters by default behavior
Support the [Promise] API
Limit JSONP request period
Handle network error response
Install
# using npm
npm i easy-jsonp
# using yarn
yarn add easy-jsonp
# using script target
<script src=”jsonp.js”></script>
Usage
JSONP only support GET methods, same as easy-JSONP.
The code below show you how to use package as a dependency
// as a request dependency named jsonp
import jsonp from ‘easy-jsonp’
const jsonp = require(‘easy-jsonp’).default
jsonp({
url: ‘http://localhost’,
// global function named `callback` will be invoked when JSONP response
callback: ‘callback’, // any different name from request module
timeout: 3000,
params: {
// eg. ?key0=0&key1=1…
key0: 0,
key1: 1
}
})
.then(res => console.log(res))
.catch(err => console.error(err))
⚠️ Notice: Parameter callback value MUST NOT be same as request module name (eg. dependency named jsonp above code), otherwise request module only works once and function named value of parameter callback will be reset to null (internal implementation) which means the same name request module will be also reset unexpectedly.
For more customization capability, This package wouldn’t convert callback to a new name to prevent unexpected reset.
jsonp({
// custom configuration
})
⚠️ Notice: For same reason, parameter callback value MUST NOT be jsonp.
Parameters
options parameter
type
required
description
url
String
true
JSONP request address
timeout
Number
false, default : 6000 milliseconds
how long after timeout error is emitted. 0 to disable
callback
String
false, default : ‘jsonpCallback’+Date.now()
global callback function name which is used to handle JSONP response.
params
Object
false, default: {}
other parameters in query string parameters
Notice
Uncaught SyntaxError: Unexpected token :error
It mostly doesn’t support JSONP request when you are calling a JSON api. The difference between JSON api and JSONP is that JSON api response with an object like {num: 1} (It will throw a error when client executed this response as a function.). On the other hand, JSONP will respond with a function wrapped object like callback({num: 1}) and we will get what we need when client executed this response as a function.
