Detailed explanation of the steps for using Jsonp in VUE2.0
This time I will bring you a detailed explanation of the steps for using Jsonp in VUE2.0. What are the precautions for using Jsonp in VUE2.0. The following is a practical case, let's take a look.
1. The purpose and principle of JSONP
The main purpose of using JSONP is to dynamically create Scripts, dynamically splice URLs, and then capture data. Achieve cross-domain. To be precise, AJAX requests are not allowed to make cross-domain requests due to the same origin. However, the link in the src attribute of the Script tag can access cross-domain js scripts. Using this feature, the server no longer returns JSON format. Data, but returns a piece of JS code that calls a certain function, and calls it in the src attribute to achieve cross-domain.
2. How to use JSONP
2.1 Introduce jsonp from github
Open the project> ;package.json>Add code under "dependencies"
"jsonp": "^0.2.1"
such as As shown in the figure, then execute the installationcmd command and re-run the project
npm install npm run dev
2.2 Encapsulate jsonp.js
import originJSONP from 'jsonp'
export default function jsonp(url, data, option) {
url += (url.indexOf('?') < 0 ? '?' : '&') + param(data)
return new Promise((resolve, reject) => {
originJSONP(url, option, (err, data) => {
if (!err) {
resolve(data)
} else {
reject(err)
}
})
})
}
function param(data) {
let url = ''
for (var k in data) {
let value = data[k] !== undefined ? data[k] : ''
url += `&${k}=${encodeURIComponent(value)}`
}
// 删除第一个&
return url ? url.substring(1) : ''
}Directory structure is as follows:
2.3 API call of jsonp.js
Create an api folder under the src folder, For storing js for api calls, create two new files, config.js and recommendation.js.
config.js
export const commonParams = {
g_tK: 5381,
inCharset: 'utf-8',
outCharset: 'utf-8',
notice: 0,
format: 'jsonp'
}
export const options = {
param: 'jsonpCallback'
}
export const ERR_OK = 0
recommend.js
import jsonp from 'common/js/jsonp'
import {commonParams, options} from './config'
export function getRecommend() {
const url = 'https://c.y.qq.com/musichall/fcgi-bin/fcg_yqqhomepagerecommend.fcg' //此处的url可以自行修改，本文是qq音乐链接
const data = Object.assign({}, commonParams, {
platform: 'h5',
uin: 0,
needNewCode: 1
})
return jsonp(url, data, options)
}The directory structure is as follows:
2.4 recommend.vue file calls
# in the project directory ##src>components>recommend>Corresponding file.vue
<template>
<p class="recommend">
recommend
</p>
</template>
<script type="text/ecmascript-6">
import {getRecommend} from 'api/recommend'
import {ERR_OK} from 'api/config'
export default {
name: 'recommend',
created() {
this._getRecommend()
},
methods: {
_getRecommend() {
getRecommend().then((res) => {
if (res.code === ERR_OK) {
console.log(res.data.slider)
}
})
}
}
}
</script>2.5 Page jsonp request success result
Detailed explanation of the steps to add and delete tables using Vue.js
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