vue는 어떻게 반복 요청을 방지하나요? 다음 글에서는 Vue가 반복 요청을 방지하는 두 가지 방법을 소개하겠습니다. 도움이 되길 바랍니다.
프로젝트의 프런트 엔드 코드는 동일한 요청이 서버에 여러 번 전송되는 상황에 직면하게 됩니다. 동일한 요청은 특정 기간에 한 번만 전송되도록 허용됩니다. of time
(1) 동일한 버튼을 여러 번 클릭하는 것을 방지하는 등 비즈니스가 간단한 경우 흔들림 방지 처리를 위해 타이머를 사용할 수 있습니다.
(2) 다음과 같이 비즈니스가 복잡한 경우 여러 구성 요소가 코드를 통과하고 동일한 요청이 여러 번 전송되는 경우 이미 흔들림 방지가 처리되어 있으므로 반복되는 Ajax 요청을 통일된 방식으로 취소하는 것이 가장 좋습니다
방법 1 - 타이머를 통한 흔들림 방지 처리
효과 : 사용자가 동일한 버튼을 여러 번 연속 클릭하면 짧은 시간 후에 요청이 시작됩니다. 마지막 클릭 후 시간
Principle: 각 메소드가 호출된 후 타이머가 생성되고, 타이머가 만료된 후에 요청이 전송됩니다. 메소드를 반복적으로 호출하면 현재 타이머가 취소되고, 새 타이머를 만든 후 전송됩니다. lodash
의 debounce code> 메소드와 같은 타사 캡슐화된 도구 기능을 사용하여 흔들림 방지 코드를 단순화할 수 있습니다. [관련 권장 사항: <a href="https://www.php.cn/course/list/18.html" target="_blank" textvalue="vuejs 비디오 튜토리얼">vuejs 비디오 튜토리얼<code>lodash
的debounce
方法来简化防抖的代码 【相关推荐:vuejs视频教程、web前端开发】
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/lodash.js/4.17.21/lodash.min.js" type="application/javascript"></script> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.min.js" type="application/javascript"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/axios/0.26.0/axios.min.js" type="application/javascript"></script> </head> <body> <div id="app"> <button @click="onClick">请求</button> </div> </body> <script> // 定义请求接口 function sendPost(data){ return axios({ url: 'https://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', method: 'post', data }) } new Vue({ el: '#app', methods: { // 调用lodash的防抖方法debounce,实现连续点击按钮多次,0.3秒后调用1次接口 onClick: _.debounce(async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求的结果', res.data) }, 300), }, }) </script> </html>
无法解决多个按钮件的重复请求的发送问题,例如下面两种情况
按钮事件间是相互独立的,调用的是不同方法,做不到按钮间防抖效果
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/lodash.js/4.17.21/lodash.min.js" type="application/javascript"></script> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.min.js" type="application/javascript"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/axios/0.26.0/axios.min.js" type="application/javascript"></script> </head> <body> <div id="app"> <button @click="onClick1" ref="btn1">请求1</button> <button @click="onClick2" ref="btn2">请求2</button> </div> </body> <script> let sendPost = function(data){ return axios({ url: 'http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', method: 'post', data }) } new Vue({ el: '#app', mounted() { this.$refs.btn1.click() this.$refs.btn2.click() }, methods: { // 使用lodash对请求方法做防抖 //这里有问题,只是对每个按钮的点击事件单独做了防抖,但是两个按钮之间做不到防抖的效果 onClick1: _.debounce(async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求1的结果', res.data) }, 300), onClick2: _.debounce(async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求2的结果', res.data) }, 300), }, }) </script> </html>
按钮间调用的方法是相同的,是可以对方法做防抖处理,但是处理本身对方法做了一次封装,会影响到之前方法的返回值接收,需要对之前的方法做更多处理,变得更加复杂,不推荐
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/lodash.js/4.17.21/lodash.min.js" type="application/javascript"></script> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.min.js" type="application/javascript"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/axios/0.26.0/axios.min.js" type="application/javascript"></script> </head> <body> <div id="app"> <button @click="onClick1" ref="btn1">请求1</button> <button @click="onClick2" ref="btn2">请求2</button> </div> </body> <script> // 使用lodash对请求方法做防抖, let sendPost = _.debounce(function(data){ //这里有问题,这里的返回值不能作为sendPost方法执行的返回值,因为debounce内部包裹了一层 return axios({ url: 'http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', method: 'post', data }) }, 300) new Vue({ el: '#app', mounted() { this.$refs.btn1.click() this.$refs.btn2.click() }, methods: { onClick1: async function(){ //这里有问题,sendPost返回值不是promise,而是undefined let res = await sendPost({username:'zs', age: 20}) console.log('请求1的结果', res) }, onClick2: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求2的结果', res) }, }, }) </script> </html>
方式2-通过取消ajax请求
直接对请求方法做处理,通过ajax库的api方法把重复的请求给取消掉
通过调用XMLHttpRequest
对象实例的abort
方法把请求给取消掉
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> </body> <script> //原生ajax的语法 let xhr = new XMLHttpRequest(); xhr.open("GET", "http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test?username=zs&age=20", true); xhr.onload = function(){ console.log(xhr.responseText) } xhr.send(); //在谷歌浏览器的低速3g下面测试 //通过XMLHttpRequest实例的abort方法取消请求 setTimeout(() => xhr.abort(), 100); </script> </html>
通过axios
的CancelToken
对象实例cancel
方法把请求给取消掉
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/axios/0.26.0/axios.min.js" type="application/javascript"></script> </head> <body> </body> <script> /*axios的取消的语法*/ // 方式1-通过axios.CancelToken.source产生cancelToken和cancel方法 /* const source = axios.CancelToken.source(); axios.get('http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', { params: {username: 'zs', age: 20}, cancelToken: source.token }).then(res=>{ console.log('res', res.data) }).catch(err=>{ console.log('err', err) }) //在谷歌浏览器的低速3g下面测试 //通过调用source的cancel方法取消 setTimeout(() => source.cancel(), 100); */ /**/ // 方式2-通过new axios.CancelToken产生cancelToken和cancel方法 let cancelFn const cancelToken = new axios.CancelToken(cancel=>{ cancelFn = cancel }); axios.get('http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', { params: {username: 'zs', age: 20}, cancelToken: cancelToken }).then(res=>{ console.log('res', res.data) }).catch(err=>{ console.log('err', err) }) //在谷歌浏览器的低速3g下面测试 //通过调用cancelFn方法取消 setTimeout(() => cancelFn(), 100); </script> </html>
通过axios
请求拦截器,在每次请求前把请求信息和请求的取消方法放到一个map对象当中,并且判断map对象当中是否已经存在该请求信息的请求,如果存在取消上传请求
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.min.js" type="application/javascript"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/axios/0.26.0/axios.min.js" type="application/javascript"></script> <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/qs/6.10.3/qs.js" type="application/javascript"></script> </head> <body> <div id="app"> <button @click="onClick1" ref="btn1">请求1</button> <button @click="onClick2" ref="btn2">请求2</button> </div> </body> <script> //存储请求信息和取消方法的的map对象 const pendingRequest = new Map(); //根据请求的信息(请求方式,url,请求get/post数据),产生map的key function getRequestKey(config){ const { method, url, params, data } = config; return [method, url, Qs.stringify(params), Qs.stringify(data)].join("&"); } //请求拦截器 axios.interceptors.request.use( function (config) { //根据请求的信息(请求方式,url,请求get/post数据),产生map的key let requestKey = getRequestKey(config) //判断请求是否重复 if(pendingRequest.has(requestKey)){ //取消上次请求 let cancel = pendingRequest.get(requestKey) cancel() //删除请求信息 pendingRequest.delete(requestKey) } //把请求信息,添加请求到map当中 // 生成取消方法 config.cancelToken = config.cancelToken || new axios.CancelToken(cancel => { // 把取消方法添加到map if (!pendingRequest.has(requestKey)) { pendingRequest.set(requestKey, cancel) } }) return config; }, (error) => { return Promise.reject(error); } ); let sendPost = function(data){ return axios({ url: 'http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', method: 'post', data }) } new Vue({ el: '#app', mounted() { this.$refs.btn1.click() this.$refs.btn2.click() }, methods: { // 使用lodash对请求方法做防抖 //这里有问题,只是对每个按钮的点击事件单独做了防抖,但是两个按钮之间做不到防抖的效果 onClick1: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求1的结果', res.data) }, onClick2: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求2的结果', res.data) }, }, }) </script> </html>
通过axios
, 웹 프론트엔드 개발
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.min.js" type="application/javascript"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/axios/0.26.0/axios.min.js" type="application/javascript"></script> <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/qs/6.10.3/qs.js" type="application/javascript"></script> </head> <body> <div id="app"> <button @click="onClick1" ref="btn1">请求1</button> <button @click="onClick2" ref="btn2">请求2</button> </div> </body> <script> //存储请求信息和取消方法的的map对象 const pendingRequest = new Map(); //根据请求的信息(请求方式,url,请求get/post数据),产生map的key function getRequestKey(config){ const { method, url, params, data } = config; return [method, url, Qs.stringify(params), Qs.stringify(data)].join("&"); } //请求拦截器 axios.interceptors.request.use( function (config) { //根据请求的信息(请求方式,url,请求get/post数据),产生map的key let requestKey = getRequestKey(config) //判断请求是否重复 if(pendingRequest.has(requestKey)){ //取消上次请求 let cancel = pendingRequest.get(requestKey) cancel() //删除请求信息 pendingRequest.delete(requestKey) } //把请求信息,添加请求到map当中 // 生成取消方法 config.cancelToken = config.cancelToken || new axios.CancelToken(cancel => { // 把取消方法添加到map if (!pendingRequest.has(requestKey)) { pendingRequest.set(requestKey, cancel) } }) return config; }, (error) => { return Promise.reject(error); } ); //响应拦截器 axios.interceptors.response.use( (response) => { //请求成功 //删除请求的信息 let requestKey = getRequestKey(response.config) if(pendingRequest.has(requestKey)){ pendingRequest.delete(requestKey) } return response; }, (error) => { return Promise.reject(error); } ); let sendPost = function(data){ return axios({ url: 'http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', method: 'post', data }) } new Vue({ el: '#app', mounted() { this.$refs.btn1.click() this.$refs.btn2.click() }, methods: { // 使用lodash对请求方法做防抖 //这里有问题,只是对每个按钮的点击事件单独做了防抖,但是两个按钮之间做不到防抖的效果 onClick1: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求1的结果', res.data) }, onClick2: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求2的结果', res.data) }, }, }) </script> </html>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.min.js" type="application/javascript"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/axios/0.26.0/axios.min.js" type="application/javascript"></script> <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/qs/6.10.3/qs.js" type="application/javascript"></script> </head> <body> <div id="app"> <button @click="onClick1" ref="btn1">请求1</button> <button @click="onClick2" ref="btn2">请求2</button> </div> </body> <script> //存储请求信息和取消方法的的map对象 const pendingRequest = new Map(); //根据请求的信息(请求方式,url,请求get/post数据),产生map的key function getRequestKey(config){ const { method, url, params, data } = config; return [method, url, Qs.stringify(params), Qs.stringify(data)].join("&"); } //请求拦截器 axios.interceptors.request.use( function (config) { //根据请求的信息(请求方式,url,请求get/post数据),产生map的key let requestKey = getRequestKey(config) //判断请求是否重复 if(pendingRequest.has(requestKey)){ //取消上次请求 let cancel = pendingRequest.get(requestKey) cancel() //删除请求信息 pendingRequest.delete(requestKey) } //把请求信息,添加请求到map当中 // 生成取消方法 config.cancelToken = config.cancelToken || new axios.CancelToken(cancel => { // 把取消方法添加到map if (!pendingRequest.has(requestKey)) { pendingRequest.set(requestKey, cancel) } }) return config; }, (error) => { return Promise.reject(error); } ); //删除请求信息 function delPendingRequest(config){ let requestKey = getRequestKey(config) if(pendingRequest.has(requestKey)){ pendingRequest.delete(requestKey) } } //响应拦截器 axios.interceptors.response.use( (response) => { //请求成功 //删除请求的信息 delPendingRequest(response.config) return response; }, (error) => { //请求失败 //不是取消请求的错误 if (!axios.isCancel(error)){ //服务器报400,500报错,删除请求信息 delPendingRequest(error.config || {}) } return Promise.reject(error); } ); let sendPost = function(data){ return axios({ url: 'http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', method: 'post', data }) } new Vue({ el: '#app', mounted() { this.$refs.btn1.click() this.$refs.btn2.click() }, methods: { // 使用lodash对请求方法做防抖 //这里有问题,只是对每个按钮的点击事件单独做了防抖,但是两个按钮之间做不到防抖的效果 onClick1: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求1的结果', res.data) }, onClick2: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求2的结果', res.data) }, }, }) </script> </html>
XMLHttpRequest
개체 인스턴스의 abort
메서드를 호출하여 요청을 취소하세요🎜rrreee🎜미리보기 🎜 🎜axios</code의 <code>CancelToken
객체 인스턴스 cancel
메서드를 통해 > 요청 취소🎜rrreee🎜미리보기 🎜🎜axios
를 통해 인터셉터를 요청하고, 각 요청 전에 요청 정보와 요청한 취소 메서드를 맵 객체에 넣고 맵 객체가 이루어졌는지 여부를 확인합니다. 업로드 취소 요청이 있는 경우🎜rrreee🎜미리보기 🎜🎜axios
의 응답 인터셉터를 통해 요청 성공 후 맵 객체에 있는 요청 정보의 데이터를 삭제합니다🎜rrreee🎜🎜Preview🎜🎜通过axios
的响应拦截器,在请求失败后在map对象当中,删除该请求信息的数据
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.min.js" type="application/javascript"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/axios/0.26.0/axios.min.js" type="application/javascript"></script> <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/qs/6.10.3/qs.js" type="application/javascript"></script> </head> <body> <div id="app"> <button @click="onClick1" ref="btn1">请求1</button> <button @click="onClick2" ref="btn2">请求2</button> </div> </body> <script> //存储请求信息和取消方法的的map对象 const pendingRequest = new Map(); //根据请求的信息(请求方式,url,请求get/post数据),产生map的key function getRequestKey(config){ const { method, url, params, data } = config; return [method, url, Qs.stringify(params), Qs.stringify(data)].join("&"); } //请求拦截器 axios.interceptors.request.use( function (config) { //根据请求的信息(请求方式,url,请求get/post数据),产生map的key let requestKey = getRequestKey(config) //判断请求是否重复 if(pendingRequest.has(requestKey)){ //取消上次请求 let cancel = pendingRequest.get(requestKey) cancel() //删除请求信息 pendingRequest.delete(requestKey) } //把请求信息,添加请求到map当中 // 生成取消方法 config.cancelToken = config.cancelToken || new axios.CancelToken(cancel => { // 把取消方法添加到map if (!pendingRequest.has(requestKey)) { pendingRequest.set(requestKey, cancel) } }) return config; }, (error) => { return Promise.reject(error); } ); //删除请求信息 function delPendingRequest(config){ let requestKey = getRequestKey(config) if(pendingRequest.has(requestKey)){ pendingRequest.delete(requestKey) } } //响应拦截器 axios.interceptors.response.use( (response) => { //请求成功 //删除请求的信息 delPendingRequest(response.config) return response; }, (error) => { //请求失败 //不是取消请求的错误 if (!axios.isCancel(error)){ //服务器报400,500报错,删除请求信息 delPendingRequest(error.config || {}) } return Promise.reject(error); } ); let sendPost = function(data){ return axios({ url: 'http://nodejs-cloud-studio-demo-bkzxs.nodejs-cloud-studio-demo.50185620.cn-hangzhou.fc.devsapp.net/test', method: 'post', data }) } new Vue({ el: '#app', mounted() { this.$refs.btn1.click() this.$refs.btn2.click() }, methods: { // 使用lodash对请求方法做防抖 //这里有问题,只是对每个按钮的点击事件单独做了防抖,但是两个按钮之间做不到防抖的效果 onClick1: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求1的结果', res.data) }, onClick2: async function(){ let res = await sendPost({username:'zs', age: 20}) console.log('请求2的结果', res.data) }, }, }) </script> </html>
위 내용은 이 글에서는 Vue가 반복 요청을 방지하는 방법에 대해 이야기해 보겠습니다.의 상세 내용입니다. 자세한 내용은 PHP 중국어 웹사이트의 기타 관련 기사를 참조하세요!