vue3前端后端地址可配置方案

在开发vue3项目过程中，需要切换不同的服务器部署，代码中配置的服务需要可灵活配置，不随着run npm build把网址打包到代码资源中，不然每次切换都需要重新run npm build。需要一个配置文件可以修改服务地址，而打包的代码资源直接copy就可以了。

记录一下下面的方法

vue3项目跟路径下创建proxy.js，并且地址写在proxy.js中，挂载到window对象上

window.APP_config = {apiBaseURL: 'http://localhost:8080',wsBaseURL: 'ws://localhost:8080/ws',};

项目的index.html中延迟加载proxy.js文件

<!doctype html>
<html lang="en"><head><meta charset="UTF-8" /><link rel="icon" type="image/png" href="/icon.png" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>KXJL Chat OCR</title></head><body><div id="app"></div><script type="module" src="/src/main.js"></script><script src="/proxy.js" defer></script></body>
</html>

main.js中注入，需要监听dom事件，只有dom加载完成才能调用window对象的属性

import { createApp } from 'vue'
import './style.css'
import App from './App.vue'
import router from './router/router.js'
import ElementPlus  from 'element-plus'
import 'element-plus/theme-chalk/index.css'
import * as ElementPlusIconsVue from '@element-plus/icons-vue'
import axios from "axios"var app = createApp(App)// 使用 DOMContentLoaded 事件确保 DOM 加载完成后再访问 window.APP_config
document.addEventListener('DOMContentLoaded', () => {if (window.APP_config) {// 注入配置到 Vue 应用中app.provide('APP_config', window.APP_config);}for (const [key, component] of Object.entries(ElementPlusIconsVue)) {app.component(key, component)}router.isReady().then(() => {if (router.currentRoute.value.path !== '/') {router.push('/');}});app.provide('axios', axios)app.use(router)app.use(ElementPlus)app.mount('#app')});

其他任何地方可调用

import { ref, onMounted, onUnmounted, inject } from 'vue';
const APP_config = inject('APP_config');
console.log(APP_config)
const ws_url = APP_config.wsBaseURL    
console.log("ws_url", ws_url)

ws的调用

<template lang=""><div class="imgocrinfer"><div class="input"><div class="imgup"><el-uploadclass="upload-demo"dragaction=""multiple:auto-upload="false":on-change="handleFileChange":on-remove="handleRemove"><el-icon class="el-icon--upload"><Plus /></el-icon><div class="el-upload__text">点击或拖拽文件到此处上传</div><div class="el-upload__text">支持jpg、png</div><template #tip><div class="el-upload__tip">jpg/png files with a size less than 500kb</div></template></el-upload></div><div class="prompt_input"><el-input class="textarea" v-model="prompt"  type="textarea"  placeholder="请输入提示词" @input="on_input_change"> </el-input></div><div class="submit"><el-button type="primary" plain :icon="Edit" @click="on_click">点击OCR识别</el-button></div></div><div class="imgshow"><div><span>图片预览</span></div><div class="imgPreview" ref="imageRef" style=" margin-top:10px"><img v-if="previewImage" :src="previewImage" alt="Preview Imag" @load="onImageLoad"></div></div><div class="textshow"><div><span>文字识别结果</span></div><div style="margin-top:10px"><el-input class="textarea"  v-model="text_result"  type="textarea"  placeholder="" > </el-input></div></div></div>
</template><script setup>import { ref, onMounted, onUnmounted, inject } from 'vue';import { Edit } from '@element-plus/icons-vue';const text_result = ref("");const previewImage = ref('');const prompt = ref('');const image_base64_str = ref("")const imageRef = ref(null);const imgWidth = ref("");const imgHeight = ref("");const maxImageWidth = ref('');const maxImageHeight = ref('');const ws = ref(null);const isConnected = ref(false);const APP_config = inject('APP_config');console.log(APP_config)const ws_url = APP_config.wsBaseURL    console.log("ws_url", ws_url)const connectWebSocket =() =>{ws.value = new WebSocket(ws_url);ws.value.onopen = onOpenHandler;ws.value.onmessage = (event) => {        text_result.value += event.data// 如果这是最后一条预期的消息，关闭连接if ( event.data.isLastMessage) {ws.value.close()}};ws.value.onclose = (event) => {isConnected.value = falseconsole.log('WebSocket connection closed', event);};ws.value.onerror = (error) => {console.error('WebSocket error', error);};}onUnmounted(()=>{if (ws.value && ws.value.readyState === WebSocket.OPEN){ws.value.close()}})const onOpenHandler = () => {isConnected.value = true;sendTextAndImage()}const on_input_change = () =>{text_result.value = ""}// 发送数据async function sendTextAndImage() {console.log("sendTextAndImage")const payload = {"text":prompt.value,"image_base64_str": image_base64_str.value,};if (isConnected.value && prompt.value && image_base64_str.value){console.log("payload: ", payload)ws.value.send(JSON.stringify(payload));}}const handleFileChange = (file, uploadFiles) =>{if (uploadFiles.length >= 2){uploadFiles.splice(0,uploadFiles.length-1)}if(file.raw && file.raw.type.startsWith("image/")){const reader = new FileReader()reader.onload = (e) => {previewImage.value = e.target.resultimage_base64_str.value = e.target.result.split(",")[1]let img = new Image()img.src = e.target.resultimg.onload=()=>{imgWidth.value = img.widthimgHeight.value = img.height if (imgWidth.value > imgHeight.value) {// 如果图片宽度大于高度，则限制宽度maxImageWidth.value = "100%";maxImageHeight.value = "auto";} else {// 否则，限制高度maxImageWidth.value = 'auto';maxImageHeight.value = `100%`;}}}reader.readAsDataURL(file.raw)}else{ElMessage.error('Please upload an image file.')}};const handleRemove = (file, uploadFiles) =>{    if (uploadFiles.length ==0){previewImage.value = ""prompt.value = ""text_result.value = ""}};const onImageLoad = () => {// 在图片加载完成后，强制浏览器重新计算尺寸// 这可以通过触发一个重排或重绘来实现requestAnimationFrame(() => {// 强制浏览器重排const imgElement = document.querySelector('img')imgElement.style.width = maxImageWidth.value;imgElement.style.height = maxImageHeight.value});};const on_click = ()=>{if ( ! prompt.value && !image_base64_str.value){alert("prompt 和 图片不能为空，请重新输入")}text_result.value = ""if (! isConnected.value){connectWebSocket()}// onOpenHandler()// prompt.value = ""// image_base64_str.value = ""}defineOptions({name: 'imgOcrInference',});
</script><style lang="scss">
.imgocrinfer{display: flex;.input{width: 14.7vw;height: 90vh;border:2px solid #ffffff;box-shadow: 1px 0 4px #8c9eb11a;border-radius: 8px;.imgup{width: 14.7vw;height: 30vh;border:2px solid #ffffff;box-shadow: 1px 0 4px #8c9eb11a;border-radius: 8px;.el-upload{width: 14.3vw;}}.prompt_input{height: 15vh;.el-textarea__inner{width: 14.3vw;resize: none;height: 100px;}}.submit{width: 14.3vw;.el-button {width: 14.3vw;}}}.imgshow{height: 600px;width: 29.5vw;border:2px solid #ffffff;box-shadow: 1px 0 4px #8c9eb11a;border-radius: 8px;margin-left: 1vw;.imgPreview{border:2px solid rgb(167, 200, 238);height: 58vh;border-radius: 8px;}}.textshow{width: 19.8vw;border:2px solid #ffffff;box-shadow: 1px 0 4px #8c9eb11a;border-radius: 8px;.el-textarea__inner{width: 19.8vw;height: 58vh;}}
}
</style>

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