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本文旨在解决vue3版本下uniapp h5项目向app项目中webview通讯问题
问题产生于uniapp不支持vue3使用template.h5.html 自定义打包模板

h5向app发送信息

有很多文章指出h5项目使用uni.postmessage 这个api需要在template.h5.html引入一个js文件 然后改下webuni变量再从manifest.json配置下改文件 就可以全文使用了

vue2环境是可以参考的
文章指向通信跳转文章

但这方案在vue3环境下是无法使用的

vue3的解决方案是直接在需要使用的页面import引入该文件
直接调用webUni.postMessage即可

<script lang="ts" setup>import { MessageUtil } from "@/utils/MessageUtil";import webUni from '@/static/js/uni.webview.js'const saveImage = ()=>{webUni.postMessage({ data: { action: 'download', data: 'http://mj-1302596703.cos.ap-guangzhou.myqcloud.com/file/ttc7sKc4g0mcSL2KbtJg.png' } });}
</script>

接下来的问题就细化成将js文件改造成可支持model暴露了

const webUni = (function() {"use strict";try {var e = {};Object.defineProperty(e, "passive", {get: function() {return true;}}), window.addEventListener("test-passive", null, e)} catch (e) {}var n = Object.prototype.hasOwnProperty;function t(e, t) {return n.call(e, t);}var i = [],a = function(e, n) {var t = {options: {timestamp: +new Date},name: e,arg: n};if (window.__dcloud_weex_postMessage || window.__dcloud_weex_) {if ("postMessage" === e) {var a = {data: [n]};return window.__dcloud_weex_postMessage ? window.__dcloud_weex_postMessage(a) : window.__dcloud_weex_.postMessage(JSON.stringify(a));}var o = {type: "WEB_INVOKE_APPSERVICE",args: {data: t,webviewIds: i}};window.__dcloud_weex_postMessage ? window.__dcloud_weex_postMessageToService(o) : window.__dcloud_weex_.postMessageToService(JSON.stringify(o));}if (!window.plus) return window.parent.postMessage({type: "WEB_INVOKE_APPSERVICE",data: t,pageId: ""}, "*");if (0 === i.length) {var r = plus.webview.currentWebview();if (!r) throw new Error("plus.webview.currentWebview() is undefined");var d = r.parent(),s = "";s = d ? d.id : r.id, i.push(s);}if (plus.webview.getWebviewById("__uniapp__service")) plus.webview.postMessageToUniNView({type: "WEB_INVOKE_APPSERVICE",args: {data: t,webviewIds: i}}, "__uniapp__service");else {var w = JSON.stringify(t);plus.webview.getLaunchWebview().evalJS('UniPlusBridge.subscribeHandler("'.concat("WEB_INVOKE_APPSERVICE", '",').concat(w, ",").concat(JSON.stringify(i), ");"));}},o = {navigateTo: function(e) {var n = e.url;a("navigateTo", {url: encodeURI(n)});},navigateBack: function(e) {var n = e.delta;a("navigateBack", {delta: parseInt(n) || 1});},switchTab: function(e) {var n = e.url;a("switchTab", {url: encodeURI(n)});},reLaunch: function(e) {var n = e.url;a("reLaunch", {url: encodeURI(n)});},redirectTo: function(e) {var n = e.url;a("redirectTo", {url: encodeURI(n)});},getEnv: function(callback) {window.plus ? callback({plus: true}) : callback({h5: true});},postMessage: function(e) {a("postMessage", e.data || {});}};return o;
})();export default webUni;

直接将其替换官方提供的文件代码就能使用了
app接收

<web-view :webview-styles="webviewStyles" :src="url" @message="handlePostMessage"></web-view>handlePostMessage(evt) {let data = evt.detail.data[0];const action = data?.action;switch (action) {case 'download': {saveFileToPhotosAlbum(data.data)break;}}},