需求：
1、需要在Uniapp开发的APP或小程序页面嵌入一个H5网页，需要拿到H5给APP传递的数据。
2、并且这个H5是使用vue+vant开发的。（其实跟使用uniapp开发H5一样）
实现步骤：
1、首先需要兼容多端和App端，因此这里需要在h5项目的index.html文件引入多个js。
给app端传递需要引入uni.webview.1.5.5.js （这里是改后的1.5.5版本 把uni地方该为了webUni）
!function(e,n){"object"==typeof exports&&"undefined"!=typeof module?module.exports=n():"function"==typeof define&&define.amd?define(n):(e=e||self).webUni=n()}(this,(function(){"use strict";try{var e={};Object.defineProperty(e,"passive",{get:function(){!0}}),window.addEventListener("test-passive",null,e)}catch(e){}var n=Object.prototype.hasOwnProperty;function i(e,i){return n.call(e,i)}var t=[];function o(){return window.__dcloud_weex_postMessage||window.__dcloud_weex_}function a(){return window.__uniapp_x_postMessage||window.__uniapp_x_}var r=function(e,n){var i={options:{timestamp:+new Date},name:e,arg:n};if(a()){if("postMessage"===e){var r={data:n};return window.__uniapp_x_postMessage?window.__uniapp_x_postMessage(r):window.__uniapp_x_.postMessage(JSON.stringify(r))}var d={type:"WEB_INVOKE_APPSERVICE",args:{data:i,webviewIds:t}};window.__uniapp_x_postMessage?window.__uniapp_x_postMessageToService(d):window.__uniapp_x_.postMessageToService(JSON.stringify(d))}else if(o()){if("postMessage"===e){var s={data:[n]};return window.__dcloud_weex_postMessage?window.__dcloud_weex_postMessage(s):window.__dcloud_weex_.postMessage(JSON.stringify(s))}var w={type:"WEB_INVOKE_APPSERVICE",args:{data:i,webviewIds:t}};window.__dcloud_weex_postMessage?window.__dcloud_weex_postMessageToService(w):window.__dcloud_weex_.postMessageToService(JSON.stringify(w))}else{if(!window.plus)return window.parent.postMessage({type:"WEB_INVOKE_APPSERVICE",data:i,pageId:""},"*");if(0===t.length){var u=plus.webview.currentWebview();if(!u)throw new Error("plus.webview.currentWebview() is undefined");var g=u.parent(),v="";v=g?g.id:u.id,t.push(v)}if(plus.webview.getWebviewById("__uniapp__service"))plus.webview.postMessageToUniNView({type:"WEB_INVOKE_APPSERVICE",args:{data:i,webviewIds:t}},"__uniapp__service");else{var c=JSON.stringify(i);plus.webview.getLaunchWebview().evalJS('UniPlusBridge.subscribeHandler("'.concat("WEB_INVOKE_APPSERVICE",'",').concat(c,",").concat(JSON.stringify(t),");"))}}},d={navigateTo:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},n=e.url;r("navigateTo",{url:encodeURI(n)})},navigateBack:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},n=e.delta;r("navigateBack",{delta:parseInt(n)||1})},switchTab:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},n=e.url;r("switchTab",{url:encodeURI(n)})},reLaunch:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},n=e.url;r("reLaunch",{url:encodeURI(n)})},redirectTo:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},n=e.url;r("redirectTo",{url:encodeURI(n)})},getEnv:function(e){a()?e({uvue:!0}):o()?e({nvue:!0}):window.plus?e({plus:!0}):e({h5:!0})},postMessage:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};r("postMessage",e.data||{})}},s=/uni-app/i.test(navigator.userAgent),w=/Html5Plus/i.test(navigator.userAgent),u=/complete|loaded|interactive/;var g=window.my&&navigator.userAgent.indexOf(["t","n","e","i","l","C","y","a","p","i","l","A"].reverse().join(""))>-1;var v=window.swan&&window.swan.webView&&/swan/i.test(navigator.userAgent);var c=window.qq&&window.qq.miniProgram&&/QQ/i.test(navigator.userAgent)&&/miniProgram/i.test(navigator.userAgent);var p=window.tt&&window.tt.miniProgram&&/toutiaomicroapp/i.test(navigator.userAgent);var _=window.wx&&window.wx.miniProgram&&/micromessenger/i.test(navigator.userAgent)&&/miniProgram/i.test(navigator.userAgent);var m=window.qa&&/quickapp/i.test(navigator.userAgent);var f=window.ks&&window.ks.miniProgram&&/micromessenger/i.test(navigator.userAgent)&&/miniProgram/i.test(navigator.userAgent);var l=window.tt&&window.tt.miniProgram&&/Lark|Feishu/i.test(navigator.userAgent);var E=window.jd&&window.jd.miniProgram&&/micromessenger/i.test(navigator.userAgent)&&/miniProgram/i.test(navigator.userAgent);var x=window.xhs&&window.xhs.miniProgram&&/xhsminiapp/i.test(navigator.userAgent);for(var S,h=function(){window.UniAppJSBridge=!0,document.dispatchEvent(new CustomEvent("UniAppJSBridgeReady",{bubbles:!0,cancelable:!0}))},y=[function(e){if(s||w)return window.__uniapp_x_postMessage||window.__uniapp_x_||window.__dcloud_weex_postMessage||window.__dcloud_weex_?document.addEventListener("DOMContentLoaded",e):window.plus&&u.test(document.readyState)?setTimeout(e,0):document.addEventListener("plusready",e),d},function(e){if(_)return window.WeixinJSBridge&&window.WeixinJSBridge.invoke?setTimeout(e,0):document.addEventListener("WeixinJSBridgeReady",e),window.wx.miniProgram},function(e){if(c)return window.QQJSBridge&&window.QQJSBridge.invoke?setTimeout(e,0):document.addEventListener("QQJSBridgeReady",e),window.qq.miniProgram},function(e){if(g){document.addEventListener("DOMContentLoaded",e);var n=window.my;return{navigateTo:n.navigateTo,navigateBack:n.navigateBack,switchTab:n.switchTab,reLaunch:n.reLaunch,redirectTo:n.redirectTo,postMessage:n.postMessage,getEnv:n.getEnv}}},function(e){if(v)return document.addEventListener("DOMContentLoaded",e),window.swan.webView},function(e){if(p)return document.addEventListener("DOMContentLoaded",e),window.tt.miniProgram},function(e){if(m){window.QaJSBridge&&window.QaJSBridge.invoke?setTimeout(e,0):document.addEventListener("QaJSBridgeReady",e);var n=window.qa;return{navigateTo:n.navigateTo,navigateBack:n.navigateBack,switchTab:n.switchTab,reLaunch:n.reLaunch,redirectTo:n.redirectTo,postMessage:n.postMessage,getEnv:n.getEnv}}},function(e){if(f)return window.WeixinJSBridge&&window.WeixinJSBridge.invoke?setTimeout(e,0):document.addEventListener("WeixinJSBridgeReady",e),window.ks.miniProgram},function(e){if(l)return document.addEventListener("DOMContentLoaded",e),window.tt.miniProgram},function(e){if(E)return window.JDJSBridgeReady&&window.JDJSBridgeReady.invoke?setTimeout(e,0):document.addEventListener("JDJSBridgeReady",e),window.jd.miniProgram},function(e){if(x)return window.xhs.miniProgram},function(e){return document.addEventListener("DOMContentLoaded",e),d}],M=0;M<y.length&&!(S=y[M](h));M++);S||(S={});var P="undefined"!=typeof webUni?webUni:{};if(!P.navigateTo)for(var b in S)i(S,b)&&(P[b]=S[b]);return P.webView=S,P}));
其他多端需要引入不同端的js（这里是多家小程序引入的js）
<script type="text/javascript">
var userAgent = navigator.userAgent;
if (userAgent.indexOf('AlipayClient') > -1) {
// 支付宝小程序的 JS-SDK 防止 404 需要动态加载，如果不需要兼容支付宝小程序，则无需引用此 JS 文件。
document.writeln('<script src="https://appx/web-view.min.js"' + '>' + '<' + '/' + 'script>');
} else if (/QQ/i.test(userAgent) && /miniProgram/i.test(userAgent)) {
// QQ 小程序
document.write(
'<script type="text/javascript" src="https://qqq.gtimg.cn/miniprogram/webview_jssdk/qqjssdk-1.0.0.js"><\/script>'
);
} else if (/miniProgram/i.test(userAgent) && /micromessenger/i.test(userAgent)) {
// 微信小程序 JS-SDK 如果不需要兼容微信小程序，则无需引用此 JS 文件。
document.write('<script type="text/javascript" src="https://res.wx.qq.com/open/js/jweixin-1.4.0.js"><\/script>');
} else if (/toutiaomicroapp/i.test(userAgent)) {
// 头条小程序 JS-SDK 如果不需要兼容头条小程序，则无需引用此 JS 文件。
document.write(
'<script type="text/javascript" src="https://s3.pstatp.com/toutiao/tmajssdk/jssdk-1.0.1.js"><\/script>');
} else if (/swan/i.test(userAgent)) {
// 百度小程序 JS-SDK 如果不需要兼容百度小程序，则无需引用此 JS 文件。
document.write(
'<script type="text/javascript" src="https://b.bdstatic.com/searchbox/icms/searchbox/js/swan-2.0.18.js"><\/script>'
);
} else if (/quickapp/i.test(userAgent)) {
// quickapp
document.write('<script type="text/javascript" src="https://quickapp/jssdk.webview.min.js"><\/script>');
}
</script>2、宿主tset.vue 需要在宿主APP或小程序嵌入webview页面，使用@message方法进行监听h5页面传递的数据（这里是个页面demo，注意不能再带有tab栏页面嵌入webview）
<template>
<view class="content">
<web-view src="https://xxx.com/xxdDev/#/" @message="getMessage" @onPostMessage="getMessage"></web-view>
</view>
</template>
<script>
export default {
data() {
return {
}
},
methods: {
getMessage(e) {
console.log(e,'监听到H5发送的数据')
}
}
}
</script>
<style>
</style>
3、index.htmlH5项目完整的在index.html引入代码（我这里把uni.webview.1.55.js放在了/static/js目录下）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<script>
var coverSupport = 'CSS' in window && typeof CSS.supports === 'function' && (CSS.supports('top: env(a)') ||
CSS.supports('top: constant(a)'))
document.write(
'<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0' +
(coverSupport ? ', viewport-fit=cover' : '') + '" />')
</script>
<title></title>
<!-- 引入微信小程序兼容文件，官网上还有其他平台的兼容文件，这里只用了微信小程序，所以就不判断环境了 -->
<script type="text/javascript">
var userAgent = navigator.userAgent;
if (userAgent.indexOf('AlipayClient') > -1) {
// 支付宝小程序的 JS-SDK 防止 404 需要动态加载，如果不需要兼容支付宝小程序，则无需引用此 JS 文件。
document.writeln('<script src="https://appx/web-view.min.js"' + '>' + '<' + '/' + 'script>');
} else if (/QQ/i.test(userAgent) && /miniProgram/i.test(userAgent)) {
// QQ 小程序
document.write(
'<script type="text/javascript" src="https://qqq.gtimg.cn/miniprogram/webview_jssdk/qqjssdk-1.0.0.js"><\/script>'
);
} else if (/miniProgram/i.test(userAgent) && /micromessenger/i.test(userAgent)) {
// 微信小程序 JS-SDK 如果不需要兼容微信小程序，则无需引用此 JS 文件。
document.write('<script type="text/javascript" src="https://res.wx.qq.com/open/js/jweixin-1.4.0.js"><\/script>');
} else if (/toutiaomicroapp/i.test(userAgent)) {
// 头条小程序 JS-SDK 如果不需要兼容头条小程序，则无需引用此 JS 文件。
document.write(
'<script type="text/javascript" src="https://s3.pstatp.com/toutiao/tmajssdk/jssdk-1.0.1.js"><\/script>');
} else if (/swan/i.test(userAgent)) {
// 百度小程序 JS-SDK 如果不需要兼容百度小程序，则无需引用此 JS 文件。
document.write(
'<script type="text/javascript" src="https://b.bdstatic.com/searchbox/icms/searchbox/js/swan-2.0.18.js"><\/script>'
);
} else if (/quickapp/i.test(userAgent)) {
// quickapp
document.write('<script type="text/javascript" src="https://quickapp/jssdk.webview.min.js"><\/script>');
}
</script>
<!-- 需要下载 uni.webview.1.5.5.js 并修改源码,前面笔者有提供修改文件 -->
<script>
var currentEnv = window.location.protocol;
var hostName = window.location.host;
var pathName = window.location.pathname
var isHttps = currentEnv === "https:";
var scriptSrc = currentEnv + "//" + hostName + pathName + '/static/js/uni.webview.1.5.5.js';
if (!isHttps) { //如果本地环境
scriptSrc = "./static/js/uni.webview.1.5.5.js"
}
var script = document.createElement('script');
script.type = 'module';
script.src = scriptSrc;
document.head.appendChild(script);
</script>
<body>
<div id="app"><!--app-html--></div>
<script type="module" src="/main.js"></script>
</body>
</html>4、h5test.vue 最后在H5单页面测试 给小程序或App发送消息（注意：给微信小程序发送消息必须使用jWeixin.miniProgram发送，给APP发送使用webUni）
<template>
<view>
<button @click="goWebView" type="warn">给App或微信小程序发送消息</button>
</view>
</template>
<script>
export default {
data() {
return {
}
},
methods: {
goWebView() {//这里一套代码 判断给微信小程序发送还是给App发送信息
if (typeof jWeixin !== 'undefined') {
jWeixin.miniProgram.getEnv(function(res) {
if (res) {
jWeixin.miniProgram.postMessage({
data: {
action: '我是H5页面给微信小程序发送的信息'
}
})
jWeixin.miniProgram.navigateBack({
delta: 1
})
}
});
} else {
webUni.postMessage({
data: {
action: '我是H5页面给APP发送的信息'
}
})
}
},
}
}
</script>
<style>
</style>打印效果：
注意：
1、uni.webview.js文件需要放在static/js/目录下，不然你得把index.html引入路径改成你所在目录。
2、在index.html文件我已经做了线上uni.webview.js文件路径判断，动态获取你所在目录。
