uni-app中app和webview的h5通信简单步骤

安装： npm i y_uniwebview
引入： import y_uni from "y_uniwebview"

<template>
  <view class="avatar-uploader">
    <view>
      <button @click="postMessage">向app发送信息</button>
    </view>
    <view>
      接收到app信息：{{ appMsg }}
    </view>
  </view>
</template>
<script lang="ts" setup>

import y_uni from "y_uniwebview"
import { ref } from 'vue';

const appMsg = ref('');

// app信息触发方法
window.appCallBack = (val) => {
  appMsg.value = val
  console.log('app发送过来的数据---', val)
}

let count = 0;

// 向app发送信息
function postMessage(type) {
  console.log('h5发送信息');
  // 发送信息
  y_uni.webView.postMessage({
    data: {
      msg: `h5信息 ${count++} 次`
    }
  });
}

</script>

<template>
    <view>
        <button  @click="postMsg">
            向h5发送信息
        </button>
        <view>
            接收到h5信息：{{h5Msg}}
        </view>
    </view>
    <br>
    <web-view
            ref="sWebViewRef"
            src="http://192.168.31.93/" style="" :style="webViewStyle"
            @on-post-message="handleMessage"
    ></web-view>
</template>

<script setup>
    import {computed, ref} from 'vue';

    const sWebViewRef = ref()

    const h5Msg = ref('');

    // 接收h5信息
    function handleMessage(event) {
        // 接收webview发送的消息
        h5Msg.value = event.detail.data[0].msg;
        console.log('收到 h5 消息: ' + h5Msg);
    }
    
    let count = 0;

    // 向 h5 发送信息
    function postMsg(msg) {
        console.log('app发送信息')
        sWebViewRef.value.evalJS(`appCallBack('app信息 ${count++} 次')`)
    }

    const webViewStyle = computed(() => {
        let width = 0;
        let height = 0;
        uni.getSystemInfo({
            // 获取当前设备的具体信息
            success: sysinfo => {
                width = sysinfo.windowWidth - 100;
                height = sysinfo.windowHeight - 100;
            }
        })
        return {
            width: width + 'px', height: height + 'px'
        }
    })
</script>