【报Bug】$on 接收其他页面通讯值成功 但是无法更新渲染

接收成功说明就不是$on的问题了，把你代码精简一下发上来我们验证一下

页面1代码如下
<template>
<view class="content">
<image class="logo" src="/static/logo.png"></image>
<view class="text-area">
<text class="title" @click="nav_to">{{title}}</text>
</view>
</view>
</template>

<script>
export default {
data() {
return {
title: 'Hello'
}
},
onLoad() {

    },  
    methods: {  
      nav_to(){  
          uni.$emit("tiaozhuan",{"msg":"xxxxxxxxxxxx"});  
          uni.navigateTo({  
            url:"../nav/nav",  
          })  
      }  
    }  
}  

</script>

<style>
.content {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}

.logo {  
    height: 200rpx;  
    width: 200rpx;  
    margin-top: 200rpx;  
    margin-left: auto;  
    margin-right: auto;  
    margin-bottom: 50rpx;  
}  

.text-area {  
    display: flex;  
    justify-content: center;  
}  

.title {  
    font-size: 36rpx;  
    color: #8f8f94;  
}  

</style>

页面2 代码如下
<template>
<view>
<view>{{msg1}}</view>
</view>
</template>

<script>
export default {
data() {
return {
msg1:"1",
}
},
onLoad() {
let me=this;
uni.$once("tiaozhuan",function(data){
me.msg1=data.msg;
console.log(me.msg1);
console.log(data.msg);

        })  
    },  
    methods: {  

    }  
}  

</script>

<style>

</style>

<template>  
    <view class="content">  
        <image class="logo" src="/static/logo.png"></image>  
        <view class="text-area">  
            <text class="title"  @click="nav_to">{{title}}</text>  
        </view>  
    </view>  
</template>  

<script>  
    export default {  
        data() {  
            return {  
                title: 'Hello'  
            }  
        },  
        onLoad() {  

        },  
        methods: {  
          nav_to(){  
              uni.$emit("tiaozhuan",{"msg":"xxxxxxxxxxxx"});  
              uni.navigateTo({  
                url:"../nav/nav",  
              })  
          }  
        }  
    }  
</script>  

<style>  
    .content {  
        display: flex;  
        flex-direction: column;  
        align-items: center;  
        justify-content: center;  
    }  

    .logo {  
        height: 200rpx;  
        width: 200rpx;  
        margin-top: 200rpx;  
        margin-left: auto;  
        margin-right: auto;  
        margin-bottom: 50rpx;  
    }  

    .text-area {  
        display: flex;  
        justify-content: center;  
    }  

    .title {  
        font-size: 36rpx;  
        color: #8f8f94;  
    }  
</style>  

页面2

<template>  
    <view>  
        <view>{{msg1}}</view>  
    </view>  
</template>  

<script>  
    export default {  
        data() {  
            return {  
                msg1:"1",  
            }  
        },  
        onLoad() {  
            let me=this;  
            uni.$once("tiaozhuan",function(data){  
                me.msg1=data.msg;  
                console.log(me.msg1);  
                console.log(data.msg);  

            })  
        },  
        methods: {  

        }  
    }  
</script>  

<style>  

</style>  

遇到同样的问题.
A页面:

uni.navigateTo({  
 url: `/pages/product/list?category=${item.ID}`  
});  
uni.$emit('pushCategories', this.subCategories);

B页面

onLoad(options) {  

            uni.$once('pushCategories', this.initCategories);  
        },  
methods: {  
  initCategories(data) {  
                console.log(data); // 第一次就不会打印,返回上一页,再次导航此页面才打印  
                this.cateList = data; // 赋值以后,页面不会更新渲染  
            },  
}

为什么你们都是先发送再监听的？是在哪看到的这种写法？