【报Bug】此BUG严重，页面返回会触发页面的onLoad,导致数据重置，已经影响到第三方APP接入H5。

示例代码：

A页面

<template>  
    <view class="content">  
        <image class="logo" src="/static/logo.png"></image>  
        <br>  
        <button type="primary" size="mini" @click="gotopage">跳转到B</button>  
        <br>  
        <view>  
            <view class="title">{{title}}</view>  
        </view>  
    </view>  
</template>  

<script>  
    export default {  
        data() {  
            return {  
                title: 'Hello A',  
            }  
        },  
        onLoad() {  
            console.log('A page onLoad')  
            // this.getData()  
            uni.$on('pushFromB', this.setData)  
        },  
        onUnload() {  
            uni.$off('pushFromB')  
        },  
        onShow() {  
            console.log('A page onshow')  
        },  
        methods: {  
            setData(data) {  
                console.log('监听到事件来自 B ，携带参数 data 为：' + JSON.stringify(data));  
                this.title = data  
            },  

            gotopage() {  
                console.log('跳转到B')  
                uni.navigateTo({  
                    url: '/pages/b'  
                })  
            }  

        }  
    }  
</script>

B页面

<template>  
    <view class="content">  
        <image class="logo" src="/static/logo.png"></image>  
        <br>  
        <button type="primary" size="mini" @click="goto">跳转到C</button>  
        <br>  
    <button type="warn" size="mini" @click="pushData">返回A</button>  
        <view>  
            <text class="title">{{title}}</text>  
        </view>  
    </view>  
</template>  

<script>  
    export default {  
        data() {  
            return {  
                title: 'Hello B'  
            }  
        },  
        onLoad() {  
            console.log('B page onLoad')  
            uni.$on('pushFromC', this.setData)  
        },  
        onUnload() {  
            uni.$off('pushFromC')  
        },  
        onShow() {  
            console.log('B page onshow')  
        },  
        methods: {  
      goto() {  
                console.log('跳转到C')  
                uni.navigateTo({  
                    url: '/pages/c'  
                })  
            },  
            setData(data) {  
                console.log('监听到事件来自 C ，携带参数 data 为：' + JSON.stringify(data));  
                this.title = data  
            },  
      pushData() {  
                uni.$emit('pushFromB', 'Data from B')  
                this.back()  
            },  
            back(){  
                console.log('返回A')  
                uni.navigateBack({  
                    delta: 1  
                });  
            }  
        }  
    }  
</script>

C页面

<template>  
    <view class="content">  
        <image class="logo" src="/static/logo.png"></image>  
        <br>  
    <button type="warn" size="mini" @click="pushData">返回B</button>  
        <br>  
        <view>  
            <text class="title">{{title}}</text>  
        </view>  
    </view>  
</template>  

<script>  
    export default {  
        data() {  
            return {  
                title: 'Hello C'  
            }  
        },  
        onLoad() {  
      console.log('C page onload')  
        },  
        onShow() {  
            console.log('C page onshow')  
        },  
        methods: {          
            pushData() {  
        uni.$emit('pushFromC', 'Data from B')  
        this.back()  
            },  
            back(){  
                console.log('返回B')  
                uni.navigateBack({  
                    delta: 1  
                });  
            }  
        }  
    }  
</script>  

pages.json

{  
    "pages": [ //pages数组中第一项表示应用启动页，参考：https://uniapp.dcloud.io/collocation/pages  
        {  
            "path": "pages/a",  
            "style": {  
                "navigationBarTitleText": "A页面"  
            }  
        },  
        {  
            "path": "pages/b",  
            "style": {  
                "navigationBarTitleText": "B页面"  
            }  
        },  
        {  
            "path": "pages/c",  
            "style": {  
                "navigationBarTitleText": "C页面"  
            }  
        }  
    ],  
    "globalStyle": {  
        "navigationBarTextStyle": "black",  
        "navigationBarTitleText": "uni-app",  
        "navigationBarBackgroundColor": "#F8F8F8",  
        "backgroundColor": "#F8F8F8"  
    }  
}

操作步骤：

1. 页面有三个：A(启动页)， B，C；
2. 在chrome手机模式下选择Galaxy S Ⅲ调试；
3. A跳转到B，B返回A数据正常，但是从B跳转到C，再从C返回B就会触发B的onload，导致数据初始化了；

预期结果：

B跳转到C，C返回B数据正常

实际结果：

B跳转到C，C返回B触发了B的onload，导致数据初始化了