book-hi/packet/components/root-back-home.vue

<template>
	<view class="root-back-home"></view>
</template>

<script>
	// 不带 path 的再次进入（聊天下拉、最近使用等）会停在上次的红包页。
	// 页面栈只有这一页时，返回会直接退出小程序。先打开首页再回到当前页，返回就能进首页。
	const REOPEN_SCENES = [1001, 1089, 1090, 1103, 1104, 1106]
	const HOME_URL = '/pages/sell/index'
	let padding = false

	function getEntryScene() {
		try {
			if (typeof uni.getEnterOptionsSync === 'function') {
				const scene = uni.getEnterOptionsSync().scene
				if (scene) return Number(scene)
			}
		} catch (e) {}
		try {
			const app = getApp()
			return Number(app && app.globalData && app.globalData.entryScene) || 0
		} catch (e) {
			return 0
		}
	}

	export default {
		methods: {
			sync() {
				if (padding) return true
				const pages = getCurrentPages()
				if (pages.length !== 1) return false
				if (!REOPEN_SCENES.includes(getEntryScene())) return false

				const page = pages[0]
				const route = page.route || ''
				if (route.indexOf('packet/pages/') !== 0) return false

				const query = {}
				const pageOptions = page.options || {}
				if (pageOptions.bianhao) query.bianhao = pageOptions.bianhao
				const bianhao = this.$parent && this.$parent.bianhao
				if (bianhao && !query.bianhao) query.bianhao = bianhao
				const qs = Object.keys(query)
					.map((key) => key + '=' + encodeURIComponent(query[key]))
					.join('&')
				const url = '/' + route + (qs ? '?' + qs : '')

				padding = true
				const openPacket = (retry) => {
					uni.navigateTo({
						url,
						success: () => {
							padding = false
						},
						fail: () => {
							if (retry) {
								setTimeout(() => openPacket(false), 200)
								return
							}
							padding = false
						}
					})
				}
				uni.switchTab({
					url: HOME_URL,
					success: () => {
						// 等首页切换完成再打开红包页，避免路由冲突
						setTimeout(() => openPacket(true), 50)
					},
					fail: () => {
						padding = false
					}
				})
				return true
			}
		}
	}
</script>

<style lang="scss" scoped>
	.root-back-home {
		height: 0;
		width: 0;
		overflow: hidden;
	}
</style>