uniapp develops a small program. When the second-level page returns to the first-level page, an event on the first-level page is triggered or a certain data on the first-level page is updated.

Secondary page code:

uni.navigateBack({
			delta: 1,
			success() {
				const pages = getCurrentPages();
				const targetPage = pages[0];
				targetPage.$vm.addJournalState=true
	}
})

Some bloggers get the information on the previous page through this way: var targetPage = pages[pages.length - 2], I get it like this and it shows undefined, you can print the ages, look at the content, and then choose by yourself

annotation:

getCurrentPages()method to get the current page stack

$vmRefers to the Vue component instance

First level page code:

		onShow() {
			setTimeout(() => {
				if (this.addJournalState) {
                    // 重新获取数据
					this.upJournal()
					this.addJournalState = false
				}
			}, 100)
		}

Every time the page is switched, it will be judged. If the specified secondary page returns, the status will be set to true, and the code will be executed to retrieve the data. Others will not

annotation:

The reason for using setTimeout is to confirm that the state of the first-level page addJournalState has been modified