Wechat applet returns parameters or trigger events

Application scenarios

Click Select to jump to a new page , Select successfully on the new page and return to the previous page , Render the selected results to the previous page .

---

Problem description

Return to the previous page in wechat applet API yes wx.navigateBack , This with wx.navigateTo Somewhat different , The former does not url Provide return and carry parameters , The latter can be found in url Carry the parameters and jump . So how to return to the previous page with parameters ？

resolvent

Example ：A Parent page ,B Is a subpage ,B The page needs to return with parameters A page

A page

Page({
    
    data: {
    
      name:" Zhang San "
    },
	 
	test(){
    
		console.log("A page "); 
	}
})

B page

let pages = getCurrentPages();  //  Get the current page stack 

let prevPage = pages[pages.length - 2]; 

prevPage.setData({
        
	name: " Li Si " //  Value to be passed 
})

prevPage.test();  //  call  A Page method   Output ：A page 

wx.navigateBack({
    
    delta:1 // Return to the previous page 
})

result (A page )：

Page({
    
    data: {
    
      name:" Zhang San "
    },
	
	test(){
    
		console.log("A page "); 
	}
	
    onShow(){
    
	  console.log("this.data.name");  //  Li Si 
	}
})