Applet processed before navigateTo return many times to jump to get the same data page

// execute onShow in 
const pages = getCurrentPages (); // get all the pages stack 
const currPage = pages [pages.length - 1 ]; // current page 
// determine whether the current page has data storage, any use, no memory 
IF (! currPage.data.Id == undefined) { 
  this.id = currPage.data.Id || this.id; 
} the else { 
  currPage.setData ({ 
    Id: this.id 
  }); 
}