gistfile1.txt

let data = {}
let items = {}
let env = {}

let DATA_KEY = "__APP_DATA:0.0.1__"

function init(){
  data.x ??= 0
  data.y ??= 0
}

function save(){
  data.__items = {}
  for(let k in items){
    let x = items[k].save()
    data.__items[k] = x
  }
  let x = JSON.stringify(data)
  localStorage.setItem(DATA_KEY, x)
}
function load(){
  try{
    let x = JSON.parse(localStorage.getItem(DATA_KEY))
    data = x
    for(let k in data.__items
  }catch(e){
    console.error(e)
    console.error('load error')
  }
}

function main(){

}

function page1(data){
  
}

function draw(){
}