The problem of converting a specific format string to json format in JS

A string is as follows:
Table name 1 @ Field 1 ~ Table name 1 @ Field 2 ~ Table name 2 @ Field 1 ~ Table name 2 @ Field 2

how to reasonably handle it in json format 

 {
     1:[12],
     2:[1, 2]
 }
Javascript java
Mar.04,2021 
var str = '1@1~1@2~2@1~2@2'

var obj = str.split('~').reduce((state, item) => {
  var [tname, fname] = item.split('@')
  if (state[tname]) {
    state[tname].push(fname)
  } else {
    state[tname] = [fname]
  }
  return state
}, {})

that's about it 

var str='1@1~1@2~2@1~2@2'
var arr=str.split("~")
var obj={}
for(var i=0;i<arr.length;iPP){ 
  var temp=arr[i].split("@")
  var key=temp[0]
  var value=temp[1]
  obj[key]=(obj[key]||[]).concat([value])
}
console.log(JSON.stringify(obj))

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