一位数组变成json格式？

    let arr = ["1.1","1.2","1.3","2.1","2.1","2.3"];    let arr1 = [];    let arr2 = [];    for(let i=0;i<arr.length;i++){      console.log(arr1.indexOf(arr[i]))            if(arr1.indexOf(arr[i])>-1){        arr2[arr1.indexOf(arr[i])].push(arr[i])      }else{        let newArr = []        newArr.push(arr[i])        arr1.push(arr[i])        arr2.push(newArr)      }    }    console.log(arr2)

let arr1 = ["1.1","1.2","1.3","2.1","2.2","2.3"];let arr2 = arr1.map(m => {      return {0:m};    })console.log(arr2)

let arr = ["1.1","1.2","1.3","2.1","2.2","2.3"];let newArr = [];for(let i=0;i<arr.length;i++){    newArr.push({        "0":arr[i]    })}console.log(newArr)