如何将数组转化为json字符串,然后转化回来

    var arr = ['111', '222', 333]
    console.log(arr)
    var obj = {}
    arr.forEach((v, i) => {
        obj[i] = v
    })
    console.log(obj)
    var str = JSON.stringify(obj)
    console.log(str)
    var obj2 = JSON.parse(str)
    var arr2 = [];
    for (const i in obj2) {
        arr2.push(obj2[i])
    }
    console.log(arr2)