编辑代码

//JSRUN引擎2.0，支持多达30种语言在线运行，全仿真在线交互输入输出。 
console.log("Hello JSRUN!   \n\n         - from NodeJS .");

JSON.unflatten = function(data) {
    "use strict";
    if (Object(data) !== data || Array.isArray(data))
        return data;
    var result = {}, cur, prop, idx, last, temp;
    for(var p in data) {
        cur = result, prop = "", last = 0;
        do {
            idx = p.indexOf(".", last);
            temp = p.substring(last, idx !== -1 ? idx : undefined);
            cur = cur[prop] || (cur[prop] = (!isNaN(parseInt(temp)) ? [] : {}));
            prop = temp;
            last = idx + 1;
        } while(idx >= 0);
        cur[prop] = data[p];
    }
    return result[""];
}
JSON.flatten = function(data) {
    var result = {};
    function recurse (cur, prop) {
        if (Object(cur) !== cur) {
            result[prop] = cur;
        } else if (Array.isArray(cur)) {
             for(var i=0, l=cur.length; i<l; i++)
                 recurse(cur[i], prop ? prop+"."+i : ""+i);
            if (l == 0)
                result[prop] = [];
        } else {
            var isEmpty = true;
            for (var p in cur) {
                isEmpty = false;
                recurse(cur[p], prop ? prop+"."+p : p);
            }
            if (isEmpty)
                result[prop] = {};
        }
    }
    recurse(data, "");
    return result;
}

var log = function(data){
    console.log(JSON.stringify(data));
}
let s1 = JSON.flatten({foo:{bar:false}});
log(s1);
log(JSON.unflatten(s1));

let s2 = JSON.flatten({a:[{b:["c","d"]}]});
log(s2);
log(JSON.unflatten(s2));

let s3 = JSON.flatten([1,[2,[3,4],5],6]);
log(s3);
log(JSON.unflatten(s3));

let s4 = JSON.flatten({x:{t:new Date(),N:1,s:"name",b:true}});
log(s4);
log(JSON.unflatten(s4));