// (IE9+) Two steps var pathString = "[0]['property'].others[3].next['final']"; var obj = [{ property: { others: [1, 2, 3, { next: { final: "SUCCESS" } }] } }]; // Turn string to path array var pathArray = pathString .replace(/\[["']?([\w]+)["']?\]/g,".$1") .split(".") .splice(1); // Add object prototype method Object.prototype.path = function (path) { try { return [this].concat(path).reduce(function (f, l) { return f[l]; }); } catch (e) { console.error(e); } }; // usage console.log(obj.path(pathArray)); console.log(obj.path([0,"doesNotExist"]));

现在lodash使用_支持这一点。get (obj,财产)。看到https://lodash.com/docs

文档中的例子:

var object = { 'a': [{ 'b': { 'c': 3 } }] };

_.get(object, 'a[0].b.c');
// → 3

_.get(object, ['a', '0', 'b', 'c']);
// → 3

_.get(object, 'a.b.c', 'default');
// → 'default'

根据Alnitak的回答:

if(!Object.prototype.byString){
  //NEW byString which can update values
Object.prototype.byString = function(s, v, o) {
  var _o = o || this;
      s = s.replace(/\[(\w+)\]/g, '.$1'); // CONVERT INDEXES TO PROPERTIES
      s = s.replace(/^\./, ''); // STRIP A LEADING DOT
      var a = s.split('.'); //ARRAY OF STRINGS SPLIT BY '.'
      for (var i = 0; i < a.length; ++i) {//LOOP OVER ARRAY OF STRINGS
          var k = a[i];
          if (k in _o) {//LOOP THROUGH OBJECT KEYS
              if(_o.hasOwnProperty(k)){//USE ONLY KEYS WE CREATED
                if(v !== undefined){//IF WE HAVE A NEW VALUE PARAM
                  if(i === a.length -1){//IF IT'S THE LAST IN THE ARRAY
                    _o[k] = v;
                  }
                }
                _o = _o[k];//NO NEW VALUE SO JUST RETURN THE CURRENT VALUE
              }
          } else {
              return;
          }
      }
      return _o;
  };

}

这也允许你设置一个值!

我已经用这个创建了一个npm包和github

mohamed Hamouday' Answer的扩展将填补缺失的关键

function Object_Manager(obj, Path, value, Action, strict) 
{
    try
    {
        if(Array.isArray(Path) == false)
        {
            Path = [Path];
        }

        let level = 0;
        var Return_Value;
        Path.reduce((a, b)=>{
            console.log(level,':',a, '|||',b)
            if (!strict){
              if (!(b in a)) a[b] = {}
            }


            level++;
            if (level === Path.length)
            {
                if(Action === 'Set')
                {
                    a[b] = value;
                    return value;
                }
                else if(Action === 'Get')
                {
                    Return_Value = a[b];
                }
                else if(Action === 'Unset')
                {
                    delete a[b];
                }
            } 
            else 
            {
                return a[b];
            }
        }, obj);
        return Return_Value;
    }

    catch(err)
    {
        console.error(err);
        return obj;
    }
}

例子

obja = {
  "a": {
    "b":"nom"
  }
}

// Set
path = "c.b" // Path does not exist
Object_Manager(obja,path.split('.'), 'test_new_val', 'Set', false);

// Expected Output: Object { a: Object { b: "nom" }, c: Object { b: "test_new_value" } }

我认为你的要求是:

var part1name = someObject.part1.name;
var part2quantity = someObject.part2.qty;
var part3name1 =  someObject.part3[0].name;

你可以这样问:

var part1name = someObject["part1"]["name"];
var part2quantity = someObject["part2"]["qty"];
var part3name1 =  someObject["part3"][0]["name"];

这两种方法都可行

也许这是你自找的

var partName = "part1";
var nameStr = "name";

var part1name = someObject[partName][nameStr];

终于轮到你自找麻烦了

var partName = "part1.name";

var partBits = partName.split(".");

var part1name = someObject[partBits[0]][partBits[1]];

简单的函数，允许字符串或数组路径。

function get(obj, path) {
  if(typeof path === 'string') path = path.split('.');

  if(path.length === 0) return obj;
  return get(obj[path[0]], path.slice(1));
}

const obj = {a: {b: {c: 'foo'}}};

console.log(get(obj, 'a.b.c')); //foo

OR

console.log(get(obj, ['a', 'b', 'c'])); //foo