动态访问对象属性（JS）[重复]

Question

我正在尝试使用字符串动态访问对象的属性。 例如： ".id.public" -> anyObject["id"]["public"]

问题 - 我不知道我有多少参数（例如“.id”或“.id.public”或“.id.public.whatever”。

我做了一些解决方法：

var currentSplit = anyObject;
var splitted = "id.public".split("\.");
splitted.forEach(function(s) { currentSplit = currentSplit[s]; });

当我现在尝试覆盖对象属性时，我将覆盖引用而不是对象属性。

currentSplit = "test";

我已经尝试过anyObject["id.public"] = "test"; 之类的东西，但没有奏效。

Answer 1

deep-get-set 库可以满足您的需求：

function get (obj, path) {
  var keys = path.split('.');
  for (var i = 0; i < keys.length; i++) {
    var key = keys[i];
    if (!obj || !hasOwnProperty.call(obj, key)) {
      obj = undefined;
      break;
    }
    obj = obj[key];
  }
  return obj;
}

function set (obj, path, value) {
  var keys = path.split('.');
  for (var i = 0; i < keys.length - 1; i++) {
    var key = keys[i];
    if (deep.p && !hasOwnProperty.call(obj, key)) obj[key] = {};
    obj = obj[key];
  }
  obj[keys[i]] = value;
  return value;
}

Answer 2

另一种设置值的方法

function setVal(obj, path, val){
    var paths = path.split('.'),
        curProp = obj;

    for(var i=0;i<paths.length-1;i++){
        curProp = curProp[paths[i]];
    }
    curProp[paths[i]] = val;

}

并像使用它

setVal(anyObj, "id.public", 'newValue');

Answer 3

如果没有这样的小代码，您将无法做到这一点：

 var mapToProperty = function(obj, path, value) {
        if (!path) return obj;

        var parts = path.split("."),
           p = parts[0],
           v = (typeof obj[p] === "function") ? obj[p](value) : (parts.length !==1 || !value) ? obj[p] : (obj[p] = value), value ;
           if (parts.length == 1) return v;
               return mapToProperty(v, parts.slice(1).join("."), value);
}

// use it like this

var myvalue = mapToProperty(myObj, "address.street")

// you can map into your objects as far as you want. obj1.obj2.obj3.prop

// you can set as well :-)

mapToProperty(myObj, "address.street", "This is great!")