Question

我试图用字符串动态访问对象的属性。例如：＆＃34; .id.public＆＃34; - ＆GT; anyObject [＆＃34; ID＆＃34;] [＆＃34;公共＆＃34;]

问题 - 我不知道我有多少论点（例如＆＃34; .id＆＃34;或＆＃34; .id.public＆＃34;或＆＃34; .id。 public.whatever＆＃34;

我做了一点解决方法：

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";

我已尝试过类似anyObject["id.public"] = "test";的内容，但它没有用。

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

另一种设定价值的方法

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

一样使用它

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

Answer 3

如果没有像这样的小代码的帮助，你就无法做到这一点：

 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!")

动态访问对象属性（JS）

3 个答案: