如何在对象中设置值

Question

我必须在对象中设置值。这就是问题所在：当我尝试在具有一些道具的对象中编写道具时，以前的道具将被删除。我解决了两个案例，还有最后一个。我需要保存 test2。我该如何解决？谢谢。var obj = {  keyOne: "foo",  keyTwo: {    test1: "baz",    test2: {      test21: ["bar"],    }  }}function setObjectProperty(obj, string, value) {  var path = string.split('.');  var currentObj = obj;  for (var i = 0; i < path.length - 1; i++) {    if (!currentObj[path[i]] || currentObj[path[i]] != "string") {      currentObj[path[i]] = {};      currentObj = currentObj[path[i]];    }  }  currentObj[path[path.length - 1]] = value;};setObjectProperty(obj, 'keyOne', 'new');setObjectProperty(obj, 'keyOne.key.key2', 'newnew');setObjectProperty(obj, 'keyTwo.test1', 'zzz');console.log(obj);

Answer 1

很少进行更正。

无论创建子对象，您都需要推进对象路径

要检查字符串类型，您需要使用typeof

var obj = {

  keyOne: "foo",

  keyTwo: {

    test1: "baz",

    test2: {

      test21: ["bar"],

    }

  }

}

function setObjectProperty(obj, string, value) {

  var path = string.split('.');

  var currentObj = obj;

  

  for (var i = 0; i < path.length - 1; i++) {

    if (!currentObj[path[i]] || typeof currentObj[path[i]] === 'string') {

      currentObj[path[i]] = {};     

    }

    

     currentObj = currentObj[path[i]];

  }

  currentObj[path[path.length - 1]] = value;

};

setObjectProperty(obj, 'keyOne', 'new');

setObjectProperty(obj, 'keyOne.key.key2', 'newnew');

setObjectProperty(obj, 'keyTwo.test1', 'zzz');

console.log(obj);

Answer 2

这个测试currentObj[path[i]] != "string"看起来很奇怪，我想你想用它typeof来代替。

在循环内部，您应该在每一步都前进，但仅在对象不存在时才创建它。

工作代码：

function setObjectProperty(obj, string, value) {

  var path = string.split('.');

  var currentObj = obj;

  for (var i = 0; i < path.length - 1; i++) {

    if (!currentObj[path[i]] || typeof currentObj[path[i]] == "string") {

      currentObj[path[i]] = {};

    }

    currentObj = currentObj[path[i]];

  }

  currentObj[path[path.length - 1]] = value;

};

Answer 3

这是你想要的？

const store = {

  keyOne: "foo",

  keyTwo: {

    test1: "baz",

    test2: {

      test21: ["bar"],

    }

  }

}

function getKeys(key) {

  return key.split(".").filter(k => k.length);

}

function assignProps(object, keys, value = null, root = null) {

  root = root || object;

  

  const key = keys.shift();

  if (!key) return root;

  object[key] = keys.length === 0 ? value : {};

  assignProps(object[key], keys, value, root);

}

assignProps(store, getKeys("keyOne.foo.bar"), "baz");

assignProps(store, getKeys("keyTwo.test1.test2"), "value");

console.log(store);