我已经看了所有其他的答案，决定在更可读的代码中添加改进:

function getObjectValByString(obj, str) {
if (typeof obj === "string") return obj;

const fields = str.split(".");

return getObjectValByString(obj[fields[0]], fields.slice(1).join("."));}

下面是一个代码片段:

let someObject = { 合作伙伴:{ id:“目标”, 人:{ 名称:“蚂蚁”, an:{名称:“ESM”}， }， }， }; 函数getObjectValByString(obj, str) { If (typeof obj === "string")返回obj; Const fields = str.split("."); 返回getObjectValByString(obj[fields[0]]， fields.slice(1).join(".")); ｝ const result = getObjectValByString(someObject， "partner.person.an.name"); console.log ({ 结果, })；

也适用于对象内的数组/数组。 防御无效值。

/** * Retrieve nested item from object/array * @param {Object|Array} obj * @param {String} path dot separated * @param {*} def default value ( if result undefined ) * @returns {*} */ function path(obj, path, def){ var i, len; for(i = 0,path = path.split('.'), len = path.length; i < len; i++){ if(!obj || typeof obj !== 'object') return def; obj = obj[path[i]]; } if(obj === undefined) return def; return obj; } ////////////////////////// // TEST // ////////////////////////// var arr = [true, {'sp ace': true}, true] var obj = { 'sp ace': true, arr: arr, nested: {'dotted.str.ing': true}, arr3: arr } shouldThrow(`path(obj, "arr.0")`); shouldBeDefined(`path(obj, "arr[0]")`); shouldBeEqualToNumber(`path(obj, "arr.length")`, 3); shouldBeTrue(`path(obj, "sp ace")`); shouldBeEqualToString(`path(obj, "none.existed.prop", "fallback")`, "fallback"); shouldBeTrue(`path(obj, "nested['dotted.str.ing'])`); <script src="https://cdn.rawgit.com/coderek/e7b30bac7634a50ad8fd/raw/174b6634c8f57aa8aac0716c5b7b2a7098e03584/js-test.js"></script>

基于前面的回答，我创建了一个也可以处理括号的函数。但由于裂开，里面没有点。

function get(obj, str) {
  return str.split(/\.|\[/g).map(function(crumb) {
    return crumb.replace(/\]$/, '').trim().replace(/^(["'])((?:(?!\1)[^\\]|\\.)*?)\1$/, (match, quote, str) => str.replace(/\\(\\)?/g, "$1"));
  }).reduce(function(obj, prop) {
    return obj ? obj[prop] : undefined;
  }, obj);
}

DotObject = obj => new Proxy(obj， { Get:函数(o,k) { Const m = k.match(/(.+?)\.(.+)/) 返回m ?这一点。Get (o[m[1]]， m[2]): o[k] ｝ }) const test = DotObject({a: {b: {c: 'wow'}}}) console.log(测试[' a.b.c '])

我正在用React开发网上商店。我尝试在复制的状态对象中更改值，以在提交时更新原始状态。 上面的例子没有为我工作，因为他们中的大多数突变复制对象的结构。我找到了访问和更改深嵌套对象属性值的函数的工作示例:https://lowrey.me/create-an-object-by-path-in-javascript-2/

const createPath = (obj, path, value = null) => {
  path = typeof path === 'string' ? path.split('.') : path;
  let current = obj;
  while (path.length > 1) {
    const [head, ...tail] = path;
    path = tail;
    if (current[head] === undefined) {
      current[head] = {};
    }
    current = current[head];
  }
  current[path[0]] = value;
  return obj;
};

/**
 * Access a deep value inside a object 
 * Works by passing a path like "foo.bar", also works with nested arrays like "foo[0][1].baz"
 * @author Victor B. https://gist.github.com/victornpb/4c7882c1b9d36292308e
 * Unit tests: http://jsfiddle.net/Victornpb/0u1qygrh/
 */
function getDeepVal(obj, path) {
    if (typeof obj === "undefined" || obj === null) return;
    path = path.split(/[\.\[\]\"\']{1,2}/);
    for (var i = 0, l = path.length; i < l; i++) {
        if (path[i] === "") continue;
        obj = obj[path[i]];
        if (typeof obj === "undefined" || obj === null) return;
    }
    return obj;
}

适用于

getDeepVal(obj,'foo.bar')
getDeepVal(obj,'foo.1.bar')
getDeepVal(obj,'foo[0].baz')
getDeepVal(obj,'foo[1][2]')
getDeepVal(obj,"foo['bar'].baz")
getDeepVal(obj,"foo['bar']['baz']")
getDeepVal(obj,"foo.bar.0.baz[1]['2']['w'].aaa[\"f\"].bb")