Question

我有这段代码，但它没有打印子键......

const replacements = {
    name: 'Bob',
    age: 37
}

interpolate('My name is ${name}, and I am ${age}.', replacements)

何时打印对象：someKey [Object object]

我的结果（例子）：

for (var key in result) { if (!result.hasOwnProperty(key)) continue; var obj = result[key]; for (var prop in obj) { if (!obj.hasOwnProperty(prop)) continue; alert(prop + " = " + obj[prop]); } }

Answer 1

如果将函数作为递归函数而不是嵌套的for in语句处理，那会更好，所以你只需要验证你的value是否一个对象再次调用该函数，所以在代码你有这个：

＆＃13;

var json = {
	"key1": "value1",
	"key2": "value2",
	"key3": {
  	"sub_1_key1": "subvalue1",
   	"sub_1_key2": "subvalue2",
   	"sub_1_key3": "subvalue3",
    "sub_1_key4": {
    	"sub_2_key1": "sub_2_value1"
    }
  },
};

var logger = document.getElementById('logs');

function goThroughJSON(json) {
	for (var attr in json) {
  	var value = json[attr];
  	if (typeof value === 'object' && !(attr instanceof Array)) {
    	return goThroughJSON(value);
    }
    logger.innerHTML += attr + '<br>'
  }
}

goThroughJSON(json);

＆＃13;

<div id="logs"></div>

＆＃13;

我真的希望你能帮到它。

Answer 2

您可以使用递归方法。对于任何键，如果它包含对象值，您可以再次再次调用相同的函数。

const data = [{ "branch_id": 992, "sale_id": 24422, "identifier": "", "emitter": { "id": 68, "tax_id": "", "address": { "street": "Carretera a buenavista km 21", "country_code": "MEX", } } } ];

const ObjectKey = o => {
  Object.keys(o).forEach(k => {
    if(typeof o[k] === 'object'){
      ObjectKey(o[k]);
    } else {
      console.log(k, " ", o[k]);
    }
  });
}

data.forEach(o => {
  ObjectKey(o);
});

Answer 3

我在这里找到了答案。

Get all keys of a deep object in Javascript

function getDeepKeys(obj) {
    var keys = [];
    for (var key in obj) {
        keys.push(key);
        if (typeof obj[key] === "object") {
            var subkeys = getDeepKeys(obj[key]);
            keys = keys.concat(subkeys.map(function (subkey) {
                return key + "." + subkey;
            }));
        }
    }
    return keys;
} 
var data = [{ "branch_id": 992, "sale_id": 24422, "identifier": "", "emitter": { "id": 68, "tax_id": "", "address": { "street": "Carretera a buenavista km 21", "country_code": "MEX", } } }];

console.log(getDeepKeys(data));

在JavaScript中获取Json的SubKeys

3 个答案: