arrays - Nodejs : How would I find a specific key value pair in a JSON object

Question

Nodejs 中是否有一种方法可以在对象中的任何位置查找特定的键:值对，如果存在则返回 true。

即。是否在以下对象中的任何位置找到了“DeviceType”:“无效设备类型”？

{
    "Config": {
        "Device": [{
            "DeviceType": 1,
            "Firmware": 216
        }],
        "Mobile": [{
            "DeviceType": "Invalid Device Type"
        }, {
            "DeviceType": "Invalid Device Type"
        }]
    }
}

Answer 1

有大量方法包括遍历对象，但除非您正在做比示例更复杂的事情，否则我建议您将对象转换为字符串并使用.indexOf方法来确定该字符串是否包含在对象字符串中:

var obj = {
    "Config": {
        "Device": [{
            "DeviceType": 1,
            "Firmware": 216
        }],
        "Mobile": [{
            "DeviceType": "Invalid Device Type"
        }, {
            "DeviceType": "Invalid Device Type"
        }]
    }
};

var objString = JSON.stringify(obj);
var childString = "\"DeviceType\":\"Invalid Device Type\"";
var isStringPresent = objString.indexOf(childString) >= 0;
console.log(isStringPresent); // true

childString = "\"DeviceType\":\"asdfasfd\"";
isStringPresent = objString.indexOf(childString) >= 0;
console.log(isStringPresent); // false

您还可以将逻辑封装到方法中:

function isStringContainedInObject(obj, str) {
    var objString = JSON.stringify(obj);
    return objString.indexOf(str) >= 0;
}

// invoke it
var obj = {
    "Config": {
        "Device": [{
            "DeviceType": 1,
            "Firmware": 216
        }],
        "Mobile": [{
            "DeviceType": "Invalid Device Type"
        }, {
            "DeviceType": "Invalid Device Type"
        }]
    }
};
var str = "\"DeviceType\":\"Invalid Device Type\"";
isStringContainedInObject(obj, str);