您可以尝试使用array.some()：

let checkKeyPresenceInArray = key => arrOfObj.some(obj => Object.keys(obj).includes(key));

let arrOfObj = [{
        "mainKey1": {
            "subKey1": {
                "innerKey1": {
                    "innerMostKey1": {
                        "key1": "value"
                    }
                }
            }
        }
    }, {
        "mainKey2": {
            "key2": "value"
        }
    }, {
        "mainKey3": {
            "subKey3": {
                "key3": "value"
            }
        }
    }
]

let checkKeyPresenceInArray = key => arrOfObj.some(obj => Object.keys(obj).includes(key));


var isKeyPresent = checkKeyPresenceInArray('mainKey3')

console.log(isKeyPresent);

你可以遍历数组，检查是否有对象有你要找的键，如果有就返回true。如果没有找到键，for循环就会结束，返回false。

arrOfObj = [{
        "mainKey1": {
            "subKey1": {
                "innerKey1": {
                    "innerMostKey1": {
                        "key1": "value"
                    }
                }
            }
        }
    }, {
        "mainKey2": {
            "key2": "value"
        }
    }, {
        "mainKey3": {
            "subKey3": {
                "key3": "value"
            }
        }
    }
]

function arrayHasKey(arr, key) {
  for (const obj of arr) {
    if (key in obj) { return true; }
  }
  return false;
}

console.log(arrayHasKey(arrOfObj, "mainKey2"))
console.log(arrayHasKey(arrOfObj, "mainKey10"))

这将工作，它返回布尔值：

arrOfObj.hasOwnProperty('mainKey3');

您可以将some与hasOwnProperty搭配使用，如下所示：

let checkKeyPresenceInArray = (key) => arrOfObj.some((o) => o.hasOwnProperty(key));

您必须使用**hasOwnProperty**方法来检查该数组中的对象中是否存在该键-

var c = 0;
arrOfObj.forEach(e => {
  if(e.hasOwnProperty("mainKey1")){
       c++;
   }
});
if(c > 0 && c == arrOfObj.length){
    console.log("The key is found in all the objects in the array.");
}
else if(c == 0){
    console.log("The key is not found in any objects in the array");
}
else{
     console.log("The key is  found in some objects in the array");
}

为此，可以应用JSON.stringify()：

let list = [{
        "data1": {
            "subKey1": {
                "innerKey1": {
                    "innerMostKey1": {
                        "key1": "value"
                    }
                }
            }
        }
    }, {
        "data2": {
            "key2": "value"
        }
    }, {
        "data3": {
            "subKey3": {
                "key3": "value"
            }
        }
    }
]

let checkIfInArray = key => list.some(obj => JSON.stringify(obj).indexOf(key) > -1);

var result = checkIfInArray('key2')

alert(result);