检查 JSON 中的重复项

Question

我有一个 json 对象：

 var object1 =  [{
        "value1": "1",
        "value2": "2",
        "value3": "3",
    },
    {
        "value1": "1",
        "value2": "5",
        "value3": "7",
    },
    {
        "value1": "6",
        "value2": "9",
        "value3": "5",
    },
    {
        "value1": "6",
        "value2": "9",
        "value3": "5",
    }]

现在我想从该对象中取出每条记录，并检查该记录的精确副本在该对象中出现了多少次。如果只有 1 个副本，则执行某些操作；如果超过 2 个，则执行其他操作。

关于 JSON 重复项的答案很少，但它们针对的是特定值而不是完整记录。

那我记录一下：

   {
        "value1": "1",
        "value2": "2",
        "value3": "3",
    }

并将其与对象进行比较。上面的记录将 return 1 因为对象内部只有 1 个副本

供将来使用。完整的答案是：

var asset = [
    { value1: "1", value2: "2", value3: "3" },
    { value1: "1", value2: "5", value3: "7" },
    { value1: "6", value2: "9", value3: "5" },
    { value1: "6", value2: "9", value3: "5" }
];

function countEqual(oo, pp) {
    var count = 0;
    oo.forEach(function (el) {
        var i, equal = true;
        for (i in el) {
            equal = equal && el[i] === pp[i];
        }
        equal && count++;
    });
    return count;
}

        var cleaned = [];

        asset.forEach(function (itm) {
            var unique = true;
            cleaned.forEach(function (itm2) {
                if (_.isEqual(itm, itm2)) unique = false;
            });
            if (unique) cleaned.push(itm);
        });

        for (var i = 0; i < cleaned.length; i++)
        {
            if(countEqual(asset, cleaned[i]) === 1)
               {
                   // DO SOMETHING
               }
            else
               {
                  // DO SOMETHING ELSE
               }
        }

Answer 1

如果您要查找的是一个计算数组中某个对象出现次数的函数，则以下代码应该对您有所帮助（这假设您的对象中的属性始终遵循相同的顺序。如果您不确定，您应该使用适当的相等性检查功能）：

var nbOcc = function (needle, haystack) {
  return haystack.filter(function (record) {
    return JSON.stringify(needle) === JSON.stringify(record);
  }).length;
};

console.log(nbOcc({
  "value1": "1",
  "value2": "2",
  "value3": "3",
}, object1)); // 1

console.log(nbOcc({
  "value1": "6",
  "value2": "9",
  "value3": "5",
}, object1)); // 2

JSFiddle link

Answer 2

var asset = [
    { value1: "1", value2: "2", value3: "3" },
    { value1: "1", value2: "5", value3: "7" },
    { value1: "6", value2: "9", value3: "5" },
    { value1: "6", value2: "9", value3: "5" }
];

function countEqual(oo, pp) {
    var count = 0;
    oo.forEach(function (el) {
        var i, equal = true;
        for (i in el) {
            equal = equal && el[i] === pp[i];
        }
        equal && count++;
    });
    return count;
}
console.log(countEqual(asset, { value1: "1", value2: "1", value3: "2" })); // 0
console.log(countEqual(asset, { value1: "1", value2: "2", value3: "3" })); // 1
console.log(countEqual(asset, { value1: "6", value2: "9", value3: "5" })); // 2

检查 JSON 中的重复项

Check for duplicates in JSON

javascript

jquery

json

duplicates