遍历JavaScript对象的最佳实践[重复]

Question

我有以下JavaScript对象，我需要将parseFloat应用到任何数字值字段（以便ngTable正确排序）。

我的对象：

{
    "data": [
        {
            "Person": {
                "id" : "1",
                "age": "23",
                "days": "5",
                "first_name": "Joe",
                "last_name": "Smith",
            },
            "PersonDetails": {
                "id": "4",
                "name": "Cousin",
                "oldest: "2",
            }
        },
        {
            "Person": {
                "id" : "2",
                "age": "18",
                "days": "3",
                "first_name": "John",
                "last_name": "Doe",
            },
            "PersonDetails": {
                "id": "4",
                "name": "Second Cousin",
                "oldest: "3",
            }
        }
        ...
        ...
    ]
};

Answer 1

您可以这样做一个测试：

function representsNumber(str) {
    return str === (+str).toString();
}

// E.g. usage
representsNumber('a'); // false
representsNumber([]); // false
representsNumber(1); // false (it IS a number)
representsNumber('1.5'); // true
representsNumber('-5.1'); // true
representsNumber('NaN'); // true

并在所有节点上递归。矫枉过正的例子：

function seeker(o, test, _true, _false) {
    _true || (_true = function (e) {return e;});
    _false || (_false = function (e) {return e;});
    function recursor(o) {
        var k;
        if (o instanceof Array)
            for (k = 0; k < o.length; ++k) // Iterate over an array
                if (typeof o[k] !== 'object')
                    o[k] = test(o[k]) ? _true(o[k]) : _false(o[k]);
                else
                    recursor(o[k]);
        else
            for (k in o) // Iterate over an object
                if (typeof o[k] !== 'object')
                    o[k] = test(o[k]) ? _true(o[k]) : _false(o[k]);
                else
                    recursor(o[k]);
    }
    if (typeof o === "object") 
        return recursor(o), o;
    else 
        return test(o) ? _true(o) : _false(o); // Not an object, just transform
}

// Sample usage
seeker({foo: [{bar: "20"}]}, representsNumber, parseFloat);
// {foo: [{bar: 20}]}