javascript - 为搜索到的键/值对返回 bool 值的最简单方法 (Javascript)

Question

我有以下 JSON 字符串...

JSON:

[{"my_id":"100002","my_confirmation":"682354682"},{"my_id":"100005","my_confirmation":"281735345"},{"my_id":"100009","my_confirmation":"361567356"}]

... 然后我将其解析为键/值对数组。

如果尝试匹配“100005”的“my_id”，通过 Javascript 返回 bool 值的最简单方法是什么？还有，是否需要解析成数组？

Answer 1

如果您已经在解析 JSON 字符串，那么在 ECMA5 中您可以使用 Array.prototype.some

Javascript

var jsonString = '[{"my_id":"100002","my_confirmation":"682354682"},{"my_id":"100005","my_confirmation":"281735345"},{"my_id":"100009","my_confirmation":"361567356"}]';

var matches = JSON.parse(jsonString).some(function (obj) {
    return obj.my_id === '100005';
});

console.log(matches);

输出

true

On jsFiddle

or you could go even more funky like this

function myContains(jsonStr, key, value) {
    return JSON.parse(jsonStr).some(function (obj) {
        return obj[key] === value;
    });
}

var jsonString = '[{"my_id":"100002","my_confirmation":"682354682"},{"my_id":"100005","my_confirmation":"281735345"},{"my_id":"100009","my_confirmation":"361567356"}]';

console.log(myContains(jsonString, 'my_id', '100005'));