从JavaScript中的嵌套JSON对象获取键的值
假设我们有一个嵌套的JSON对象,如下所示:
const obj = { "prop": [ { "key": "FOO", "value": "Foo is wonderfull, foo is great" }, { "key": "BAR", "value": "Bar is bad, really bad" } ] };
我们需要编写一个JavaScript函数,该函数将一个这样的对象作为第一个参数,并将键字符串作为第二个参数。
然后,我们的函数应返回该特定键属性所属的“值”属性的值。
示例
为此的代码将是-
const obj = { "prop": [ { "key": "FOO", "value": "Foo is wonderfull, foo is great" }, { "key": "BAR", "value": "Bar is bad, really bad" } ] }; const findByKey = (obj, key) => { const arr = obj['prop']; if(arr.length){ const result = arr.filter(el => { return el['key'] === key; }); if(result && result.length){ return result[0].value; } else{ return ''; } } } console.log(findByKey(obj, 'BAR'));
输出结果
控制台中的输出将是-
Bar is bad, really bad