如何在jquery中访问关联数组中的数组

Question

我正在从远程服务器以关联数组格式检索 JSON 数据。关联数组的结构是：

data=
{
"1":[{"project_id":1,"project":"IET1"},{"project_id":2,"project":"IET2"}],
"2":[{"project_id":3,"project":"IET3"}],
"3":[{"project_id":4,"project":"IET4"},{"project_id":5,"project":"IET5"}]
}

这是我从 ajax 响应中得到的确切格式。现在，当我尝试使用以下方式遍历它时：

var obj = JSON.parse(data, function (key, value) {
  alert(key + " " + value) // will alert => "project_id 1"
}

我正在尝试使用主索引（“1”、“2”等）进行迭代。 我怎样才能做到这一点？我搜索了很多，但没有找到任何解决方案。

Answer 1

使用 Object.keys 可能会对您有所帮助。这是一个嵌套循环.. 但有效

let data = `{
    "1":[{"project_id":1,"project":"IET1"},{"project_id":2,"project":"IET2"}],
    "2":[{"project_id":3,"project":"IET3"}],
    "3":[{"project_id":4,"project":"IET4"},{"project_id":5,"project":"IET5"}]
}`;

data = JSON.parse(data)
const keys = Object.keys(data);

keys.forEach(key => data[key].forEach(project => console.log(project.project_id + " - " + project.project)));

Answer 2

不要在JSON.parse() 中使用“reviver”回调函数——它用于在解析数据时对其进行转换。

只需解析它。然后您可以根据需要检索密钥或使用for in 循环对其进行迭代。

let data = `{
"1":[{"project_id":1,"project":"IET1"},{"project_id":2,"project":"IET2"}],
"2":[{"project_id":3,"project":"IET3"}],
"3":[{"project_id":4,"project":"IET4"},{"project_id":5,"project":"IET5"}]
}`;

const out = JSON.parse(data);

const keys = Object.keys(out);

for (key in out) {
  alert(out[key][0].project);
  console.log(key, out[key]);
}