javascript - 如何在javascript中从JSON数组创建值数组

Question

请找到我的 json 数组，我想形成以下格式的数据数组:

[Sunday.a_count.value, Monday.a_count.value, Tuesday.a_count.value, Wednesday.a_count.value] - 此格式输出将是 [0, 2, 2, 3] -

最终，这些值来自周日 a_count、周一 a_count、周二 a_count 和周三 a_count。

我无法在 javascript 中使用以下 json 以上述格式形成数据，如果有人可以帮助实现这一点，那将非常有帮助。

谢谢!

[ {
  "day" : "Sunday",
  "a_count" : 0,
  "b_count" : 2,
  "c_count" : 0,
  "d_count" : 0
}, {
  "day" : "Monday",
  "a_count" : 2,
  "b_count" : 0,
  "c_count" : 0,
  "d_count" : 0
}, {
  "day" : "Tuesday",
  "a_count" : 2,
  "b_count" : 0,
  "c_count" : 0,
  "d_count" : 0
}, {
  "day" : "Wednesday",
  "a_count" : 3,
  "b_count" : 0,
  "c_count" : 0,
  "d_count" : 0
} ]

Answer 1

据我了解，您想从a_count 中获取值，可以使用.map 来实现, 像这样

var data = [ {
  "day" : "Sunday",
  "a_count" : 0,
  "b_count" : 2,
  "c_count" : 0,
  "d_count" : 0
}, {
  "day" : "Monday",
  "a_count" : 2,
  "b_count" : 0,
  "c_count" : 0,
  "d_count" : 0
}, {
  "day" : "Tuesday",
  "a_count" : 2,
  "b_count" : 0,
  "c_count" : 0,
  "d_count" : 0
}, {
  "day" : "Wednesday",
  "a_count" : 3,
  "b_count" : 0,
  "c_count" : 0,
  "d_count" : 0
} ];

var res = data.map(function (el) {
  return el.a_count;
});

console.log(res);