javascript - 如何构建 JSON 键以动态查找值

Question

背景

我正在创建一个引擎来从 different JSON 中获取值文件，每个文件都有 different structure 。我正在寻找store the key as string (or array)的方法在静态文件中，并使用键来获取值。

要存储在静态文件中的字符串或数组形式的键可能类似于 hello.world.that.is.something和that.is.something.different或数组 ["hello", "world", "that", "is", "something"]和["that", "is", "something", "different"] .

鉴于下面的示例数据，有什么方法可以检索值 [1, 2, 3, 4, 5]和Noo!!!来自预构建 key (存储在某处)？

示例数据

let data = {
  hello: {
    world: {
      that: {
        is: {
          something: [1, 2, 3, 4, 5]
        }
      }
    }
  },
  that: {
    is: {
      something: {
        different: "Noo!!!"
      }
    }
  }
}

预期数据

data[pre_build_keys_1] // [1, 2, 3, 4, 5]
data[pre_build_keys_2] // Noo!!!

Answer 1

您可以使用 eval() 来评估字符串并将其视为节点/变量，假设您已声明了与评估的字符串等效的变量名称。

let data = {
  hello: {
    world: {
      that: {
        is: {
          something: [1, 2, 3, 4, 5]
        }
      }
    }
  },
  that: {
    is: {
      something: {
        different: "Noo!!!"
      }
    }
  }
}

let pre_build_keys_1 = "data.hello.world.that.is.something"
let pre_build_keys_2 = "data.that.is.something.different"

console.log(eval(pre_build_keys_1))
console.log(eval(pre_build_keys_2))