使用javascipt从动态对象列表中获取价值

Question

使用javascript通过对象动态列表寻求以下结果。定义方法让我获得了不确定的价值指标。

JavaScript代码

var obj = {};
var obj_ = {
  "clist_1": "abc",
  "clist_2": "def",
  "branch_1": "efg"
}
for (let key in obj_) {
  if (key.includes("clist_")) {
    let num = key.replace(/^\D+/g, '');
    obj[num] = obj_.key;
  }
}

console.log(obj)

所需结果

{
  "1": "abc",
  "2": "def"
}

Answer 1

您可以使用bracket notation。您需要执行obj_[key]而不是obj_.key。

var obj = {};
var obj_ = {
  "clist_1": "abc",
  "clist_2": "def",
  "branch_1": "efg"
}
for (let key in obj_) {
  if (key.includes("clist_")) {
    let num = key.replace(/^\D+/g, '');
    obj[num] = obj_[key];
  }
}

console.log(obj)

Answer 2

您需要在密钥的括号中使用property accessor。

obj[num] = obj_[key];
//             ^^^^^

然后，您可以使用startsWith代替includes来检查字符串的开头部分。

var obj = {};
var obj_ = {
  "clist_1": "abc",
  "clist_2": "def",
  "branch_1": "efg"
}
for (let key in obj_) {
  if (key.startsWith("clist_")) {
    let num = key.replace(/^\D+/g, '');
    obj[num] = obj_[key];
  }
}

console.log(obj);

Answer 3

替代连锁方式：

var obj = {};
var obj_ = {
  "clist_1": "abc",
  "clist_2": "def",
  "branch_1": "efg"
};

Object.keys(obj_)
    .map(key=>key.replace(/^\D+/g, ''))
    .map(key=>obj[key]=obj_[key]);

console.log(obj);

Answer 4

您可以这样做：

const obj_ = {"clist_1": "abc","clist_2": "def","branch_1": "efg"};
const obj = Object.keys(obj_)
  .filter(k => k.startsWith('clist_'))
  .reduce((a, c) => (a[c.match(/\d+/g)] = obj_[c], a), {});
  
console.log(obj);