如何从数组中获取值？

Question

我在 ASP.netCore 从我的 Api 获取信息在 angular 我有这个 :

0: {Id: 3, Role_Name: 'ITAdmin'}
1: {Id: 4, Role_Name: 'Admin'}
2: {Id: 5, Role_Name: 'user'}

并想从我的 CurrenUser 的数组中获取值像这样的数组或其他东西

var rolename  = itdamin , admin , user


 var id = 3, 4, 5

用于将rolename和RoleId分开显示

谢谢你帮助我:)

Answer 1

您可以使用 reduce 来处理您的数组并获取您想要的 ID 和规则：

// sourse array
const tmp = [{
    Id: 3,
    Role_Name: 'ITAdmin'
  }, {
    Id: 4,
    Role_Name: 'Admin'
  }, {
    Id: 5,
    Role_Name: 'user'
  },
];

// default empty target object
const defaultList = {
  ids: [],
  roles: [],
};

// handler of your sourse array
const reducedObj = tmp.reduce((obj, item) => {
  // getting id and role from array item
  const {Id, Role_Name} = item;
  
  // update list
  return {
    ids: [...obj.ids, Id],
    roles: [...obj.roles, Role_Name]
  };
}, defaultList);

// getting ids and roles from reduced object
const {ids, roles} = reducedObj;

console.log('ids: ', ids);
console.log('roles: ', roles);

更简单的方法：

// sourse array
const tmp = [{
    Id: 3,
    Role_Name: 'ITAdmin'
  }, {
    Id: 4,
    Role_Name: 'Admin'
  }, {
    Id: 5,
    Role_Name: 'user'
  },
];

// default empty target arrays
const ids = [];
const roles = [];

// handler of your sourse array
tmp.map(item => {
  // getting id and role from array item
  const {Id, Role_Name} = item;
  
  // update lists
  ids.push(Id);
  roles.push(Role_Name);
});

console.log('ids: ', ids);
console.log('roles: ', roles);

Answer 2

现在您可以找到打印 2 个数组的编辑代码

let id = []
let role = []
const input = [{
    Id: 3,
    Role_Name: 'ITAdmin'
}, {
    Id: 4,
    Role_Name: 'Admin'
}, {
    Id: 5,
    Role_Name: 'user'
}, ];

for (let index = 0; index < input.length; index++) {
    id[index] = input[index].Id;
    role[index] = input[index].Role_Name
}
console.log(id)
console.log(role)

如何从数组中获取值？

How can I get a value from an array?

arrays

angular

typescript

object