Angular 如何将嵌套对象数组动态转换为单个数组
//我有一个多重物体Angular 如何将嵌套对象数组动态转换为单个数组,angular,typescript,Angular,Typescript,//我有一个多重物体 _id: "5e5d00337c5e6a0444d00304" orderID: 10355 orderDate: "2020-03-02" user: _id: "5e2e9699a648c53154f41025" name: "xyz1" email: "abcde@gmail.com" mNumber: 12336 //我想把它放在一个数组中 orderID: 10354, 10355
_id: "5e5d00337c5e6a0444d00304"
orderID: 10355
orderDate: "2020-03-02"
user:
_id: "5e2e9699a648c53154f41025"
name: "xyz1"
email: "abcde@gmail.com"
mNumber: 12336
//我想把它放在一个数组中
orderID: 10354, 10355
orderDate:"2020-03-02","2020-03-02"
name: "xyz", "xyz1"
email: "abcd@gmail.com", "abcde@gmail.com"
mNumber: 1234536, 12336
我的主要目标是获取excel表格,在这些标题下,我可以从中获取这些数据。
像
在角度上应该怎么做?如果我理解正确,你可以这样做
objs = [
{
_id: "5e5d00337c5e6a0444d00304",
orderID: 10354,
orderDate: "2020-03-02",
user:
{
_id: "5e2e9699a648c53154f41025",
name: "xyz",
email: "abcd@gmail.com",
mNumber: 1234536
}
},
{
_id: "5e5d00337c5e6a0444d00304",
orderID: 10355,
orderDate: "2020-03-02",
user:
{
_id: "5e2e9699a648c53154f41025",
name: "xyz1",
email: "abcde@gmail.com",
mNumber: 12336
}
}
];
const arr = [];
for (const o of objs) {
arr.push([
o.orderID,
o.orderDate,
o.user.name,
o.user.email,
o.user.mNumber
]);
}
console.log(arr);
这是输出
[ [ 10354, '2020-03-02', 'xyz', 'abcd@gmail.com', 1234536 ],
[ 10355, '2020-03-02', 'xyz1', 'abcde@gmail.com', 12336 ] ]
基本上,这只是一个迭代
我将添加另一个解决方案。在本例中,您不希望描述行中的所有值,而是希望描述行中不需要的值。在这种情况下,可以使用递归函数遍历对象<代码>字段是描述哪些值去哪些值不去的对象。像这样的
const fields = { _id: false, user: { _id: false} }
function toRowRec(obj, fields) {
let row = [];
const keys = Object.keys(obj);
for (const k of keys) {
if (!fields.hasOwnProperty(k)) {
row.push(obj[k]);
} else if (typeof obj[k] === 'object' && obj[k] !== null) {
row = row.concat(toRowRec(obj[k], fields[k]));
}
}
return row;
}
let arr = []
for (const o of objs) {
arr.push(toRowRec(o, fields));
}
console.log(arr);
我省略了输入objs
(与前面相同),您将得到比以前更精确的输出
您将看到,我也省略了我要放在行中的键,为此,我只是检查键是否在
字段中对象中。您能以更可读的方式发布吗?
const fields = { _id: false, user: { _id: false} }
function toRowRec(obj, fields) {
let row = [];
const keys = Object.keys(obj);
for (const k of keys) {
if (!fields.hasOwnProperty(k)) {
row.push(obj[k]);
} else if (typeof obj[k] === 'object' && obj[k] !== null) {
row = row.concat(toRowRec(obj[k], fields[k]));
}
}
return row;
}
let arr = []
for (const o of objs) {
arr.push(toRowRec(o, fields));
}
console.log(arr);