Angular2 关于*ngFor 嵌套循环

在项目开发中拿到的数据是这样的，要循环遍历出来。可是在ng2中好像不能直接遍历Object

  datas: any = [
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24"},
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24"},
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24"},
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24"},
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24"},
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24"},
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24"},
  ];

在搜索之后发现了这种方法可以实现。

array-ngfor.ts

import { Component } from '@angular/core';

@Component({
  selector: 'page-array-ngfor',
  templateUrl: 'array-ngfor.html',
})
export class ArrayNgfor {

  constructor() { }

  datas: Array<any> = [
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24" },
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24" },
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24" },
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24" },
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24" },
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24" },
    { num: 1, date: "2017-04-12", sellNum: "1231234", sellMpney: "1233", returnNum: "24" },
  ];

  getKeys(item) {
    return Object.keys(item);
  }
}

array-ngfor.html

<ion-header>
  <ion-navbar>
    <ion-title>关于ngfor 嵌套循环</ion-title>
  </ion-navbar>
</ion-header>

<ion-content>
  <ion-row *ngFor="let item of datas">
    <ion-col *ngFor="let key of getKeys(item)"> {{ item[key] }}</ion-col>
  </ion-row>
</ion-content>

重点的是这个方法

  getKeys(item){
        return Object.keys(item);
    }

结果：

参考于：

https://segmentfault.com/q/1010000005727687

http://stackoverflow.com/questions/40451269/typescript-sort-generic-array