无法以角度 6 处理来自 Firebase 的日期

Posted 2023-03-13

【中文标题】无法以角度 6 处理来自 Firebase 的日期

【英文标题】：Unable to process date from firebase in angular 6

【发布时间】：2019-01-15 06:32:15

【问题描述】：

 this.qS = this.afDatabase.list('path', ref => 
    return ref.limitToLast(1000);
  ).snapshotChanges().map(changes => 
    return changes.map(c => ( key1: c.payload.key,value1:c.payload.val() ));
  );
  this.qS.subscribe(values => 
    let count: number = Object.keys((values)).length;
    for(let i=0;i<count;i++)
           let const2:number=Object.keys(values[i].value1).length;  // is 3
           for(let j=0;j<const2;j++)
              console.log( values[i].value1[j]);//this line gives undefined why and How to get value from this?
            
    
  );

values[i].value1 =>[object 对象]

JSON.stringify(values[i].value1)=>
    "-LJ2PhylTGjo1Li6QxP4":"dtime":"befor_":0,"dates":"04-Aug-2018","from_t":14,"fullDetails":"Between 2 PM to 6 PM on 7-08-2018","id":1,"mDay":"7","mMonth":"08","mYear":"2018","to_t":18,"weak":2,"lan":0,"lon":0,"-LJ2PtF3X9OaH-5Lv982":"dtime":"befor_":0,"dates":"04-Aug-2018","from_t":14,"fullDetails":"Between 2 PM to 6 PM on 7-08-2018","id":1,"mDay":"7","mMonth":"08","mYear":"2018","to_t":18,"weak":2,"lan":0,"lon":0,"-LJIQjbtU7Ryz-gUcxRF":"dtime":"befor_":0,"dates":"07-Aug-2018","from_t":14,"fullDetails":"Between 2 PM to 6 PM on 8-08-2018","id":1,"mDay":"8","mMonth":"08","mYear":"2018","timestampCreated":"timestamp":1533629365655,"to_t":18,"weak":3,"lan":0,"lon":0

现在我们需要从上面的字符串中读取 fullDetails 日期。如何在打字稿中做到这一点？

【参考方案1】：

使用for in loop，因为它是一个对象：

for (var j in values[i].value1) 
    console.log(values[i].value1[j].dtime.fullDetails)
 

【讨论】：

如何获得 -LJ2PhylTGjo1Li6QxP4 ？我试过 values[i].value1[j].key 但它是未定义的

这里j 是-LJ2PhylTGjo1Li6QxP4