Firebase new Date（）？

Question

我是Firebase的新手，我想知道如何存儲JavaScript日期並使用Firebase稍後在客戶端比較它們？

我想要做的事，如：

var someDate = new Date(); 
myRootRef.set(someDate); 

myRootRef.on('value', function(snapshot) { 
    var currDate = new Date(); 
if (currDate >= snapshot.val()){ 
    //do something 
} 

不過，我回來的null從該快照中值？

Answer 1

您也可以使用時間戳。

var timestamp = new Date().getTime(); 
myRootRef.set(timestamp); 

myRootRef.on('value', function(snapshot) { 
    var currDate = new Date(); 
    var snapshotTimestamp = snapshot.val(); 

    //you can operate on timestamps only... 
    console.log("Snapshot timestamp: " + snapshotTimestamp); 

    if(currDate.getTime() >= snapshotTimestamp) { 
     //do something 
    } 

    //...or easily create date object with it 
    console.log("Snapshot full date: " + new Date(snapshotTimestamp)); 

    if (currDate >= new Date(snapshotTimestamp)){ 
     //do something 
    } 

}); 

Answer 2

您需要使用字符串或具有值的對象設置Firebase，並且在事件中讀取相同的值。

var someDate = new Date(); 
    myRootRef.set({Date: someDate.toString()}); 

    myRootRef.on('value', function(snapshot) { 
    var msg = snapshot.val(); 
    var currDate = new Date(); 
    if (currDate >= msg.Date){ 
    //do something 
    } 
    });