填充二維數組在JS

Question

我想popoulate使用Firebug API一個二維數組，

var sites = []; 
    var siteCounter = 0; 

    //Firebase API Calls 

    var messageListRef = new Firebase('https://my.firebaseio.com'); 
    messageListRef.once('value', function(allMessagesSnapshot) { 
     allMessagesSnapshot.forEach(function(messageSnapshot) { 
     var latitude = messageSnapshot.child('latitude').val(); 
     var longitude = messageSnapshot.child('longitude').val(); 
     sites[siteCounter][0] = 'siteCounter'; 
     sites[siteCounter][1] = latitude; 
     sites[siteCounter][2] = longitude; 
     sites[siteCounter][3] = siteCounter; 
     sites[siteCounter][4] = 'This is siteCounter.'; 

     siteCounter++; 
     alert(sites[siteCounter][1] + " " + sites[siteCounter][2]); 
     }); 
    }); 

但是，這打破了網站[siteCounter] [0]，並說，這是不確定的。任何線索如何使用這個？

Answer 1

如果你想二維數組，你必須初始化這樣的：

var tab = new Array(); 

後

tab[0] = new Array(); 

試試這個代碼

sites[siteCounter] = new Array(); 
sites[siteCounter][0] = 'siteCounter'; 
sites[siteCounter][1] = latitude; 
sites[siteCounter][2] = longitude; 
sites[siteCounter][3] = siteCounter; 
sites[siteCounter][4] = 'This is siteCounter.'; 

或直接

sites[siteCounter] = new Array("siteCounter", latitude, longitude, siteCounter, "This is siteCounter."); 

Answer 2

您是否嘗試過 sites[siteCounter] = []; 之前sites[siteCounter][0]？

我假設你必須將它聲明爲一個數組才能夠將數組放入數組中。