訪問嵌套的json數組對象並確定數組長度

Question

這裏是我的json文件，我試圖訪問組內的屬性，如homeTeam和markerImage。

如何確定競賽中的團體數量。請幫忙！

{ 
    "competition":{ 
     "group1":[ 
     { 
      "homeTeam":"Lawrence Library", 
      "markerImage":"images/red.png", 
     }, 
     { 
      "homeTeam":"Hamilton Library", 
      "markerImage":"images/white.png", 

     }, 
     { 
      "homeTeam":"Applebees", 
      "markerImage":"images/newcastle.png", 

     } 
     ], 
     "group2":[ 
     { 
      "homeTeam":"Lawrence Library", 
      "markerImage":"images/red.png", 

     }, 
     { 
      "homeTeam":"Hamilton Library", 
      "markerImage":"images/white.png", 

     }, 
     { 
      "homeTeam":"Applebees", 
      "markerImage":"images/newcastle.png", 
     } 
     ] 
    } 
} 

Answer 1

對象的數量確定的數量您可以使用競賽對象中的羣組

Object.keys(obj.competition).length 

console.log(Object.keys(obj.competition).length); 

而且循環trought您的組試一下這個

for(var x in Object(obj.competition.group1)){ 
    var newObj = Object(obj.competition.group1[x]); 
    console.log(newObj.homeTeam + ' and '+ newObj.markerImage); 
} 

Answer 2

1. 解析您的JSON對象並將其存儲在一個JavaScript對象
2. 使用下劃線和LO-短跑庫來計算

Link to calculate it with Underscore and Lo-Dash libraries