json值的長度？

Question

這樣的假設數據：

var json = [ 
    { "id": "A", "status": 1, "rank": 30, "score": 0.1 }, 
    { "id": "B", "status": 1, "rank": 30, "score": 0.7 }, 
    { "id": "C", "status": 1, "rank": 60, "score": 0.8 }, 
    { "id": "AB", "status": 1, "rank": 160, "score": 0.6 }, 
    { "id": "ABC", "status": 1, "rank": 400, "score": 0.2 } 
]; 

如何獲得ID的長度是多少？

小提琴：http://jsfiddle.net/RBSC9/

---

下不工作：

var l = (json[3].id).text().length(); 
console.log("l = "+ l); 

Answer 1

使用* .lenght

var l = json[3].id.length; 
console.log("length["+json[3].id+"] = "+ l); 

http://jsfiddle.net/RBSC9/2/

Answer 2

var len = json[3].id.length; 
console.log("len = "+ len); 

Answer 3

請參閱更新小提琴鏈接http://jsfiddle.net/RBSC9/3/

var l = (json[3].id).length 

你要提length像length;不length();