取得Json物件的長度以及判斷json物件是否為空

假設json為： 

Json代碼  

[{"name":'a',"age":1,"sex":"0","title":"hello","state":"0 ","id":"1"},{"name":'b',"age":2,"sex":"1","title":"bye","state":"0", "id":"2"}]  

以下是取得json物件的長度的方法： 

Js程式碼  

function getJsonObj1ength(jsonOb  

    for (var item in jsonObj ) {  

        Length++;  

    }  

  到。

Js程式碼  

alert(getJsonObjLength(str)) //2  

= = = = = = = = = = = = = = = =

= = = = = = = = = = = = = = = =

= = = = = = = = = = = = = = = = 詞

= = = = = = = = = = = = = = = = = = = = = //a, b  

    alert(json[key]); //12, 45  

}