如何從JSON對象獲取價值？

Question

我是JSON的新手，實際上我不知道如何從內部對象獲取價值。 現在，我需要從JSON對象響應中獲取“描述”值。

JSON數據：

{"Fault":{"faultcode":"Client", "faultstring":"An exception has been raised as a result of client data.", "detail":{"Errors":{"ErrorDetail":{"Severity":"Hard", "PrimaryErrorCode":{"Code":"111285", "Description":"The postal code 95472 is invalid for FL United States."}}}}}}

http://www.jsoneditoronline.org/?id=2ce7ac5f329bd18f06000788ba7946dc

預期結果：

郵政編碼95472對美國佛羅里達州無效。

樣例代碼：

       success    : function(response) 
        {                       
            //alert("response="+response);         
alert("Description="+Fault.detail.Errors.ErrorDetail.PrimaryErrorCode.Description);    
        }

Answer 1

可以使用JSON.parse()方法解析JSON字符串，並使用String#match方法從字符串中獲取數字。

 var json = '{"Fault":{"faultcode":"Client", "faultstring":"An exception has been raised as a result of client data.", "detail":{"Errors":{"ErrorDetail":{"Severity":"Hard", "PrimaryErrorCode":{"Code":"111285", "Description":"The postal code 95472 is invalid for FL United States."}}}}}}' console.log("Description=" + JSON.parse(json).Fault.detail.Errors.ErrorDetail.PrimaryErrorCode.Description.match(/\\d+/)[0]); 

---

如果您有一個有效的js對象（可能已經解析過），則無需再次解析它。

 var obj = {"Fault":{"faultcode":"Client", "faultstring":"An exception has been raised as a result of client data.", "detail":{"Errors":{"ErrorDetail":{"Severity":"Hard", "PrimaryErrorCode":{"Code":"111285", "Description":"The postal code 95472 is invalid for FL United States."}}}}}}; console.log("Description=" + obj.Fault.detail.Errors.ErrorDetail.PrimaryErrorCode.Description.match(/\\d+/)[0]);