Javascript 如何获取JSON字符串的一部分？

警报告诉我：

{“消息”：“成功”，“文件ID”：399}

我想获取fileID值，在本例中为399。 谢谢。

很简单

            this.on('success', function(file, responseText) { 
                var theID = JSON.stringify(responseText);
                alert(theID);

                window.location.href = ('want to put something here');    

            });

因为responseText已经是JSON了

            this.on('success', function(file, responseText) { 
                var theID = JSON.stringify(responseText);
                alert(theID);

                window.location.href = ('want to put something here');    

            });

window.location.href = responseText.fileID;

---

因为responseText已经是JSON，所以将执行此操作。如果responseText已经是JSON格式，则：

window.location.href = responseText.fileID;

this.on('success', function(file, responseText) { 
            var theID = JSON.stringify(responseText);
            alert(theID);

            if(responseText.fileID == 399) {
                // Do something
            }
            window.location.href = ('want to put something here');    

        });

如果是字符串格式，则首先解析它：

   responseText.fileID

---

如果responseText已为JSON格式，则：

this.on('success', function(file, responseText) { 
            var theID = JSON.stringify(responseText);
            alert(theID);

            if(responseText.fileID == 399) {
                // Do something
            }
            window.location.href = ('want to put something here');    

        });

如果是字符串格式，则首先解析它：

   responseText.fileID

---

responseText.fileID

If是

JSON

对象而不是

text

responseText.fileID

If是

JSON

对象而不是

text