使用NSDate（）作为Parse.com的密钥保存Dicitionary失败

Question

我正在尝试将[NSDate: Double]类型的字典保存到PFUser.currentUser's记录中：

let user = PFUser.currentUser()!
let date = NSDate()
user["savedDictionary"] = [date: 1.0] // error, see below. ["test": 1.0] works though

user.saveInBackgroundWithBlock { (success: Bool, error: NSError?) -> Void in
    if error == nil {
        print("Dictionary uploaded!")
    } else {
       print(error)
    }
}

我得到的错误：

Caught "NSInvalidArgumentException" with reason "Invalid (non-string) key in JSON dictionary":

此错误还会导致PFUser.currentUser注销。

Answer 1

将日期键转换为字符串：

Here is my code:
var firstPart;
var secondPart;
var str = "hello123"
alert(str.split(""));