您的问题是因为您没有发送有效的JSON.您需要将密钥用双引号引起来.另外，subscriptionJson是代码中的文字字符串.您需要将其作为字符串变量.

Your issue is because you're not sending valid JSON. You need to wrap the keys in double quotes. Also, subscriptionJson is a literal string in your code. You need it to be a string variable.

data: '{"subscriptions": ' + subscriptionJson + '}',

或者更好的是，只需为jQuery提供一个普通对象，然后让它为您编码值即可:

Or, even better, just provide a plain object to jQuery and let it encode the values for you:

data: { subscriptions: subscriptionJson },