在您的课程中，而不是:

In your class instead of:

this.dateTime = dateTime.toDate().getTime()

做this.dateTime = dateTime && dateTime.toDate().getTime()

(或更安全:this.dateTime = dateTime && dateTime.toDate && dateTime.toDate().getTime())

或者您可以通过使用一些默认值来解决它，例如

OR you could solve it by using some default value like

this.dateTime = (dateTime || defaultValue).toDate().getTime()