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ObjectId.valueOf()
Returns the value of the 以小写十六进制字符串形式返回ObjectId() as a lowercase hexadecimal string. ObjectId()的值。This value is the 该值是str attribute of the ObjectId() object.ObjectId()对象的str属性。
The following example calls the 以下示例调用valueOf() method on an ObjectId():ObjectId()上的valueOf()方法：
ObjectId("507c7f79bcf86cd7994f6c0e").valueOf()
This will return the following string:这将返回以下字符串：
507c7f79bcf86cd7994f6c0e
You can confirm the type of this object using the following operation:您可以使用以下操作确认此对象的类型：
typeof ObjectId("507c7f79bcf86cd7994f6c0e").valueOf()