How to delete an attribute or method of an object

send ⽤ delete keyword , You can delete the attributes of an object or ⽅ Law .

var obj = {
    };
obj.name; // undefined;
obj.name = "Lilei";
obj.name; // "Lilei"
obj.sayHello = function () {
     console.log("hello") };
obj.sayHello(); // "Hello";
delete obj.name; // true
delete obj.sayHello; // true;
obj.name; // undefined;
obj.sayHello(); // Error: undefined


 It can be seen from the above that ,  send ⽤delete You can delete the attributes of an object or ⽅ Law ,  If the deletion is successful, it will return  true,  For non-existent attributes ⾏ lead ⽤ Will return to  undefined,  Yes, it doesn't exist ⽅ Fajin ⾏
 transfer ⽤ When an error .