var person = {
name: "Harry",
age: 16,
gender: "Male"
};
// Deleting a property completely
delete person.age;
alert(person.age); // Outputs: undefined
console.log(person); // Prints: {name: "Harry", gender: "Male"}delete object.elementvar obj = {a: 5, b: 3};
delete obj["a"];
console.log(obj); // {b: 3}const { a, ...rest } = { a: 1, b: 2, c: 3 };// ES6 should be in search keyword
Reflect.deleteProperty(myObj, propNameString);
// Source referece in Chinese.// Creates a new object, myobj, with two properties, a and b.
var myobj = new Object;
myobj.a = 5;
myobj.b = 12;
// Removes the a property, leaving myobj with only the b property.
delete myobj.a;
console.log ('a' in myobj); // output: "false"