js中创建对象三种方式

	// 方法一
			function copyClass(name, age) {
				this.name = name;
				this.age = age;
				this.printInfo = function() {
					console.log(this.name);
					console.log(this.age);
				}
			}
			let obj = new copyClass("nobody", 10);
			// Calling the method of copyClass. 
			obj.printInfo();
            
            // 方法二
			var obj2 = {
				name: "",
				age: "",
				printInfo2: function() {
					console.log(this.name);
					console.log(this.age);
				}
			}

			// Initializing the parameters. 
			obj2.name = "no name";
			obj2.age = 19;

			// Using method of the object. 
			obj2.printInfo2();


			// 定义单例对象
			var obj3 = new function() {
				this.name = "";
				this.age = "";
				this.printInfo3 = function() {
					console.log(this.name);
					console.log(this.age);
				};
			}

			// Initializing object. 
			obj3.name = "anybody";
			obj3.age = 10;

			// Calling method of the object. 
			obj3.printInfo3();

			obj3.name = 'hehe';
			obj3.age = 5;
			obj3.printInfo3();


也可以通过class实现
class Person {
				constructor(name, age) {
					this.name = name;
					this.age = age;
				}
				addAge() {
					this.age++;
				}
				setName(name) {
					this.name = name;
				}
			}
			let liMing = new Person('liming',10);
			 liMing.addAge()
			 console.log(JSON.stringify(liMing))