es6中什么是类的静态成员

class 类名{// "类名"是一个用户标识符 通常建议首字母大写
           属性;
           函数;
}

函数名([参数]){
     函数体语句
}

变量名 = function([参数]){
      函数体语句
}

            class Person{
                constructor(name,age,sex){// 构造函数 初始化对象的成员
                    this.name = name;// this指向构造函数新创建的对象
                    this.age = age;
                    this.sex = sex;
                }
                    tt = function(){ //普通的成员函数
	                    console.log(this.name);
	                    console.log(this.age);
	                    console.log(this.sex);
                	}	
            }
            var p = new Person('李相赫',25,'男')// p1是一个对象 通过调用构造函数对p1的三个属性进行了初始化
            p.fun();

        class Circle{// 定义类Circlie
            constructor(r){
                this.radius = r;
            };
            area(){ // 计算圆的面积
                var s = Math.PI*this.radius**2;
                return s;
            };
            // 计算圆的周长
            CircleLength = function(){
            return 2*Math.PI*this.radius;
            };
        };
        var c1 = new Circle(5);
        console.log('半径为5的圆的面积='+c1.area());
        console.log('半径为5的圆的周长='+c1.Circle_length());

		// 用类实现简单的四则运算
        class Number{// 定义类Number
            constructor(n1,n2){
                this.n1=n1;
                this.n2=n2;
            };
            add(){
                var sum = this.n1+this.n2;
                return sum;
            };
            sub(){
                var sum1 = this.n1-this.n2;
                return sum1;
            };
            mut(){
                var sum2 = this.n1*this.n2;
                return sum2;
            };
            p(){
                if(this.n2!=0){
                    var sum3 = this.n1/this.n2;
                    return sum3;
                }
            }
        }
        var p1 = new Number(12,21);
        console.log(p1.add());
        console.log(p1.sub());
        console.log(p1.mut());
        console.log(p1.p());

class 子类名 extends 父类名{
       函数体语句;
};

super([参数])

super.函数名([参数])

        class Father{ //父类(基类或超类)
            constructor(type,color){
                this.type = type;
                this.color = color;
            }
            money(){
                console.log(100);
            }
            show(){
                console.log('类型：'+this.type);
                console.log('颜色：'+this.color);
            }
        }
        class Son extends Father{ //Son是子类(又称派生类)
            constructor(type,color,weight){
                super(type,color); //调用父类的构造函数 要放在首位
                this.weight = weight;
            };
            show(){
                super.show();// 调用父类的普通成员函数
                console.log('重量：'+this.weight);
            };
            other(){
                return '子类的其他方法';
            };
        };
        var s1 = new Son('iPhone 12','黑色','3000g');//s1为子类的实例
        s1.show();
        console.log(s1.other());

        function Student(name,age,sex){
            Student.school = '西安邮电大学';// school是静态成员
            this.name = name;
            this.age = age;
            this.sex = sex;// name age sex都是实例成员
            this.show = function(){
                console.log('姓名：'+this.name);
                console.log('年龄：'+this.age);
                console.log('性别：'+this.sex);
            };
        };
        var f = new Student('李相赫',23,'男');
        f.show();
        console.log(Student.school);// 西安邮电大学
        console.log(f.school);// undefined

        class Foo{
            constructor(){
                this.color = '红色';// color是实例成员
            }
        }
        Foo.prop = 45;// prop是静态成员
        var f1 = new Foo();
        console.log('静态属性：'+Foo.prop);// 45
        console.log(f1.prop);// undefined

        class Foo{
            static prop = 45; //prop是静态成员
            constructor(){
                this.color = '红色';
            }
        }
        var f2 = new Foo();
        console.log('静态属性：'+Foo.prop);// 45
        console.log(f2.prop);// undefined

	class Person {
		sing(){
			console.log('hello');
		}
	}
	var p1 = new Person();
	var p2 = new Person();
	console.log(p1.sing === p2.sing);	// 输出结果：true