写法一：使用函数；

    var ClassName = function() {

        this.message = 'dat.gui';

        this.speed = 0.8;

        this.displayOutline = false;

        this.explode = function() {};

        // Define render logic ...

    };

写法二：使用类和方法；

    //The codes above equals to the codes below while writing it in class

    class ClassName {

        constructor() {

            this.message = 'dat.gui';

            this.speed = 0.8;

            this.displayOutline = false;

        }

        explode() {

            // Define render logic ...

        };

    }