代码如下：

import 'phaser';


class PlayGame extends Phaser.Scene {

    constructor() {

        super("PlayGame");
    }

    preload() {

        this.load.spritesheet('run', 'assets/_Run.png', {frameWidth: 120, frameHeight: 80});
        this.load.spritesheet('idle', 'assets/_Idle.png', {frameWidth: 120, frameHeight: 80});
        this.load.spritesheet('roll', 'assets/_Roll.png', {frameWidth: 120, frameHeight: 80});
    }

    create() {

        this.player = this.physics.add.sprite(100, 300, 'idle');
        this.player.setScale(2);


        this.floor = this.add.graphics();
        this.floor.lineStyle(1, 0x000, 1);

        this.floor.lineBetween(0, 600, 800, 600);


        this.anims.create({

            key: 'jump',
            frames: this.anims.generateFrameNumbers('jump', {start: 0, end: 2}),
            frameRate: 10,
            repeat: -1
        });

        this.anims.create({

            key: 'run',
            frames: this.anims.generateFrameNumbers('run', {start: 0, end: 9}),
            frameRate: 10,
            repeat: -1
        });

        this.anims.create({

           key: 'idle',
           frames: this.anims.generateFrameNumbers('idle', {start: 0, end: 9}),
            frameRate: 10,
            repeat: -1
        });

        this.anims.create({

            key: 'roll',
            frames: this.anims.generateFrameNumbers('roll', {start: 0, end: 11}),
            frameRate: 10,
            repeat: -1
        });

        this.input.on('pointerdown', function (pointer) {

            console.log(pointer.x, pointer.y);
        }, this);

        this.direct = 1;

        this.cursors = this.input.keyboard.createCursorKeys();
        this.player.setCollideWorldBounds(true);
    }

    update() {

        if(this.cursors.left.isDown){

            this.direct = 0;
            this.player.flipX = true;
            this.player.setVelocityX(-160);
            this.player.anims.play('run', true);
        }
        else if(this.cursors.right.isDown){

            this.direct = 1;
            this.player.flipX = false;
            this.player.setVelocityX(160);
            this.player.anims.play('run', true);
        }
        else if(this.cursors.up.isDown) {

            if(this.direct == 1)
                this.player.setVelocityX(320);
            else
                this.player.setVelocityX(-320);

            this.player.anims.play('roll', true);
        }
        else{

            this.player.setVelocityX(0);
            this.player.anims.play('idle', true);
        }


        if(this.cursors.space.isDown && this.player.body.blocked.down){

            this.player.setVelocityY(-300);
        }

    }
}

let config = {
    width: 800,
    height: 600,
    parent: 'thegame',
    scene: PlayGame,
    backgroundColor: '#fff',
    physics:{
        default: 'arcade',
        arcade: {
            gravity: { y: 300},
            debug: false
        }
    }
};

new Phaser.Game(config);

项目结构如下：

运行截图如下：

这里说明下：

if(this.cursors.space.isDown && this.player.body.blocked.down){

    this.player.setVelocityY(-300);
}

跳的话可以使用this.cursors.space.isDown。

然后再是this.player.body.blocked.down