问相位js中的game.physics.arcade.collide()

EN

var graphics;
var ball;

var graphics1;
var ballHome;

function create(){
  game.physics.startSystem(Phaser.Physics.ARCADE);  

    graphics=game.add.graphics(500,500);    //first circle
    game.physics.arcade.enable(graphics);
    graphics.enableBody=true;
    graphics.beginFill(0xFFFFFF,1);
    ball=graphics.drawCircle(10,10,15);
    graphics.endFill();


    graphics1=game.add.graphics(500,500);   //second circle
    game.physics.arcade.enable(graphics1);
    graphics1.enableBody = true;
    graphics1.beginFill(0xFFF55F,1);
    ballHome=graphics1.drawCircle(300,300,500);
    graphics1.endFill();

}

function update() {
     game.physics.arcade.collide(ball,ballHome); 
}