代码

var Ball = function(game) {    var o = game.imageByName('ball')    // var image = imageFromPath('ball.png')    o.x = 100    o.y = 200    o.speedX = 5    o.speedY = 5    o.fired = false    o.fire = function() {        o.fired = true    }    o.move = function() {        if (o.fired) {            // log('move')            if (o.x < 0 || o.x > 400) {                o.speedX = -o.speedX            }            if (o.y < 0 || o.y > 300) {                o.speedY = -o.speedY            }            // move            o.x += o.speedX            o.y += o.speedY        }    }    o.反弹 = function() {        o.speedY *= -1    }    return o}复制代码

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