手机端打泡泡游戏

打泡泡游戏主要是类似于打飞机游戏，主要是控制小鱼突出的子弹来打向下降的气泡。下面是我写的代码

下面是requestAnimationFrame()请求动画帧的兼容写法因为后面我们要用到定时器

    window.requestAnimationFrame = window.requestAnimationFrame || function (fn) {return setTimeout(fn,1000/60)};
    window.cancelAnimationFrame = window.cancelAnimationFrame || clearTimeout;

把我们需要的变量全都写出来

  //全局变量
    var oBox = document.getElementById("box"),
        oScore = document.getElementById("score"),
        oRe = document.getElementById("restart"),
        oLevel = document.getElementById("level"),
        oMap = document.getElementById("map"),
        oBiuAll = document.getElementById("BiuAll"),
        chong = document.getElementById("chong"),
        kan = document.getElementById("kankuang-bg"),
        chongChild = chong.children,
        allBiu = oBiuAll.children,
        allReChild = oRe.children,
        boxOffsetTop = oBox.offsetTop,
        boxOffsetLeft = oBox.offsetLeft;

//初始选择难度界面的点击事件

 function exe(){
        //难度选择
        var aP = oLevel.getElementsByTagName("p");
        for (var i = 0,length=aP.length; i < length; i++) {
            (function(i){
                aP[i].onclick = function (e) {
                    e = e || window.event;
                    startGame(i , {
                        x : e.clientX - boxOffsetLeft,
                        y : e.clientY - boxOffsetTop
                    });//第一个实参为序号 ，第二个实参为存储着鼠标距离map边缘距离的json
                }
            })(i);
        }

        //restart按钮
        chongChild[1].onclick = function (ev) {
            cancelAnimationFrame(oMap.bgTimer);//停止背景滚动
            oRe.style.display = "none";
            kan.style.display = "none";
            oLevel.style.display = "block";
            oScore.innerHTML = 0;
            oMap.innerHTML = "<div id='BiuAll'></div>";
            oBiuAll = document.getElementById("BiuAll");
            allBiu = oBiuAll.children;
        };
    }

开始游戏

    function startGame(level , pos){
        clearMap(); //执行 隐藏和清理
        MapBg(level); //执行 Map背景相关操作
        var p = plane(level , pos); //执行 创建我军
        enemy(level , p); //执行 创建敌军
        //enemy(level , plane(level , pos));
        oBox.score = 0;//得分清零;

    }

//隐藏和清理

  function clearMap(){
        oScore.style.display = "block";
        oLevel.style.display = "none";//隐藏关卡选择框
    }

Map背景选择与运动

  function MapBg(level) {
        // oMap.style.backgroundImage = "url('img/bg_"+(level+1)+".jpg')";

        (function m(){
            oMap.bgPosY = oMap.bgPosY || 0;
            oMap.bgPosY ++;
            oMap.style.backgroundPositionY = oMap.bgPosY + 'px';
            oMap.bgTimer = requestAnimationFrame(m);
        })();
    }

创建我军

 function plane(level , pos) {
        //创建我军图片
        var oImg = new Image(); //document.createElement("img");
        oImg.src = "img/plane_0.png";
        oImg.width = 70;
        oImg.height = 70;
        oImg.className = "plane";
        oImg.style.left = pos.x - oImg.width/2 + 'px';
        oImg.style.top = pos.y - oImg.height/2 + 'px';
        oMap.appendChild(oImg);

        //边界值
        var leftMin = -oImg.width/2,
            leftMax = oMap.clientWidth - oImg.width/2,
            topMin = 0,
            topMax = oMap.clientHeight - oImg.height/2;

        //加入mousemove事件
            document.addEventListener('touchmove',function (ev) {
                ev.preventDefault();
                var clickEvent=ev.touches[0]||ev|| window.event;
                //获取飞机实时坐标，并限制边界值
                var left = clickEvent.clientX - boxOffsetLeft - oImg.width/2;
                var top = clickEvent.clientY - boxOffsetTop - oImg.height/2;
                left = Math.max(leftMin,left);
                left = Math.min(leftMax,left);
                top = Math.max(topMin,top);
                top = Math.min(topMax,top);
                //赋值
                oImg.style.left = left + 'px';
                oImg.style.top = top + 'px';
            },{ passive: false },false);

    
        document.onmousemove = function (ev) {
            ev = ev || window.event;
            //获取飞机实时坐标，并限制边界值
            var left = ev.clientX - boxOffsetLeft - oImg.width/2;
            var top = ev.clientY - boxOffsetTop - oImg.height/2;
            left = Math.max(leftMin,left);
            left = Math.min(leftMax,left);
            top = Math.max(topMin,top);
            top = Math.min(topMax,top);
            //赋值
            oImg.style.left = left + 'px';
            oImg.style.top = top + 'px';
        };

        //调用子弹函数
        fire(oImg,level);
        return oImg;
    }

我军子弹

 function fire(oImg , level){
        oBox.biuInterval = setInterval(function () {
            if ( oBox.score >= 500 ){
                // createBiu(true , -1);
                createBiu(true , 1);
            }else{
                createBiu();
            }
        } , [100 , 200 , 200 , 15][level]);

        function createBiu(index , d){
            //创建子弹
            var oBiu = new Image();
            oBiu.src = "img/fire.png";
            oBiu.width = 30;
            oBiu.height = 30;
            oBiu.className = "biu";
            var left = oImg.offsetLeft + oImg.width/2 - oBiu.width/2;
            var top = oImg.offsetTop - oBiu.height + 5;

            if ( index ){
                left += oBiu.width*d
            }

            oBiu.style.left = left + "px";
            oBiu.style.top = top + 'px';
            oBiuAll.appendChild(oBiu);

            //子弹运动
            function m() {
                if ( oBiu.parentNode ){
                    var top = oBiu.offsetTop - 20;
                    if ( top < -oBiu.height ){
                        oBiuAll.removeChild(oBiu);
                    }else{
                        oBiu.style.top = top + 'px';
                        requestAnimationFrame(m);
                    }
                }
            }
            //将运动执行队列放后面，不然子弹会直接初始就在 top-50 的位置
            setTimeout(function(){
                requestAnimationFrame(m);
            },50);
        }
    }

创建敌军

 function enemy(level , oPlane) {
        var w = oMap.clientWidth,
            h = oMap.clientHeight;
        var num = 1;
        var speed = [5,6,8,8][level]; //敌军下落速度
        var jixia = [350,150,120,40][level];  //飞机下降的个数
        oBox.biuInterval = setInterval(function () {
            if ( oBox.score >= 500 ){
                speed = [5,6,8,8][3];
            }else {

            }

        } , 100);

        oBox.enemyIntetval = setInterval(function () {
            var index = num%30?1:0;
            //生成敌军
            var oEnemy = new Image();
            oEnemy.index = index;
            oEnemy.HP = [10,1][index];
            oEnemy.speed = speed + (Math.random()*0.6 - 0.3)*speed;
            oEnemy.speed *= index?1:0.5;
            oEnemy.src = "img/enemy_"+["big","small"][index]+".png";
            oEnemy.className = "enemy";
            oEnemy.width = [104,54][index];
            oEnemy.height = [80,40][index];
            oEnemy.style.left = Math.random()*w - oEnemy.width/2 + 'px';
            oEnemy.style.top = -oEnemy.height + 'px';
            oMap.appendChild(oEnemy);
            num ++;

            //敌军运动
            function m(){
                if ( oEnemy.parentNode ){
                    var top = oEnemy.offsetTop;
                    top += oEnemy.speed;
                    if ( top >= h && oBox.score>0 ){
                        oBox.score --; //漏掉飞机减分
                        oScore.innerHTML = oBox.score;
                        oMap.removeChild(oEnemy);
                    }else{
                        oEnemy.style.top = top + 'px';
                        //子弹碰撞检测
                        for (var i = allBiu.length - 1 ; i >= 0; i--) {
                            var objBiu = allBiu[i];
                            if ( coll(oEnemy , objBiu) ){
                                oBiuAll.removeChild(objBiu);//移除子弹
                                oEnemy.HP --;
                                if ( !oEnemy.HP ){
                                    oBox.score += oEnemy.index?2:20; //打掉飞机加分
                                    oScore.innerHTML = oBox.score;
                                    boom(oEnemy.offsetLeft,oEnemy.offsetTop,oEnemy.width,oEnemy.height,index?0:2);//敌军爆炸图
                                    oMap.removeChild(oEnemy);//移除敌军
                                    dianMusic.play(); // 爆炸声音
                                    return;
                                }
                            }
                        }
                        //我军碰撞检测
                        if ( oPlane.parentNode && coll(oEnemy,oPlane) ){
                            boom(oEnemy.offsetLeft,oEnemy.offsetTop,oEnemy.width,oEnemy.height,index?0:2);//敌军爆炸图
                            boom(oPlane.offsetLeft,oPlane.offsetTop,oPlane.width,oPlane.height,1);//我军爆炸图
                            oMap.removeChild(oEnemy);//移除敌军
                            oMap.removeChild(oPlane);//移除我军
                            GameOver();
                            return;
                        }
                        requestAnimationFrame(m);
                    }
                }
            }
            requestAnimationFrame(m);
        },[160,150,120,40][level]);

    }

爆炸函数

 function boom(l,t,w,h,i){
        var oBoom = new Image();
        oBoom.src = "img/"+["boom_small","plane_0","boom_big"][i]+".png";
        oBoom.className = 'boom'+["","2",""][i];
        oBoom.width = w;
        oBoom.height = h;
        oBoom.style.left = l + "px";
        oBoom.style.top = t + 'px';
        oMap.appendChild(oBoom);
        setTimeout(function(){
            oBoom.parentNode && oMap.removeChild(oBoom);
        },[1200,2500,1200][i]);
    }

两个物体 碰撞检测

function coll( obj1 , obj2 ){
        var T1 = obj1.offsetTop,
            B1 = T1+obj1.clientHeight,
            L1 = obj1.offsetLeft,
            R1 = L1+obj1.clientWidth;

        var T2 = obj2.offsetTop,
            B2 = T2+obj2.clientHeight,
            L2 = obj2.offsetLeft,
            R2 = L2+obj2.clientWidth;

        return !( B1 < T2 || R1 < L2 || T1 > B2 || L1 > R2 );
    }

游戏结束

 function GameOver(){
        document.onmousemove = null; //清除移动事件
        clearInterval(oBox.biuInterval);//不再产生新子弹
        clearInterval(oBox.enemyIntetval);//不再产生新敌军
        restart();
    }

结算+重新开始

 function restart(){
        oScore.style.display = "none";

        var s = oBox.score;
        var honor;

        if ( s < -300 ){
            honor = "闪避+MAX！！！";
        }else if ( s < 10 ){
            honor = "菜的一笔";
        }else if ( s < 30 ){
            honor = "抠脚侠！";
        }else if ( s < 100 ){
            honor = "初级飞机大师";
        }else if ( s < 200 ){
            honor = "渐入佳境";
        }else if ( s < 500 ){
            honor = "中级飞机大师";
        }else if ( s < 1000 ){
            honor = "高级飞机大师";
        }else if ( s < 5000 ){
            honor = "终极飞机大师";
        }else{
            honor = "孤独求败！";
        }

        oRe.style.display = "block";
        kan.style.display = "block";
        allReChild[1].children[0].innerHTML = s;
        allReChild[2].children[0].innerHTML = honor;
    }