javascript: function ccc() {
    if (!window.console) {
        window.console = { log: function() {} };
        return;
    }
    var me = 19;

    var Star = function() {
        this.x = 0;

        this.speed = 1;

        this.y = 0;

    };

    var score = 0;

    var strs = function() {
        var result = '';

        for (var i = 0; i < 20; i++) {
            result += "\n";

            for (var n = 0; n < 40; n++) {
                var now = '---';

                if (i == 19 && n == me) {
                    now = "码农";

                }

                stars.forEach(function(star) {
                    var x = Math.floor(star.x);

                    var y = Math.floor(star.y);
                    if (x == n && y == i) {
                        if (Math.abs(star.y - 19) < 1 && (n == me)) {
                            die();

                        }
                        now = "BUG";

                    }

                });
                result += now;


            }

        }
        result += "       得分：" + score;

        return result;

    };
    window.onkeydown = function(e) {
        if (e.keyCode == 37) {
            me -= 1;

            if (me < 0) me = 0;

        } else if (e.keyCode == 39) {
            me += 1;

            if (me > 38) me = 38;

        }
    };

    var count = 0;

    var die = function() {
        clearInterval(timer1);

        clearInterval(timer2);

        clearInterval(timer3);

        setTimeout(function() {
            console.log("游戏结束，您的得分：" + score);

        }, 100);

    };

    var stars = [];


    var timer1, timer2, timer3;

    var begin = function() {
        timer1 = setInterval(function() {
            var createCount = Math.floor(Math.random() * 5 * appearP);
            for (var i = 0; i < createCount; i++) {
                var star = new Star();

                star.x = Math.floor(Math.random() * 40);
                star.y = 0;

                star.speed = Math.random() * appearP;

                stars.push(star);

            }

        }, 1000);
        timer2 = setInterval(function() {
            stars.forEach(function(star, i) {
                star.y += star.speed;

                if (star.y >= 21) {
                    stars.splice(i, 1);

                    score++;
                }
            });
            console.log(strs());
            count++;

            if (count > 300) {
                console.clear();
                count = 0;

            }
        }, 100);

        timer3 = setInterval(function() {
            appearP *= 1.1;
        }, 3000);
    };
    console.log("输入 start(); 后即可开始《 码农躲bug》 游戏！ ");
    window.start = function() {
        appearP = 1.1;

        starts = [];

        stars = [];

        score = 0;

        me = 19;

        count = 0;

        console.log("使用键盘左右键移动最下方的码农，躲开所有的bug，bug数量和速度会一直增加，看看谁坚持的最久吧！");


        var countdown = 3;

        setTimeout(function() {
            if (countdown-- <= 1) {
                begin();

            } else {
                console.log(countdown);
                setTimeout(arguments.callee, 1000);
            }
        }, 1000);
        return ("倒计时！");
    };
    start();
};


function insertafter(newElement, targetElement) {
    var parent = targetElement.parentNode;
    if (parent.lastChild == targetElement) {
        parent.appendChild(newElement);
    } else {
        parent.insertBefore(newElement, targetElement.nextSibling);
    }
}




function loading() {
    var btn = document.createElement("button");
    btn.id = "btn";
    btn.innerHTML = "码农躲bug";
    btn.style.position = "fixed";
    btn.style.top = "0px";
    btn.style.left = "0px";
    btn.style.width = "100px";
    btn.style.height = "40px";
    btn.style.backgroundColor = "#008CBA";
    
    btn.style.zIndex = 10001;
    btn.style.fontSize = "12px";
    if (document.getElementById("btn") == null) {
        document.body.appendChild(btn);
    }

 
}
loading();



document.getElementById("btn").addEventListener("click", ccc);

 

javascript: function ccc() {
    if (!window.console) {
        window.console = { log: function() {} };
        return;
    }
    var me = 19;
    var Star = function() {
        this.x = 0;
        this.speed = 1;
        this.y = 0;
    };
    var score = 0;
    var strs = function() {
        var result = '';
        for (var i = 0; i < 20; i++) {
            result += "\n";
            for (var n = 0; n < 40; n++) {
                var now = '□□□';
                if (i == 19 && n == me) {
                    now = "■■■";
                }
                stars.forEach(function(star) {
                    var x = Math.floor(star.x);
                    var y = Math.floor(star.y);
                    if (x == n && y == i) {
                        if (Math.abs(star.y - 19) < 1 && (n == me)) {
                            die();
                        }
                        now = "■■■";
                    }
                });
                result += now;
            }
        }
        result += "\n得分：" + score;
        return result;
    };
    window.onkeydown = function(e) {
        if (e.keyCode == 37) {
            me -= 1;
            if (me < 0) me = 0;
        } else if (e.keyCode == 39) {
            me += 1;
            if (me > 38) me = 38;
        }
    };
    var count = 0;
    var die = function() {
        clearInterval(timer1);
        clearInterval(timer2);
        clearInterval(timer3);
        setTimeout(function() {

            var aaa = "游戏结束，您的得分：" + score;
            mask_msg.innerText = aaa;
        }, 100);
    };
    var stars = [];
    var timer1, timer2, timer3;
    var begin = function() {
        timer1 = setInterval(function() {
            var createCount = Math.floor(Math.random() * 5 * appearP);
            for (var i = 0; i < createCount; i++) {
                var star = new Star();
                star.x = Math.floor(Math.random() * 40);
                star.y = 0;
                star.speed = Math.random() * appearP;
                stars.push(star);
            }
        }, 1000);
        timer2 = setInterval(function() {
            stars.forEach(function(star, i) {
                star.y += star.speed;
                if (star.y >= 21) {
                    stars.splice(i, 1);
                    score++;
                }
            });
         

            mask_msg.innerText = strs();
            count++;
            if (count > 300) {
                console.clear();
                count = 0;
            }
        }, 100);
        timer3 = setInterval(function() {
            appearP *= 1.1;
        }, 3000);
    };

    window.start = function() {
        appearP = 1.1;
        starts = [];
        stars = [];
        score = 0;
        me = 19;
        count = 0;
        var mask_msg = document.getElementById("maskmsg");

        var countdown = 3;
        setTimeout(function() {
            if (countdown-- <= 1) {
                begin();
            } else {

                mask_msg.innerText = countdown;

                setTimeout(arguments.callee, 1000);
            }
        }, 1000);
  
        mask_msg.innerText = "倒计时！";
    };




    start();
};



var mask_bg = document.createElement("div");
mask_bg.id = "mask_bg";
mask_bg.style.position = "fixed";
mask_bg.style.top = "0px";
mask_bg.style.left = "0px";
mask_bg.style.width = "100%";
mask_bg.style.height = "100%";
mask_bg.style.backgroundColor = "#777";
mask_bg.style.zIndex = 10001;

if (document.getElementById("mask_bg") == null) {
    document.body.appendChild(mask_bg);
}


var mask_msg = document.createElement("div");
mask_msg.id = "maskmsg";
mask_msg.style.position = "absolute";
mask_msg.style.top = "30%";
mask_msg.style.left = "50%";
mask_msg.style.background = 'white';
mask_msg.style.width = "1000px";
mask_msg.style.height = "600px";
mask_msg.style.marginLeft = "-500px";
mask_msg.style.border = "#336699 1px solid";
mask_msg.style.textAlign = "left";
mask_msg.style.fontSize = "12px";

mask_msg.style.padding = "0.5em 3em 0.5em 3em";
mask_msg.style.zIndex = 10002;
mask_msg.innerText = "点击按钮开始";
if (document.getElementById("maskmsg") == null) {
    mask_bg.appendChild(mask_msg);
}

var btn = document.createElement("button");
btn.id = "btn";
btn.innerHTML = "开始";
btn.style.position = "fixed";
btn.style.top = "0px";
btn.style.left = "0px";
btn.style.width = "100px";
btn.style.height = "40px";
btn.style.backgroundColor = "#008CBA";
btn.style.zIndex = 10003;
btn.style.fontSize = "12px";
if (document.getElementById("btn") == null) {
    document.body.appendChild(btn);
}


document.getElementById("btn").addEventListener("click", ccc);