Native JS implementiert das Spiel „Don't Step on White Block' (3)

<style>
    * {
        margin: 0;
        padding: 0;
    }

    .box {
        margin: 50px auto 0 auto;
        width: 400px;
        height: auto;
        border: solid 1px #222;
    }

    #cont {
        width: 400px;
        height: 600px;
        position: relative;
        overflow: hidden;
    }

    #go {
        width: 100%;
        height: 600px;
        position: absolute;
        top: 0;
        font: 700 60px &#39;微软雅黑&#39;;
        text-align: center;
        z-index: 99;
    }

    #go span {
        cursor: pointer;
        background-color: #fff;
        border-bottom: solid 1px #222;
    }

    #main {
        width: 400px;
        height: 600px;
        position: relative;
        top: -150px;
    }

    .row {
        width: 400px;
        height: 150px;
    }

    .row div {
        width: 99px;
        height: 149px;
        border: solid 1px #222;
        float: left;
        border-top-width: 0;
        border-left-width: 0;
        cursor: pointer;
    }
    #count {
        border-top: solid 1px #222;
        width: 400px;
        height: 50px;
        font: 700 36px/50px &#39;微软雅黑&#39;;
        text-align: center;
    }

</style>

<script>
    var main = document.getElementById(&#39;main&#39;)
    go = document.getElementById(&#39;go&#39;)
    count = document.getElementById(&#39;count&#39;);

    cols = [&#39;#1AAB8A&#39;, &#39;#E15650&#39;, &#39;#121B39&#39;, &#39;#80A84E&#39;];

    function CDiv(classname) {
        var Div = document.createElement(&#39;div&#39;)
        index = Math.floor(Math.random() * 4)
        Div.className = classname
        for (var i = 0; i < 4; i++) {
            var iDiv = document.createElement(&#39;div&#39;)
            Div.appendChild(iDiv)
        }
        if (main.children.length == 0) {
            main.appendChild(Div);
        } else {
            main.insertBefore(Div, main.children[0]);
        }

        Div.children[index].style.backgroundColor = cols[index];
        Div.children[index].className = "i";
    }

    function move(obj) {
        //默认速度与计分
        var speed = 5, num = 0;
        obj.timer = setInterval(function () {
            //速度
            var step = parseInt(getComputedStyle(obj, null)[&#39;top&#39;]) + speed;
            obj.style.top = step + &#39;px&#39;
            if (parseInt(getComputedStyle(obj, null)[&#39;top&#39;]) >= 0) {
                CDiv(&#39;row&#39;);
                obj.style.top = -150 + &#39;px&#39;;
            }
            if (obj.children.length == 6) {
                for (var i = 0; i < 4; i++) {
                    if (obj.children[obj.children.length - 1].children[i].className == &#39;i&#39;) {
                        //游戏结束
                        obj.style.top = &#39;-150px&#39;;
                        count.innerHTML = &#39;游戏结束,最高得分: &#39; + num;
                        //关闭定时器
                        clearInterval(obj.timer);
                        //显示开始游戏
                        go.children[0].innerHTML = &#39;游戏结束&#39;;
                        go.style.display = "block";
                    }
                }
                obj.removeChild(obj.children[obj.children.length - 1]);
            }
            //点击与计分
            obj.onmousedown = function (event) {
                //点击的不是白盒子
                // 兼容IE
                event = event || window.event;
                if ((event.target ? event.target : event.srcElement).className == &#39;i&#39;) {
                    //点击后的盒子颜色
                    (event.target ? event.target : event.srcElement).style.backgroundColor = "#bbb";
                    //清除盒子标记
                    (event.target ? event.target : event.srcElement).className = &#39;&#39;;
                    //计分
                    num++;
                    //显示得分
                    count.innerHTML = &#39;当前得分: &#39; + num;

                }
                else {
                    //游戏结束
                    obj.style.top = 0;
                    count.innerHTML = &#39;游戏结束,最高得分: &#39; + num;
                    //关闭定时器
                    clearInterval(obj.timer);
                    //显示开始游戏
                    go.children[0].innerHTML = &#39;游戏结束&#39;;
                    go.style.display = "block";
                }
                //盒子加速
                if (num % 10 == 0) {
                    speed++;
                }
            }
            //松开触发停止
            obj.onmouseup = function (event) {

            }

        }, 20)


    }
    go.children[0].onclick = function () {
        if (main.children.length) {
            //暴力清楚main里面所有盒子
            main.innerHTML = &#39;&#39;;
        }
        //清空计分
        count.innerHTML = &#39;游戏开始&#39;;
        //隐藏开始盒子
        this.parentNode.style.display = "none";
        move(main);
    }
</script>