下面是cocos2d-js的加载模块
js代码:

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(function() {
    var createStyle = function() {
        return ".Loading{position:absolute;margin:-30px -60px;padding:0;top:50%;left:50%}" 
        + ".Loading ul{margin:0;padding:0;}" 
        + ".Loading span{color:#FFF;text-align:center;display:block;}" 
        + ".Loading li{list-style:none;float:left;border-radius:15px;width:15px;height:15px;background:#FFF;margin:5px 0 0 10px}" 
        + ".Loading li .ball,.Loading li .unball{background-color:#2187e7;background-image:-moz-linear-gradient(90deg,#2187e7 25%,#a0eaff);background-image:-webkit-linear-gradient(90deg,#2187e7 25%,#a0eaff);width:15px;height:15px;border-radius:50px}" 
        + ".Loading li .ball{transform:scale(0);-moz-transform:scale(0);-webkit-transform:scale(0);animation:showDot 1s linear forwards;-moz-animation:showDot 1s linear forwards;-webkit-animation:showDot 1s linear forwards}" 
        + ".Loading li .unball{transform:scale(1);-moz-transform:scale(1);-webkit-transform:scale(1);animation:hideDot 1s linear forwards;-moz-animation:hideDot 1s linear forwards;-webkit-animation:hideDot 1s linear forwards}" 
        + "@keyframes showDot{0%{transform:scale(0,0)}100%{transform:scale(1,1)}}" 
        + "@-moz-keyframes showDot{0%{-moz-transform:scale(0,0)}100%{-moz-transform:scale(1,1)}}" 
        + "@-webkit-keyframes showDot{0%{-webkit-transform:scale(0,0)}100%{-webkit-transform:scale(1,1)}}" 
        + "@keyframes hideDot{0%{transform:scale(1,1)}100%{transform:scale(0,0)}}" 
        + "@-moz-keyframes hideDot{0%{-moz-transform:scale(1,1)}100%{-moz-transform:scale(0,0)}}" 
        + "@-webkit-keyframes hideDot{0%{-webkit-transform:scale(1,1)}100%{-webkit-transform:scale(0,0)}}"
    };
    var createDom = function(id, num) {
        id = id || "Loading";
        num = num || 5;
        var i, item;
        var div = document.createElement("div");
        div.className = "Loading";
        div.id = id;
        var bar = document.createElement("ul");
        var list = [];
        for (i = 0; i < num; i++) {
            item = document.createElement("li");
            list.push({ball: document.createElement("div"),halo: null});
            item.appendChild(list[list.length - 1].ball);
            bar.appendChild(item)
        }
        var span = document.createElement("span");
        span.innerHTML = "Loading";
        div.appendChild(bar);
        div.appendChild(span);
        document.body.appendChild(div);
        return list
    };
    var startAnimation = function(list, callback) {
        var index = 0;
        var direction = true;
        var time = 300;
        var animation = function() {
            setTimeout(function() {
                if (callback && !callback()) {
                    return
                }
                var item = list[index];
                if (direction) {
                    item.ball.className = "ball"
                } else {
                    item.ball.className = "unball"
                }
                index++;
                if (index >= list.length) {
                    direction = !direction;
                    index = 0;
                    time = 1000
                } else {
                    time = 300
                }
                animation()
            }, time)
        };
        animation()
    };
    (function() {
        var bgColor = document.body.style.background;
        document.body.style.background = "#000";
        var style = document.createElement("style");
        style.type = "text/css";
        style.innerHTML = createStyle();
        document.head.appendChild(style);
        var list = createDom();
        startAnimation(list, function() {
            var div = document.getElementById("Loading");
            if (!div) {
                document.body.style.background = bgColor
            }
            return !!div
        })
    })()
})();