原生js为页面添加爱心特效和判断手机端还是电脑端登录

<!-- 为页面添加爱心特效 -->
<script type="text/javascript">

    (function (window, document, undefined) {
        var hearts = [];

        window.requestAnimationFrame = (function () {
            return window.requestAnimationFrame ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame ||
             window.oRequestAnimationFrame ||
             window.msRequestAnimationFrame ||
             function (callback) {
                 setTimeout(callback, 1000 / 60);
             }
        })();

        init();

        function init() {
            css(".heart{width: 10px;height: 10px;position: fixed;background: #f00;transform: rotate(45deg);-webkit-transform: rotate(45deg);-moz-transform: rotate(45deg);}.heart:after,.heart:before{content: '';width: inherit;height: inherit;background: inherit;border-radius: 50%;-webkit-border-radius: 50%;-moz-border-radius: 50%;position: absolute;}.heart:after{top: -5px;}.heart:before{left: -5px;}");
            attachEvent();
            gameloop();
        }

        function gameloop() {
            for (var i = 0; i < hearts.length; i++) {
                if (hearts[i].alpha <= 0) {
                    document.body.removeChild(hearts[i].el);
                    hearts.splice(i, 1);
                    continue;
                }

                hearts[i].y--;
                hearts[i].scale += 0.004;
                hearts[i].alpha -= 0.013;
                hearts[i].el.style.cssText = "left:" + hearts[i].x + "px;top:" + hearts[i].y + "px;opacity:" + hearts[i].alpha + ";transform:scale(" + hearts[i].scale + "," + hearts[i].scale + ") rotate(45deg);background:" + hearts[i].color;
            }

            requestAnimationFrame(gameloop);
        }

        function attachEvent() {
            var old = typeof window.onclick === "function" && window.onclick;
            window.onclick = function (event) {
                old && old();
                createHeart(event);
            }
        }

        function createHeart(event) {
            var d = document.createElement("div");
            d.className = "heart";
            hearts.push({
                el: d,
                x: event.clientX - 5,
                y: event.clientY - 5,
                scale: 1,
                alpha: 1,
                color: randomColor()
            });

            document.body.appendChild(d);
        }

        function css(css) {
            var style = document.createElement("style");
            style.type = "text/css";
            try {
                style.appendChild(document.createTextNode(css));
            }
            catch (ex) {
                style.styleSheet.cssText = css;
            }

            document.getElementsByTagName('head')[0].appendChild(style);
        }

        function randomColor() {
            return "rgb(" + (~~(Math.random() * 255)) + "," + (~~(Math.random() * 255)) + "," + (~~(Math.random() * 255)) + ")";
        }

    })(window, document);
</script>
               <!--侧边结束-->

爱心特效

<!-- <script>
window.onload = function () {
var ooo = document.getElementById("leftmenu");
var isOnPc = (/Android|webOS|iPhone|iPad|iPod|BlackBerry/i.test(navigator.userAgent));
if (!isOnPc) {

ooo.innerHTML = "这是电脑";

} else {
ooo.innerHTML = "暂不支持手机端"
}
}
</script>--> 

判断手机端