页面埋点和统计

/**
 * wapfelog
 *
 * @class
 */
function WapFelog() {
}
var wapfelogMap = this.wapfelogMap = {};
WapFelog.prototype = {
    constructor: WapFelog,
    log: function (src) {
        var t = new Image();
        var n = 'wap_log_' + Math.floor(Math.random() * 2147483648).toString(36);
        wapfelogMap[n] = t;
        t.onload = t.onerror = t.onabort = function () {
            // 清空事件，因为播放gif的话会多次触发onload事件
            t.onload = t.onerror = t.onabort = null;
            wapfelogMap[n] = null;
            // 将t置为null，防止形成闭包，造成内存泄漏
            t = null;
        };
        t.src = src;
    },
    send: function (type, options, bid, actId) {
        var me = this;
        actId = actId || 100000;
        var now = new Date().getTime();
        var ctjUrl = [];
        // 上报统计的域名
        var domain = 'https://xxx.baidu.com';
        options = options || {};

        ctjUrl = ctjUrl.concat([
            'isSync=' + isSync,
            'url=' + encodeURIComponent(location.href),
            't=' + now,
            'refer=' + (document.referrer ? encodeURIComponent(document.referrer) : '')
        ]);
        if (options) {
            for (var i in options) {
                if (!options.hasOwnProperty(i)) {
                    continue;
                }
                ctjUrl.push(i + '=' + encodeURIComponent(options[i]));
            }
        }
        this.log(ctjUrl.join('&'));
    }
};
this.wapfelog = new WapFelog();

function onScroll(e) {
    $.each(config.elView, function (k, v) {
        var $el = $(k);
        $el.each(function () {
            var el = this;
            if (!el || !el.getBoundingClientRect) {
                return;
            }
            // 元素顶端到可见区域顶端的距离
            var top = el.getBoundingClientRect().top;
            // 元素底部端到可见区域顶端的距离
            var bottom = el.getBoundingClientRect().bottom; 
            // 浏览器可见区域高度。
            var se = document.documentElement.clientHeight; 
            var viewed = $(el).data('viewed');
            var viewLogged = $(el).data('viewLogged');
            // once参数控制打点一次or重复浏览重复打点
            if (v.once && viewLogged) {
                return;
            }
            if (top < se && bottom > 0) {
                if (viewed) {
                    return;
                }
                $(el).data({
                    viewed: true,
                    viewLogged: true
                });
                var index = $.isFunction(v.index) ? v.index.apply(el, arguments) : v.index;
                var param = $.isFunction(v.param) ? v.param.apply(el, arguments) : v.param;
                var cfg = $.extend(true, {}, param, {
                    index: index
                });
                wapfelog.send('pv', cfg, 1, v.actId);
            }
            else if (top >= se || bottom <= 0) {
                $(el).data({
                    viewed: false
                });
            }
        });
    });
}
$(document).on('scroll.log', onScroll).trigger('scroll');