function IsPC() {//获取设备是否为PC的方法
    var userAgentInfo = navigator.userAgent;
    var Agents = ["Android", "iPhone",
        "SymbianOS", "Windows Phone",
        "iPad", "iPod"];
    var flag = true;
    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) >= 0) {
            flag = false;
            break;
        }
    }
    return flag;
}

function dynamicLoadCss(url) { // 加载css方法
    var head = document.getElementsByTagName('head')[0];
    var link = document.createElement('link');
    link.type = 'text/css';
    link.rel = 'stylesheet';
    link.href = url;
    head.appendChild(link);
}

function dynamicLoadJs(url, callback) { // 加载js方法
    var head = document.getElementsByTagName('head')[0];
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;
        if (typeof(callback) == 'function') {
            script.onload = script.onreadystatechange = function () {
                if (!this.readyState || this.readyState === "loaded" || this.readyState === "complete") {
                 callback();
                 script.onload = script.onreadystatechange = null;
             }
        };
    }
    head.appendChild(script);
}