代码放在页脚：

(function () {
        var config = {
            kitId: '', // 字体项目ID
            scriptTimeout: 3000 // 3秒后放弃
        };
        var h = document.getElementsByTagName('html')[0];
        h.className += ' wf-loading';
        var t = setTimeout(function () {
            h.className = h.className.replace(/(\s|^)wf-loading(\s|$)/g, ' ');
            h.className += ' wf-inactive';
        }, config.scriptTimeout);
        var d = false;
        var tk = document.createElement('script');
        tk.src = '//use.typekit.net/' + config.kitId + '.js';
        tk.type = 'text/javascript';
        tk.async = 'true';
        tk.onload = tk.onreadystatechange = function () {
            var rs = this.readyState;
            if (d || rs && rs != 'complete' && rs != 'loaded') return;
            d = true;
            clearTimeout(t);
            try {
                Typekit.load(config);
            } catch (e) { }
        };
        var s = document.getElementsByTagName('script')[0];
        s.parentNode.insertBefore(tk, s);
    })();