js 如何通过js脚本动态加载js文件及读写cookie

在前端开发中，我们不免用到读写cookie，动态引入js脚本等相关操作，怎么实现呢？请参阅下面的js函数：

[javascript] var JsHelper={
    CreateJS: function(url) {
        var h = document.getElementsByTagName("head")[0];
        var s = document.createElement("SCRIPT");
        s.charset = "UTF-8";
        s.src = url;
        h.appendChild(s);
    },
        SetCookieByDays: function(name, value, Days, domainValue) {
            var cookieValue = name + "=" + escape(value);
            if (domainValue != null)cookieValue += ";
        domain=" + domainValue;
            if (Days != null && Days != 0) {
            var exp = new Date();
            exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
            cookieValue += ";expires=" + exp.toGMTString();
        }
            document.cookie = cookieValue;
        },
       GetCookie: function(name) {
        var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
        if (arr != null) return unescape(arr[2]);
        return null;
    },
        QueryString: function(item) {
        var sValue = location.search.match(new RegExp("[\?\&]" + item + "=([^\&]*)(\&?)", "i"));
        return sValue ? sValue[1] : sValue
    }
};

摘自心灵净土

补充：web前端 , JavaScript ,