js 手动插入meta标签和script标签

        // 插入 meta 标签
        var oMeta = document.createElement(\'meta\');
        oMeta.content = \'width=device-width, initial-scale=1.0, maximum-scale=1.0,minimum-scale=1.0, user-scalable=0\';
        oMeta.name = \'viewport\';
        document.getElementsByTagName(\'head\')[0].appendChild(oMeta);
        // 插入 script 标签
        var script = document.createElement("script");
        script.type = "text/javascript";
        script.src = "index.js";
        document.getElementsByTagName(\'head\')[0].appendChild(script);