不允许电脑浏览器打开网页、只可以手机打开方法

var system = {};
        var p = navigator.platform;
        var u = navigator.userAgent;

        system.win = p.indexOf("Win") == 0;
        system.mac = p.indexOf("Mac") == 0;
        system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
        (system.win || system.mac || system.xll) && (window.location.href = 'https://www.sina.com.cn/');