js屏蔽手机的物理返回键

$(document).ready(function() {
    if (window.history && window.history.pushState) {
            $(window).on('popstate', function () {
            window.history.pushState('forward', null, '#');
            window.history.forward(1);
            });
        }
            window.history.pushState('forward', null, '#'); //在IE中必须得有这两行
            window.history.forward(1);
});