js监听浏览器后退事件

$(document).ready(function(e) {
var counter = 0;
if (window.history && window.history.pushState) {
$(window).on('popstate', function () {
window.history.pushState('forward', null, '#');
window.history.forward(1);
alert("不可回退");
});
}

window.history.pushState('forward', null, '#'); //在IE中必须得有这两行
window.history.forward(1);
});