//直接跳转
window.location.href="b.html";
//返回上一级页面
window.history.back(-1);
//返回下一级页面
window.history.go(-1);

jq监听后退事件

<script type="text/javascript">
  $(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);
        window.location.href="2.html";//执行操作
      });
    }
  window.history.pushState('forward', null, '#'); //在IE中必须得有这两行
  window.history.forward(1);
});