浏览器后退时必定会有一些消息，这里使用jquery判断浏览器后退并弹出消息

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print?01 jQuery(document).ready(function ($) {

02 if (window.history && window.history.pushState) {

03 $(window).on('popstate', function () {

04 var hashLocation = location.hash;

05 var hashSplit = hashLocation.split("#!/");

06 var hashName = hashSplit[1];

07 if (hashName !== '') {

08 var hash = window.location.hash;

09 if (hash === '') {

10 alert("Back button isn't supported. You are leaving this application on next clicking the back button");

11 }

12 }

13 });

14 window.history.pushState('forward', null, './#forward');

15 }

16 });

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