https://www.safe.gov.cn/safe/templateresource/372b1dfdab204181b9b4f943a8e926a6/js/sidebar-menu.js

1$.sidebarMenu = function(menu) {
2  var animationSpeed = 300;
3  
4  var li_a=$('li a',menu);
5  //$(menu).on('click', 'li a', function(e) {
6  $(li_a).click(function(e) {
7    var $this = $(this);
8    var checkElement = $this.next();
9
10    if (checkElement.is('.treeview-menu') && checkElement.is(':visible')) {
11      checkElement.slideUp(animationSpeed, function() {
12        checkElement.removeClass('menu-open');
13      });
14      checkElement.parent("li").removeClass("active");
15    }
16
17    //If the menu is not visible
18    else if ((checkElement.is('.treeview-menu')) && (!checkElement.is(':visible'))) {
19      //Get the parent menu
20      var parent = $this.parents('ul').first();
21      //Close all open menus within the parent
22      var ul = parent.find('ul:visible').slideUp(animationSpeed);
23      //Remove the menu-open class from the parent
24      ul.removeClass('menu-open');
25      //Get the parent li
26      var parent_li = $this.parent("li");
27
28      //Open the target menu and add the menu-open class
29      checkElement.slideDown(animationSpeed, function() {
30        //Add the class active to the parent li
31        checkElement.addClass('menu-open');
32        parent.find('li.active').removeClass('active');
33        parent_li.addClass('active');
34      });
35    }
36    //if this isn't a link, prevent the page from being redirected
37    if (checkElement.is('.treeview-menu')) {
38      e.preventDefault();
39    }
40  });
41}