1、同一个事件，点击显示和隐藏

$(document).ready(function(){

    $('.container .nav-header').click(function(){

      var change = $('.container .change-link')

      $('.container .menu').slideToggle(100);

      if(change.is(':hidden'))

      {

        $(change).show();

      }else{

        $(change).hide();

      }

    })

  });

2、同一个事件，点击显示和隐藏

  $(document).ready(function(){

    var winWidth = $(window).width();

    if(winWidth<641){

      var userDown = $('nav.top-nav .menu');

      var change = $('nav.top-nav .change-link');

      userDown.hide();

      change.hide();

      $('nav.top-nav').click(function(){

        userDown.toggle();

        change.toggle();

       /* if(userDown.is(':visible'))

        {

          change.show();

        }*/

      });

    }

  });

3、jq布局左侧等于右侧高度

    $(function() {

        var _leftheight = $(".focuside").height();

        var    _rightheight = $(".g-side2").height();

        if(_leftheight > _rightheight ) {

            $(".g-side2").height(_leftheight);

        }

        else {

            $(".focuside").height(_rightheight);

        }

    })

3、点击事件开启关闭

<script>

  $(function(){

    var winWidth = $(window).width();

    if(winWidth<641) {

    $('#user .nav-list').fadeOut();

      $('#user .nav-action').click(function(){

        $('#user .nav-list').toggle(100);

      });

    }

  })

</script>