利用js定义一个导航条菜单

$(".M_Button").click(function () {
  $(".M_Button").removeClass("M_Button_inner");
  $(this).addClass("M_Button_inner");
  $(".Content").hide();
  TabButton = $(this).attr('id');
  $('#co' + TabButton).css('display', 'block');
 });

.M_Button {
 float: left;
 height: 42px;
 width: 98px;
 cursor: pointer;
 line-height: 42px;
 color: #FFFFFF;
 text-align: center;
 font-size: 14px;
 background-image: url(../../images/emergency/ReffectRadius/The_pop-up_1.png);
 background-repeat: no-repeat;
 background-position: right;
}
 .M_Button:hover {
  color: #000;
  background-image: url(../../images/emergency/ReffectRadius/The_pop-up_2.png);
  background-repeat: repeat-x;
 }
.M_Button_inner {
 color: #000;
 background-image: url(../../images/emergency/ReffectRadius/The_pop-up_2.png);
 background-repeat: repeat-x;
}
.Content {
 float: left;
 height: 438px;
 width: 100%;
 /*background-image: url(../../../../images/Inspection/Hidden_danger/background.png);*/
}
.M_Content {
 height: 434px;
 width: 100%;
 z-index: 5;
 position: absolute;
 /*background-color: #666;*/
 right: 2px;
 top: 0px;
}