AngularJS实现按钮提示与点击变色效果

<style type="text/css">
  *{margin: 0px;padding: 0px;}
  .bucSelectedButton{width: 100px;line-height: 30px;text-align: center;position: relative;}
  .bucSelected {border:1px solid rgb(195,195,195);color:#000;cursor: pointer;border-radius: 6px;background-color: rgb(255,255,255);}
  .bucSelectedHover{border: 1px solid rgb(74,201,255);color: rgb(74,201,255);cursor: pointer;border-radius: 6px;background-color: rgb(238,249,254);}
  .bucSelectedHover .tip {color: rgb(0,0,0);background-color: rgb(255,255,255);}
 </style>

<div ng-controller="bucTipController">
 <!-- 指令 -->
 <buc-button id="numberType" my-title="按钮" tip-title = "这个是提示" style="margin-top:60px;"></buc-button>
</div>

<script type="text/javascript">
var app = angular.module("tip",[]);
app.controller("bucTipController",function(){

})
.directive("bucButton",function(){
 return {
  restrict : 'E',
  replace : true,
  scope : {
   myTitle : "@",
   id : "@",
   tipTitle : "@"
  },
  template : "<button class='bucSelectedButton bucSelected' ng-click='clicked()' ng-mouseover = 'mouseover()' ng-mouseout = 'mouseout()'>{{myTitle}}\
    <div style='border:1px solid #dcdcdc;border-radius:6px;width:auto;height:20px;line-height:20px;position:absolute;top:-40px;padding:5px;white-space:nowrap;background-color:#fafafa;display:none;color:#000;left:20px;' class='tip'>{{tipTitle}}\
     <span style='position:absolute;top:25px;left:10px;background-color:#fafafa;border:1px solid #dcdcdc;width:10px;height:10px;transform:rotate(45deg);border-left:none;border-top:none;'>\
     </span>\
    </div>\
    </button>",
  link : function(scope,elem,attrs) {
   scope.mouseover = function(){
    $(".tip").show();
   }

   scope.mouseout = function(){
    $(".tip").hide();
   }

   scope.clicked = function(){
    elem.toggleClass("bucSelectedHover");
    $(".tip").hide();
   }
  }
 }
})
</script>