微信小程序实现多个按钮的颜色状态转换

 <block wx:for="{{pres}}">
  <view class='foot_tab' data-id="{{index}}" style="{{index==id? 'color:rgb(91, 207, 97)':'color:#ddd'}}" bindtap='changeColor'>
  <view class="icon">
   <icon class="iconfont {{item.img_type}}"></icon>
  </view>
  <view>{{item.text}}</view>
  </view>
 </block>

var id;
Page({
 data: {
 pres: [{ img_type: 'icon-baomihua', text: '电影' }, { img_type:"icon-yonghu",text:'我的'}],
 id:0
 },changeColor: function(e){
 var id=e.currentTarget.dataset.id;
 this.setData({
  id:id,
 }); 
 }
})

.footer {
 width: 100%;
 height: 50px;
 position: fixed;
 bottom: 0px;
 display: flex;
 flex-direction: row;
 justify-content: space-around;
 border-top: 1px solid rgb(226, 226, 226);
}
 
.foot_tab {
 width: 40px;
 height: 50px;
 font-size: 12px;
 display: flex;
 align-items: center;
 flex-direction: column;
}
 
.icon {
 width: 30px;
 height: 30px;
 /* background-color: #ccc; */
 text-align: center;
}

@font-face {
 font-family: 'iconfont'; /* project id 794639 */
 src: url('//at.alicdn.com/t/font_794639_1jyu0w9tzqh.eot');
 src: url('//at.alicdn.com/t/font_794639_1jyu0w9tzqh.eot?#iefix') format('embedded-opentype'),
 url('//at.alicdn.com/t/font_794639_1jyu0w9tzqh.woff') format('woff'),
 url('//at.alicdn.com/t/font_794639_1jyu0w9tzqh.ttf') format('truetype'),
 url('//at.alicdn.com/t/font_794639_1jyu0w9tzqh.svg#iconfont') format('svg');
}
 
.iconfont {
 font-family:"iconfont" !important;
 font-size:60rpx;
 font-style:normal;
 -webkit-font-smoothing: antialiased;
 -moz-osx-font-smoothing: grayscale;
}
 
.icon-baomihua:before{content: '\e622';}
.icon-yonghu:before{content: '\e600';}