前言：

如(rú)果需要實現進來進行給按鈕加上買一送一的樣式，或者單擊就選中(zhōng)單個(gè)按鈕，隻能靠css結合js進行控制了，小程序暫時沒有這樣的控件。

實現效果圖：

微信小程序進來的時候自動(dòng)進行按鈕樣式的初始化，這個(gè)需要一個(gè)字段做判斷，加上正則表達式wxml文(wén)件：

   <block wx:for="{{liuliangItems}}">
      <block wx:if="{{item.one2one == 1}}">
       <button class="{{item.changeColor?'selected2':'selected1'}}" type="default" id="{{item.price}}" data-id="{{item.name}}" data-one="{{item.one2one}}" data-orderid="{{item.id}}" data-number="1" bindtap="setPrice">{{item.name}}</button>
      </block>
      <block wx:else>
       <button class="{{item.changeColor?'selected':'normal'}}" type="default" id="{{item.price}}" data-id="{{item.name}}" data-one="{{item.one2one}}" data-orderid="{{item.id}}" data-number="1" bindtap="setPrice">{{item.name}}</button>
      </block>
     </block>

wxss文(wén)件

.normal{
 box-sizing: border-box;
 flex: 0 0 21%;
 margin: 5px 5px;
 height: 50px;
 color:#1aad19;
 border:1px solid #1aad19;
 background-color:transparent;
}
.selected{
 box-sizing: border-box;
 flex: 0 0 21%;
 margin: 5px 5px;
 height: 50px;
 background-color: #F75000;
 color: white;
}
.selected1{
 box-sizing: border-box;
 flex: 0 0 21%;
 margin: 5px 5px;
 height: 50px;
 background-color: transparent;
 border:1px solid #1aad19;
 color:#1aad19;
 background-image: url(https://wxcx.llzt.net/images/hot.png) ;
 background-position:31px 0px;
 background-repeat:no-repeat;
 background-size:62%;
}
.selected2{
 box-sizing: border-box;
 flex: 0 0 21%;
 margin: 5px 5px;
 height: 50px;
 background-color: #F75000;
 color: white;
 background-image: url(https://wxcx.llzt.net/images/hot.png);
 background-position:31px 0px;
 background-repeat:no-repeat;
 background-size:62%;
}

現在的方法把集合進行循環，然後獲取當前點擊的這個(gè)按鈕進行比較，然後進行樣式的修改

   for (var i = 0; i < this.data.liuliangItems.length; i++) {
    if (e.target.dataset.orderid == this.data.liuliangItems[i].id) {
     txtArray1[i] = {
      id: this.data.liuliangItems[i].id, changeColor: true,
      price: this.data.liuliangItems[i].price, name: this.data.liuliangItems[i].name,
      one2one: this.data.liuliangItems[i].one2one
     }
    } else {
     txtArray1[i] = {
      id: this.data.liuliangItems[i].id, changeColor: false,
      price: this.data.liuliangItems[i].price, name: this.data.liuliangItems[i].name,
      one2one: this.data.liuliangItems[i].one2one
     }
    }
   }

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