Detailed explanation of examples of mini program development to implement the inverse selection function after clicking on the control.

微信小程序 点击控件后选中其它反选实例详解

前言：

如果需要实现进来进行给按钮加上买一送一的样式，或者单击就选中单个按钮，只能靠css结合js进行控制了，小程序暂时没有这样的控件。

实现效果图：

微信小程序进来的时候自动进行按钮样式的初始化，这个需要一个字段做判断，加上正则表达式wxml文件：

   <block wx:for="pw_liuliangItems">
      <block wx:if="pw_item.one2one == 1">
       <button class="pw_item.changeColor?&#39;selected2&#39;:&#39;selected1&#39;" type="default" id="pw_item.price" data-id="pw_item.name" data-one="pw_item.one2one" data-orderid="pw_item.id" data-number="1" bindtap="setPrice">pw_item.name</button>
      </block>
      <block wx:else>
       <button class="pw_item.changeColor?&#39;selected&#39;:&#39;normal&#39;" type="default" id="pw_item.price" data-id="pw_item.name" data-one="pw_item.one2one" data-orderid="pw_item.id" data-number="1" bindtap="setPrice">pw_item.name</button>
      </block>
     </block>

wxss文件

.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%;
}

现在的方法把集合进行循环，然后获取当前点击的这个按钮进行比较，然后进行样式的修改

   for (var i = 0; i < this.data.liuliangItems.length; i++) {
    if (e.target.dataset.orderid == this.data.liuliangItems

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