html css js 實現展開和收起的操作方法

wxml 代碼

<view class="business-text {{ isExpanding ? 'block' : 'none' }}">小程序用 js + css +html 實現展開和收起的操作方法，實例代碼簡單，實現方式有很多種。小程序用 js + css +html 實現展開和收起的操作方法，實例代碼簡單，實現方式有很多種。</view>
<view class="business-btn" bindtap="handleExpandingChange">{{isExpanding ? "收起" : "展開"}} <text class="horn {{ isExpanding ? 'block' : 'none' }}"></text></view>

wxss 代碼

.business-text{
  margin: 0 auto;
  width: 696rpx;
  font-size: 28rpx;
  color: #3F4552;
  font-family: 'PingFangSC-Regular';
  overflow: hidden;
  text-align: justify;
}
/* 
  1.默認設置高度 隱藏其它
  2.設置兩行末尾顯示...
*/
.business-text.none {
  height: 40rpx;
  /* -webkit-line-clamp: 2;
  text-overflow: ellipsis;
  display: -webkit-box; 
  -webkit-box-orient: vertical; */
   /* 從上向下垂直排列子元素 */
 }
 /* 
  顯示方式以下三種block都可以實現 
 */
.business-text.block {
  display: block; 
  /* -webkit-line-clamp: 0; */
  /* overflow: visible; */
 }
.business-btn{
  margin: 28rpx auto 16rpx;
  width: 84rpx;
  height: 50rpx;
  line-height: 50rpx;
  text-align: center;
  border: 1px solid #eee;
  border-radius: 28rpx;
  font-size: 26rpx;
  font-family: 'PingFangSC-Regular';
  color: #C0C6D6;
  position: relative;
  padding: 0 55rpx 0 48rpx;
}
.business-btn .horn{
  width:0; 
  height:0; 
  position: absolute;
  top: 50%;
  left: 66%;
  transform: translateY(-50%);
}
.business-btn .horn.none{
  border-left: 8rpx solid transparent;
  border-right: 8rpx solid transparent;
  border-top: 12rpx solid #b9c0d0;
}
.business-btn .horn.block{
  border-left: 8rpx solid transparent;
  border-right: 8rpx solid transparent;
  border-bottom: 12rpx solid #b9c0d0;
}

js 代碼

data: {
  isExpanding: false,
}
/**
  * 展開/收起
  */
handleExpandingChange: function() {
  this.setData({
    isExpanding: !this.data.isExpanding
  })
},