<!-- 画三角箭头 -->
    <view class="triangle" style="{{item.myself == 1 ? &#39;right: 140rpx; background: #7ECB4B&#39; : &#39;left: 140rpx;&#39;}}"></view>

/* 三角箭头 */.body .triangle {    background: white;    width: 20rpx;    height: 20rpx;    margin-top: 26rpx;    transform: rotate(45deg);    position: absolute;
}

<view class="body" style="flex-flow: {{item.myself == 0 ? &#39;row&#39; : &#39;row-reverse&#39;}}">

data: {    hud_top: (wx.getSystemInfoSync().windowHeight - 150) / 2,
    hud_left: (wx.getSystemInfoSync().windowWidth - 150) / 2,
}

<view class="hud-container" wx:if="{{status != state.normal}}" style="top: {{hud_top}}px; left: {{hud_left}}px;">

/*悬浮提示框*/.hud-container {    position: fixed;    width: 150px;    height: 150px;    left: 50%;    top: 50%;    margin-left: -75px;    margin-top: -75px;
}

touchStart: function (e) {    // 触摸开始
    var startY = e.touches[0].clientY;    // 记录初始Y值
    this.setData({      startY: startY,      status: this.data.state.pressed
    });
  },  touchMove: function (e) {    // 触摸移动
    var movedY = e.touches[0].clientY;    var distance = this.data.startY - movedY;    // console.log(distance);
    // 距离超过50，取消发送
    this.setData({      status: distance > 50 ? this.data.state.cancel : this.data.state.pressed
    });
  },  touchEnd: function (e) {    // 触摸结束
    var endY = e.changedTouches[0].clientY;    var distance = this.data.startY - endY;    // console.log(distance);
    // 距离超过50，取消发送
    this.setData({      cancel: distance > 50 ? true : false,      status: this.data.state.normal
    });    // 不论如何，都结束录音
    this.stop();
  },

data: {  toView: ''}

reply: {// ...this.scrollToBottom()
},scrollToBottom: function () {    this.setData({      toView: 'row_' + (this.data.message_list.length - 1)
    });
  },