WXML代码：

<view class="chat-option">
  <view class="msg-inp">
    <button type="button" hover-class="hoverbtn" bindtouchstart="touchStart" bindtouchend="touchEnd">按住说话录音</button>
    <button type="button" bindtap="playVoice">播放录音</button>
  </view>
</view>

WXSS代码：

.chat-option{width:100%;background-color:#e6e6e6;position: fixed;bottom: 0;display: flex;padding: 40rpx 20rpx;align-items: center;}
.chat-option .msg-inp{width: 100%;display: flex;}
.chat-option .msg-inp button{height: 80rpx;width: 40%;background-color: #fff;margin: 0 0 0 5%;border-radius: 20rpx;font-size: 30rpx;color: #e2e2e2;background-color: #8e8e8e;font-weight: initial;}
.chat-option .msg-inp button.hoverbtn{background-color: #828282;}

JS代码：

Page({

  data: {
    voiceIndex: 1,
    voiceInter: '',
    tempFilePaths: ''
  },

  //按住说话
  touchStart(){
    let that = this;
    wx.showLoading({
      title: '录音中'
    });
    let rec = wx.getRecorderManager();
    let options = {
      sampleRate: 44100, //采样率
      encodeBitRate: 192000, //编码码率
      format: 'mp3' //音频格式
    }
    that.data.voiceInter = setInterval(() => {
      that.data.voiceIndex++;
    }, 350);
    rec.start(options);
  },

  //松开停止
  touchEnd(){
    let that = this;
    wx.hideLoading();
    let rec = wx.getRecorderManager();
    if(that.data.voiceIndex > 1){
      that.clearInterTime();
      rec.stop();
      rec.onStop((res) => {
        //录音文件临时地址
        that.setData({
          tempFilePaths: res.tempFilePath
        });
      });
    }else{
      that.clearInterTime();
      return;
    }
  },

  //播放录音
  playVoice(){
    let that = this;
    let adc = wx.createInnerAudioContext();
    adc.src = that.data.tempFilePaths;
    adc.play();
    wx.showLoading({
      title: '录音播放中'
    });
    adc.onEnded((res) => {
      wx.hideLoading();
    });
  },

  //定时清理
  clearInterTime(){
    let that = this;
    that.setData({voiceIndex: 1});
    clearInterval(that.data.voiceInter);
  },

})