微信小程序学习记录（6）媒体组件audio，camera，image，live-player，live-pusher,video

camera

---

相机，摄像，扫描二维码  组件相关：https://developers.weixin.qq.com/miniprogram/dev/component/camera.html

接口相关api：https://developers.weixin.qq.com/miniprogram/dev/api/media/camera/wx.createCameraContext.html

例子：

demo.wxml

<camera class="camerarea" device-position="back" flash="auto" binderror="error">
</camera>

<view class="btn_area">
  <button bindtap="takePhoto" type="primary" class="btn">拍照</button>
</view>

<view class="btn_area">
  <button bindtap="previewImage" type="primary" class="btn">预览</button>
</view>

<view class="btn_area">
  <button bindtap="saveImage" type="primary" class="btn">保存</button>
</view>

<view class="btn_area">
  <button bindtap="startRecord" type="primary" class="btn">开始录像</button>
</view>

<view class="btn_area">
  <button bindtap="stopRecord" type="primary" class="btn">结束录像</button>
</view>

<view class="btn_area">
  <button bindtap="saveRecord" type="primary" class="btn">保存录像</button>
</view>

demo.wxss

.camerarea{
  width: 100%;
  height:750rpx;
}
.btn_area{
  margin-top: 60rpx;
  width: 750rpx;
  box-sizing: border-box;
}
.btn_area button{
  width: 80%;
}

注意改变button的样式必须.btn_area button

效果

 

image

---

图片

mode的合法值

示例：

demo.wxml

<view>保持纵横比，使图片宽高完全拉伸填满image</view>
<view class="image_area">
  <image src="../../img/0.jpg" mode="aspectFit"></image>
</view>

<view>只显示上部分区域，有部分放大效果</view>
<view class="image_area">
  <image src="../../img/0.jpg" mode="top"></image>
</view>

demo.wxss

/* pages/demo4/demo4.wxss */
.image_area{
  width: 100%;
}
.image_area image{
  width: 100%;
}

live-player和live-pusher必须是公司账号

video

---

---

播放视频，发送弹幕

组件文档：https://developers.weixin.qq.com/miniprogram/dev/component/video.html

接口文档：wx.createVideoContext  https://developers.weixin.qq.com/miniprogram/dev/api/media/video/wx.createVideoContext.html

示例：

demo.wxml

<view class="page-body">
  <view class="page-section tc">
    <video id="myVideo" src="http://wxsnsdy.tc.qq.com/105/20210/snsdyvideodownload?filekey=30280201010421301f0201690402534804102ca905ce620b1241b726bc41dcff44e00204012882540400&bizid=1023&hy=SH&fileparam=302c020101042530230204136ffd93020457e3c4ff02024ef202031e8d7f02030f42400204045a320a0201000400" binderror="videoErrorCallback" danmu-list="{{danmuList}}" enable-danmu danmu-btn controls></video> 

    <view class="weui-cells">
      <view class="weui-cell weui-cell_input">
        <view class="weui-cell__hd">
          <view class="weui-label">弹幕内容</view>
        </view>
        <view class="weui-cell__bd">
          <input bindblur="bindInputBlur" class="weui-input" type="text" placeholder="在此处输入弹幕内容" />
        </view>
      </view>
    </view>
    <view class="btn-area">
      <button bindtap="bindSendDanmu" class="page-body-button" type="primary" formType="submit">发送弹幕</button>
      <button bindtap="bindPlay" class="page-body-button" type="primary">播放</button>
      <button bindtap="bindPause" class="page-body-button" type="primary">暂停</button>
    </view>
  </view>
</view>

demo.js

function getRandomColor () {
  const rgb = []
  for (let i = 0 ; i < 3; ++i){
    let color = Math.floor(Math.random() * 256).toString(16)
    color = color.length == 1 ? '0' + color : color
    rgb.push(color)
  }
  return '#' + rgb.join('')
}

Page({
  onReady: function (res) {
    this.videoContext = wx.createVideoContext('myVideo')
  },
  inputValue: '',
    data: {
    src: '',
    danmuList:
      [{
        text: '第 1s 出现的弹幕',
        color: '#ff0000',
        time: 1
      },
      {
        text: '第 3s 出现的弹幕',
        color: '#ff00ff',
        time: 3
      }]
    },
  bindInputBlur: function(e) {
    this.inputValue = e.detail.value
  },
  bindSendDanmu: function () {
    this.videoContext.sendDanmu({
      text: this.inputValue,
      color: getRandomColor()
    })
  },
  bindPlay: function() {
    this.videoContext.play()
  },
  bindPause: function() {
    this.videoContext.pause()
  },
  videoErrorCallback: function(e) {
    console.log('视频错误信息:')
    console.log(e.detail.errMsg)
  }
})

结果类似：