<camera device-position="{{value}}" flash="off" binderror="error" style="width: 90%; height: 300px;"></camera>
 <view class="weui-cell__ft">
    <switch checked bindchange='switchChange' />
 </view>
<button type="primary" bindtap="takePhoto">拍照</button>
<view>預覽</view>
<image mode="widthFix" src="{{src}}"></image>
 

在js裡

Page({
  /**
   * 頁面的初始資料
   */
  data: {
    value: '',
    src: null
  },
  switchChange: function (e) {
    console.log(e);
    if (e.detail.value) {
      this.setData({ value: 'front' })
    } else {
      this.setData({ value: 'back' })
    }
  },
  takePhoto() {
    const ctx = wx.createCameraContext()
    ctx.takePhoto({
      quality: 'high',
      success: (res) => {
        this.setData({
          src: res.tempImagePath
        })
        wx.showLoading({
          title: '正在核驗身份...',
        })
        this.setData({ logindisabled: true });

        wx.uploadFile({
          //  url:app.globalData.url.login,
          url: 'http://www.anyangjie.top/server/index.php/home/index/login',
 

          filePath: res.tempImagePath,
          name: 'file',
          success: (res) => {
            var data = res.data
            console.log(res)
            wx.hideLoading();
            this.setData({ logindisabled: false });

            // var data = res.data
            // //  console.log(data);
            wx.showModal({
              title: '提示',
              content: data,
              showCancel: false
            })
          }
        })

      }
    })
  },
  error(e) {
    console.log(e.detail);
  },}）
 

在後臺裡寫圖片上傳upload方法

    //接受檔案上傳
    public function upload($id=''){

      $no = M('student')->where("id = '$id'")->getField('no');
      $dir = "./Uploads/studentface/";
      if(!file_exists($dir)){
        mkdir($dir,0777,true);
      }

        $upload = new \Think\Upload();// 例項化上傳類
        $upload->maxSize = 2048000 ;// 設定附件上傳大小
        $upload->exts = array('jpg', 'gif', 'png', 'jpeg');// 設定附件上傳型別
        $upload->rootPath = $dir; // 設定附件上傳根目錄
        $upload->savePath = ''; // 設定附件上傳（子）目錄
        $upload->saveName = $no;
        $upload->replace = true;//覆蓋
        $upload->autoSub = false;    //阻止建資料夾
        $info = $upload->uploadOne($_FILES['file']); // 上傳檔案
        if(!$info) {
            // 上傳錯誤提示錯誤資訊
            return $this->ajaxReturn(array('error'=>true,'msg'=>$upload->getError()));
        }else{
            // 上傳成功 獲取上傳檔案資訊
            // return $this->ajaxReturn(array('error'=>false,'msg'=>$info['savepath'].$info['savename'],'id'=>$id));
            $path = $dir.$info['savepath'].$info['savename'];

            $file = file_get_contents($path);
            $img = base64_encode($file);

            $this->facevaild($no,$img);

            $m = M('head');

            $model = $m->where("no = {$no}")->find();

            if($model){
              $data['base64'] = $img;
              $data['path'] = $path;
              $ret = M('head')->where("no = {$no}")->save($data);
            }else{
              $data['no'] = $no;
              $data['base64'] = $img;
              $data['path'] = $path;
              $ret = M('head')->add($data);
            }
            echo "資訊採集成功";
        }
    }