點選頭像自動上傳

<div class="head" tapmode onclick="showAction()"><img id="img_src" src="../image/preview.jpg"/></div>

// 點選頭像
function showAction() {
     api.actionSheet({
         title: '上傳圖片',
         cancelTitle: '取消',
         buttons: ['拍照', '從手機相簿選擇']
     }, function(ret, err) {
         if (ret) {
             getPicture(ret.buttonIndex);
         }
     });
 }
function getPicture(sourceType) {
    if (sourceType == 1) { // 拍照
        api.getPicture({
            sourceType: 'camera',
            encodingType: 'jpg',
            mediaValue: 'pic',
            allowEdit: false,
            destinationType: 'url',
            quality: 100,
            targetWidth: 200,
            targetHeight: 200,
            saveToPhotoAlbum: true
        }, function(ret, err) {
            if(ret){
                api.showProgress({
                    style: 'default',
                    animationType: 'fade',
                    text: '圖片上傳中...',
                    modal: false
                });
                document.getElementById("img_src").src  = ret.data;//圖片連結
                uploading(ret.data)
            }
        });
    } else if (sourceType == 2) { // 從相機中選擇
        api.getPicture({
            sourceType: 'library',
            encodingType: 'jpg',
            mediaValue: 'pic',
            destinationType: 'url',
            quality: 100,
            targetWidth: 200,
            targetHeight: 200
        }, function(ret, err) {
            if(ret){
                api.showProgress({
                    style: 'default',
                    animationType: 'fade',
                    text: '圖片上傳中...',
                    modal: false
                });
                document.getElementById("img_src").src  = ret.data;//圖片連結
                uploading(ret.data)
            }
        });
    }else{
        return;
    }
}
//上傳
function uploading(avatar){
  api.ajax({
      url:'url',
      method: 'post',
      headers: {//請求頭
        Authorization: token
      },
      data: {
          files : {//圖片連結上傳
              voucher : avatar
          },
          values: {//上傳引數
              "uid":uid,
          }
      }
  },function(ret, err){
       if (ret) {
            console.log("成功")
       }else{
            console.log("失敗")
           
       }   
  })
}