constructor(public nav: NavController) {
    this.options = {
      // max images to be selected, defaults to 15. If this is set to 1, upon
      // selection of a single image, the plugin will return it.
      maximumImagesCount: 15,

      // max width and height to allow the images to be.  Will keep aspect
      // ratio no matter what.  So if both are 800, the returned image
      // will be at most 800 pixels wide and 800 pixels tall.  If the width is
      // 800 and height 0 the image will be 800 pixels wide if the source
      // is at least that wide.
      width: 1024,
      height: 1024,

      // quality of resized image, defaults to 100
      quality: 100
    };
    ImagePicker.getPictures(this.options).then((results) => {
      this.images=results;
      for (var i = 0; i < results.length; i++) {
        console.log('Image URI: ' + results[i]);
      }
    }, (err) => {
    });
  }

 //用户上传头像
 uploadImage(){
   var opt = { maxImagesCount:1, width:100, height:100, quality:50 };
   ImagePicker.getPictures(opt).then((results) => {
     for (var i = 0; i < results.length; i++) {
       //console.log('Image URI: ' + results[i]);
       console.log('Image URI: ' + results[i]);
       //将图片上传到服务器，调用 API
     }
   }, (err) => { }) ;
 }

  doImagePicker(){
    var options:ImagePickerOptions = {

    }
    ImagePicker.getPictures(options).then((results) => {
      for (var i = 0; i < results.length; i++) {
        console.log('Image URI: ' + results[i]);
      }
    }, (err) => {
      console.log(err);
    });
  }

    getImages() {
        let options = {
            width: 100,
            height: 100,
            quality: 100
        };
        ImagePicker.getPictures(options).then(results => {
            this.images = results;
        }, (err) => {

        });
    }

  private openGallery (): void {
    let options = {
      maximumImagesCount: 8,
      width: 500,
      height: 500,
      quality: 75
    }

    ImagePicker.getPictures(options).then(
      file_uris => this._navCtrl.push(GalleryPage, {images: file_uris}),
      err => console.log('uh oh')
    );
	}

 imagePicker() {
     var options = {
        maximumImagesCount: 10,
        width: 800,
        height: 800,
        quality: 80
       };
     ImagePicker.getPictures(options).then((results) => {
       for (var i = 0; i < results.length; i++) {
           console.log('Image URI: ' + results[i]);
       }
     }, (err) => {
     });
 }