如何按JSON元素排序

Question

每个数组都有以下数据：

{{ id: 39, treaty_number: "qwe", insurant_name: "222", belonging_to_the_holding_company: "test", date_start: "2016-04-15", etc }}

如何按升序date_start对每个数组进行排序？
我正在写Angular 4和typescript v.2.4.1。这是可能的，纯粹的JS。谢谢！

Answer 1

如果您有ISO 8601个日期，则可以使用String#localeCompare对其进行排序。

public class CameraView extends Activity implements SurfaceHolder.Callback, OnClickListener{
        private static final String TAG = "CameraTest";
        Camera mCamera;
        boolean mPreviewRunning = false;
    @SuppressWarnings("deprecation")
    public void onCreate(Bundle icicle){
        super.onCreate(icicle);
        Log.e(TAG, "onCreate");

        getWindow().setFormat(PixelFormat.TRANSLUCENT);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.cameraview);
        ImageView img = (ImageView) findViewById(R.id.blankImage);

        if(MainActivity.isBlack)
            img.setBackgroundResource(android.R.color.black);
        else
            img.setBackgroundResource(android.R.color.white);

        mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
        mSurfaceView.setOnClickListener(this);
        mSurfaceHolder = mSurfaceView.getHolder();
        mSurfaceHolder.addCallback(this);
        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState){
        super.onRestoreInstanceState(savedInstanceState);
    }


    Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {

        public void onPictureTaken(byte[] data, Camera camera) {
            // TODO Auto-generated method stub
            if (data != null){
                //Intent mIntent = new Intent();
                //mIntent.putExtra("image",imageData);

                mCamera.stopPreview();
                mPreviewRunning = false;
                mCamera.release();

                 try{
                     BitmapFactory.Options opts = new BitmapFactory.Options();
                     Bitmap bitmap= BitmapFactory.decodeByteArray(data, 0, data.length,opts);
                     bitmap = Bitmap.createScaledBitmap(bitmap, 300, 300, false);
                     int width = bitmap.getWidth();
                     int height = bitmap.getHeight();
                     int newWidth = 300;
                     int newHeight = 300;

                     // calculate the scale - in this case = 0.4f
                     float scaleWidth = ((float) newWidth) / width;
                     float scaleHeight = ((float) newHeight) / height;

                     // createa matrix for the manipulation
                     Matrix matrix = new Matrix();
                     // resize the bit map
                     matrix.postScale(scaleWidth, scaleHeight);
                     // rotate the Bitmap
                     matrix.postRotate(-90);
                     Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
                             width, height, matrix, true);
                     MainActivity.image.setImageBitmap(resizedBitmap);

                 }catch(Exception e){
                     e.printStackTrace();
                 }
                //StoreByteImage(mContext, imageData, 50,"ImageName");
                //setResult(FOTO_MODE, mIntent);
                setResult(585);
                finish();
            }       
        }
    };

    protected void onResume(){
        Log.e(TAG, "onResume");
        super.onResume();
    }

    protected void onSaveInstanceState(Bundle outState){
        super.onSaveInstanceState(outState);
    }

    protected void onStop(){
        Log.e(TAG, "onStop");
        super.onStop();
    }

    @TargetApi(9)
    public void surfaceCreated(SurfaceHolder holder){
        Log.e(TAG, "surfaceCreated");
        mCamera = Camera.open(MainActivity.cameraID);
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        Log.e(TAG, "surfaceChanged");

        // XXX stopPreview() will crash if preview is not running
        if (mPreviewRunning){
            mCamera.stopPreview();
        }

        Camera.Parameters p = mCamera.getParameters();
        p.setPreviewSize(300, 300);

        if(MainActivity.cameraID == 0){
            String stringFlashMode = p.getFlashMode();
            if (stringFlashMode.equals("torch"))
                    p.setFlashMode("on"); // Light is set off, flash is set to normal 'on' mode
            else
                    p.setFlashMode("torch");
        }

        mCamera.setParameters(p);
        try{
            mCamera.setPreviewDisplay(holder);
        }catch (Exception e){
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        mCamera.startPreview();
        mPreviewRunning = true;
        mCamera.takePicture(null, mPictureCallback, mPictureCallback);
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.e(TAG, "surfaceDestroyed");
        //mCamera.stopPreview();
        //mPreviewRunning = false;
        //mCamera.release();
    }

    private SurfaceView mSurfaceView;
    private SurfaceHolder mSurfaceHolder;

    public void onClick(View v) {
        // TODO Auto-generated method stub
        mCamera.takePicture(null, mPictureCallback, mPictureCallback);
    }

}

Answer 2

您可以尝试这样的事情：

jsonData.forEach(eachArray => {
   eachArray.sort( (aob, bob) => {
         if( aob.date_start < bob.date_start ) {
           return 1;
         } else if(aob.date_start > bob.date_start ) {
             return -1;
         }
         return 0;
   });
});