Share a native JavaScript drag method _javascript tips

Code:

function drag (t,p) {var point = p | | | null, TARGET = T | | null, RESULTX = 0, resulty = 0; (!point)? Point = target: ';

    If there is no drag point, the drag point defaults to the entire drag element function GetPos (t) {var offsetleft = 0, offsettop = 0, offsetparent = t;
      while (offsetparent) {offsetleft+=offsetparent.offsetleft;
      Offsettop+=offsetparent.offsettop;
    offsetparent = offsetparent.offsetparent;
  return {"Top": offsettop, ' Left ': offsetleft}; function core () {var width = Document.body.clientWidth | | document.documentElement.clientWidth, height = d Ocument.body.clientHeight | | 
      Document.documentElement.clientHeight;

    MaxWidth = width-target.offsetwidth, maxheight = height-target.offsetheight; (Resultx >= maxwidth)? Target.style.left = maxwidth+ ' px ': (Resultx > 0)? target.style.left = Resultx + ' px ': ';
    Resets the default location.  (Resulty >= maxheight)? Target.style.top = maxheight + ' px ': (resulty > 0)? target.style.top = Resulty + ' px ': ';

    Resets the default location.
        Point.onmousedown=function (e) {var e = e | | window.event, COORDX = e.clientx, Coordy = E.clienty,

      POSX = GetPos (target). Left, Posy = GetPos (target).  Point.setcapture && point.setcapture ();
      Locks the mouse event onto the specified element. Document.onmousemove=function (e) {var ev = e | | window.event, MoveX = ev.clientx, Movey = ev.

        ClientY; Resultx = MoveX-(COORDX-POSX);

        The result value is the coordinate point minus the drag element's margin resulty = Movey-(coordy-posy) from the left side of the browser; (Resultx > 0)? ((Resultx < maxwidth)? target.style.left = resultx+ ' px ': target.style.left = maxwidth+ ' px '): target.style.left = ' 0px ' 
        ; (resulty > 0)?  

        ((Resulty < maxheight)? target.style.top = resulty+ ' px ': target.style.top = maxheight+ ' px '): target.style.top = ' 0px '; 
        Ev.stoppropagation && ev.stoppropagation ();
        Ev.preventdefault;
        Ev.returnvalue = false; Ev.cancelbubble = true;
      };
    };
      Document.onmouseup=function () {//when resolving a drag, the onmousedown bug of the drag point cannot be triggered when the pointer to the DOM object is not a drag point element.  
      Document.onmousemove = null;  Point.releasecapture && point.releasecapture ();
    Removes the mouse event from the specified element.
    };
      Point.onmouseup=function (e) {var e = e | | window.event;
      Document.onmousemove = null;
    Point.releasecapture && point.releasecapture ();
  };
  Core ();  
Window.onresize = core;

 }

How to use:

 Drag (t,p) 
 /* Description 
 * t means the dragged element
 * p means the drag point
 //
 
 Note: If you omit the drag point, the default drag area is the entire dragged element