js mouse dragging object can make any div achieve drag effect_javascript skills

js mouse dragging object:

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//Define mouse dragging Object
drag=function (a,o){
var d=document;if(!a)a=window.event;
if(!a.pageX)a.pageX=a.clientX;
if(!a.pageY)a.pageY=a.clientY;
var x=a.pageX,y=a.pageY;
if(o.setCapture)
o.setCapture( );
else if(window.captureEvents)
window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);
var backData = {x : o.style.top, y : o.style.left };
d.onmousemove=function(a){
if(!a)a=window.event;
if(!a.pageX)a.pageX=a.clientX;
if (!a.pageY)a.pageY=a.clientY;
var tx=a.pageX-x parseInt(o.style.left),ty=a.pageY-y parseInt(o.style.top);
o.style.left=tx "px";
o.style.top=ty "px";
x=a.pageX;
y=a.pageY;
} ;
d.onmouseup=function(a){
if(!a)a=window.event;
if(o.releaseCapture)
o.releaseCapture();
else if (window.captureEvents)
            window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);                                                 X)a .pageX=a.clientX;
if(!a.pageY)a.pageY=a.clientY;
if(!document.body.pageWidth)document.body.pageWidth=document.body.clientWidth;
If(!document.body.pageHeight)document.body.pageHeight=document.body.clientHeight;
if(a.pageX < 1 || a.pageY < 1 || a.pageX > document .body.pageWidth || a.pageY > document.body.pageHeight){
                                                                                     > };
}


Usage:

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The code is as follows: