鼠标 X Y 坐标

<script type = "text/javascript" > function mousePosition(ev) {         if(ev. pageX || ev. pageY) {                 return {x: ev.pageX, y: ev.pageY} ;         }         return {                 x: ev.clientX + document.body.scrollLeft - document.body.clientLeft,                 y: ev.clientY + document.body.scrollTop - document.body.clientTop        } ; } document.onmousemove = mouseMove; function mouseMove( ev) {     ev = ev || window.event;     var mousePos = mousePosition( ev) ;     document. getElementById('mouseXPosition').value=mousePos. x;     document. getElementById('mouseYPosition').value=mousePos. y; } </script> <fieldset>         <input id = mouseXPosition>         <input id = mouseYPosition> </fieldset>