永远居中你的背景图片 dn001 2009-06-21 08:30:10 <!--要完成此效果把如下代码加入到<body>区域中--> <script> var xx var v=1 function ml() { clearTimeout(xx) window.moveBy(-v, 0); xx = setTimeout("ml()",140) } function mr() { clearTimeout(xx) window.moveBy(v, 0); xx = setTimeout("mr()",140) } function mu() { clearTimeout(xx) window.moveBy(0, -v); xx = setTimeout("mu()",140) } function md() { clearTimeout(xx) window.moveBy(0, v); xx = setTimeout("md()",140) } function ws(){ clearTimeout(xx) } function adj(i){ if (i==1){v+=1; if (v>5)v-=1} else {v-=1 if (v==0)v=1} } </script> <DIV align=center> <FORM> <INPUT onclick=mu(v,0); type=button value=向上> <INPUT onclick=ml(v,0); type=button value=向左> <INPUT onclick=mr(0,v); type=button value=向右> <INPUT onclick=md(0,v); type=button value=向下> <INPUT onclick=ws(); type=button value=停止> <BR><BR><BR> <INPUT onclick=adj(1); type=button value=加速> <INPUT onclick=adj(0); type=button value=减速> <BR></FORM></DIV>
