Q.想利用JS中的move函数实现小图的斜线下移，但是明明代码几乎一样，left的移动可以实现，top却怎么也动不了<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>台球桌</title><style type="text/css">*{ padding:0; margin:0;}div{ background:url(../PICTURE/table.JPG) no-repeat; height:260px; width:465px;}#ball{}</style><script>function init(){ var timer = setInterval("move()",50); }function move(){ var ball = document.getElementById("ball"); left = parseInt(ball.style.left); left += 1; top = parseInt(ball.style.top); top += 1; ball.style.left = left + "px"; ball.style.top = top + "px"; }</script></head><body onload="init()"><div><img src="../PICTURE/ball.png" id="ball" style="position:absolute;left:6px;top:5px;"/></div></body></html>
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