有时候显示不出来?
<div id="ContentTop">test</div><script>
function randomBgImg()
{ var bg = new Array(8);
bg[0] = 'http://www.famaol.com/image/index02.gif';
bg[1] = 'http://www.famaol.com/image/index03.gif';
bg[2] = 'http://www.famaol.com/image/index04.gif';
bg[3] = 'http://www.famaol.com/image/index05.gif';
bg[4] = 'http://www.famaol.com/image/index06.gif';
bg[5] = 'http://www.famaol.com/image/index07.gif';
bg[6] = 'http://www.famaol.com/image/index08.gif';
bg[7] = 'http://www.famaol.com/image/index09.gif';var index = Math.floor(Math.random() *8);
//alert(document.getElementById("ContentTop"));
document.getElementById("ContentTop").style.backgroundImage='url('+bg[index]+')';
}
window.onload=function(){
randomBgImg();
};
</script>
<div id="ContentTop">test</div><script>
function randomBgImg()
{ var bg = new Array(8);
bg[0] = 'http://www.famaol.com/image/index02.gif';
bg[1] = 'http://www.famaol.com/image/index03.gif';
bg[2] = 'http://www.famaol.com/image/index04.gif';
bg[3] = 'http://www.famaol.com/image/index05.gif';
bg[4] = 'http://www.famaol.com/image/index06.gif';
bg[5] = 'http://www.famaol.com/image/index07.gif';
bg[6] = 'http://www.famaol.com/image/index08.gif';
bg[7] = 'http://www.famaol.com/image/index09.gif';var index = Math.floor(Math.random() *8);
//alert(document.getElementById("ContentTop"));
document.getElementById("ContentTop").style.backgroundImage='url('+bg[index]+')';
}
window.onload=function(){
randomBgImg();
};
</script>
Math.round(Math.random()*7)+1