这是个更有真实感的效果。只需两个步骤安装。 步骤一 拷贝以下脚本贴在网页的<body>标记之内。 onLoad="fly()" 样板： <body onLoad="fly()" bgcolor="#000000" text="#FFFFFF" link="#00CCFF" vlink="#00CCFF"> 步骤二 拷贝以下脚本贴在网页紧接<body>之下。 <SCRIPT LANGUAGE="JavaScript"> <!-- Begin SmallStars = 30; LargeStars = 10; SmallYpos = new Array(); SmallXpos = new Array(); LargeYpos = new Array(); LargeXpos = new Array(); Smallspeed= new Array(); Largespeed= new Array(); ns=(document.layers)?1:0; if (ns) { for (i = 0; i < SmallStars; i++) { document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0 BGCOLOR='#FFFFF0' CLIP='0,0,1,1'></LAYER>"); } for (i = 0; i < LargeStars; i++) { document.write("<LAYER NAME='ln"+i+"' LEFT=0 TOP=0 BGCOLOR='#FFFFFF' CLIP='0,0,2,2'></LAYER>"); } } else { document.write('<div style="position:absolute;top:0px;left:0px">'); document.write('<div style="position:relative">'); for (i = 0; i < SmallStars; i++) { document.write('<div id="si" style="position:absolute;top:0;left:0;width:1px;height:1px;background:#fffff0;font-size:1px"></div>'); } document.write('</div>'); document.write('</div>'); document.write('<div style="position:absolute;top:0px;left:0px">'); document.write('<div style="position:relative">'); for (i = 0; i < LargeStars; i++) { document.write('<div id="li" style="position:absolute;top:0;left:0;width:2px;height:2px;background:#ffffff;font-size:2px"></div>'); } document.write('</div>'); document.write('</div>'); } WinHeight = (document.layers)?window.innerHeight:window.document.body.clientHeight; WinWidth = (document.layers)?window.innerWidth:window.document.body.clientWidth; for (i = 0; i < SmallStars; i++) { SmallYpos[i] = Math.round(Math.random() * WinHeight); SmallXpos[i] = Math.round(Math.random() * WinWidth); Smallspeed[i]= Math.random() * 5 + 1; } for (i = 0; i < LargeStars; i++) { LargeYpos[i] = Math.round(Math.random() * WinHeight); LargeXpos[i] = Math.round(Math.random() * WinWidth); Largespeed[i] = Math.random() * 10 + 5; } function fly() { var WinHeight = (document.layers)?window.innerHeight:window.document.body.clientHeight; var WinWidth = (document.layers)?window.innerWidth:window.document.body.clientWidth; var hscrll = (document.layers)?window.pageYOffset:document.body.scrollTop; var wscrll = (document.layers)?window.pageXOffset:document.body.scrollLeft; for (i = 0; i < LargeStars; i++) { LargeXpos[i] -= Largespeed[i]; if (LargeXpos[i] < -10) { LargeXpos[i] = WinWidth; LargeYpos[i] = Math.round(Math.random() * WinHeight); Largespeed[i] = Math.random() * 10 + 5; } if (ns) { document.layers['ln'+i].left = LargeXpos[i]; document.layers['ln'+i].top = LargeYpos[i] + hscrll; } else { li[i].style.pixelLeft = LargeXpos[i]; li[i].style.pixelTop = LargeYpos[i] + hscrll; } } for (i = 0; i < SmallStars; i++) { SmallXpos[i] -= Smallspeed[i]; if (SmallXpos[i] < -10) { SmallXpos[i] = WinWidth; SmallYpos[i] = Math.round(Math.random()*WinHeight); Smallspeed[i] = Math.random() * 5 + 1; } if (ns) { document.layers['sn'+i].left = SmallXpos[i]; document.layers['sn'+i].top = SmallYpos[i]+hscrll; } else { si[i].style.pixelLeft = SmallXpos[i]; si[i].style.pixelTop = SmallYpos[i]+hscrll; } } setTimeout('fly()', 10); } // End --> </script>
样板：
<body onLoad="fly()" bgcolor="#000000" text="#FFFFFF" link="#00CCFF" vlink="#00CCFF">
步骤二 拷贝以下脚本贴在网页紧接<body>之下。