Add a rain effect to your web page

<style> a:hover{color:#036;} </style> <script language="javascript"> var rate = 20; var obj; var act = 0; var elmH = 0; var elmS = 128; var elmV = 255; var clrOrg; var TimerID; if (navigator.appName.indexOf("Microsoft",0) != -1 && parseInt(navigator.appVersion) >= 4) { Browser = true; } else { Browser = false; } if (Browser) { document.onmouseover = doRainbowAnchor; document.onmouseout = stopRainbowAnchor; } function doRainbow() { if (Browser && act != 1) { act = 1; obj = event.srcElement; clrOrg = obj.style.color; TimerID = setInterval("ChangeColor()",100); } } function stopRainbow() { if (Browser && act != 0) { obj.style.color = clrOrg; clearInterval(TimerID); act = 0; } } function doRainbowAnchor() { if (Browser && act != 1) { obj = event.srcElement; while (obj.tagName != 'A' && obj.tagName != 'BODY') { obj = obj.parentElement; if (obj.tagName == 'A' || obj.tagName == 'BODY') break; } if (obj.tagName == 'A' && obj.href != '') { act = 1; clrOrg = obj.style.color; TimerID = setInterval("ChangeColor()",100); } } } function stopRainbowAnchor() { if (Browser && act != 0) { if (obj.tagName == 'A') { obj.style.color = clrOrg; clearInterval(TimerID); act = 0; } } } function ChangeColor() { obj.style.color = makeColor(); } function makeColor() { if (elmS == 0) { elmR = elmV; elmG = elmV; elmB = elmV; } else { t1 = elmV; t2 = (255 - elmS) * elmV / 255; t3 = elmH % 60; t3 = (t1 - t2) * t3 / 60; if (elmH < 60) { elmR = t1; elmB = t2; elmG = t2 + t3; } else if (elmH < 120) { elmG = t1; elmB = t2; elmR = t1 - t3; } else if (elmH < 180) { elmG = t1; elmR = t2; elmB = t2 + t3; } else if (elmH < 240) { elmB = t1; elmR = t2; elmG = t1 - t3; } else if (elmH < 300) { elmB = t1; elmG = t2; elmR = t2 + t3; } else if (elmH < 360) { elmR = t1; elmG = t2; elmB = t1 - t3; } else { elmR = 0; elmG = 0; elmB = 0; } } elmR = Math.floor(elmR); elmG = Math.floor(elmG); elmB = Math.floor(elmB); clrRGB = '#' + elmR.toString(16) + elmG.toString(16) + elmB.toString(16); elmH = elmH + rate; if (elmH >= 360) elmH = 0; return clrRGB; } </script><div> <a href="##">鼠标移到这里观看效果</a> </div>