<script type="text/javascript"> <!-- Begin /* * Notes on hue * * This script uses hue rotation in the following manner: * hue=0 is red (#FF0000) * hue=60 is yellow (#FFFF00) * hue=120 is green (#00FF00) * hue=180 is cyan (#00FFFF) * hue=240 is blue (#0000FF) * hue=300 is magenta (#FF00FF) * hue=360 is hue=0 (#FF0000) * * Notes on the script * * This script should function in any browser that supports document.getElementById * It has been tested in Netscape7, Mozilla Firefox 1.0, and Internet Explorer 6 * * Accessibility * * The script does not write the string out, but rather takes it from an existing * HTML element. Therefore, users with javascript disabled will not be adverely affected. * They just won't get the pretty colors. */ /* * splits par.firstChild.data into 1 span for each letter * ARGUMENTS * span - HTML element containing a text node as the only element */ function toSpans(span) { var str=span.firstChild.data; var a=str.length; span.removeChild(span.firstChild); for(var i=0; i<a; i++) { var theSpan=document.createElement("SPAN"); theSpan.appendChild(document.createTextNode(str.charAt(i))); span.appendChild(theSpan); } } /* * creates a rainbowspan object * whose letters will be colored [deg] degrees of hue * ARGUMENTS * span - HTML element to apply the effect to (text only, no HTML) * hue - what degree of hue to start at (0-359) * deg - how many hue degrees should be traversed from beginning to end of the string (360 => once around, 720 => twice, etc) * brt - brightness (0-255, 0 => black, 255 => full color) * spd - how many ms between moveRainbow calls (less => faster) * hspd - how many hue degrees to move every time moveRainbow is called (0-359, closer to 180 => faster) */ function RainbowSpan(span, hue, deg, brt, spd, hspd) { this.deg=(deg==null?360:Math.abs(deg)); this.hue=(hue==null?0:Math.abs(hue)%360); this.hspd=(hspd==null?3:Math.abs(hspd)%360); this.length=span.firstChild.data.length; this.span=span; this.speed=(spd==null?50:Math.abs(spd)); this.hInc=this.deg/this.length; this.brt=(brt==null?255:Math.abs(brt)%256); this.timer=null; toSpans(span); this.moveRainbow(); } /* * sets the colors of the children of [this] as a hue-rotating rainbow starting at this.hue; * requires something to manage ch externally * I had to make the RainbowSpan class because M$IE wouldn't let me attach this prototype to [Object] */ RainbowSpan.prototype.moveRainbow = function() { if(this.hue>359) this.hue-=360; var color; var b=this.brt; var a=this.length; var h=this.hue; for(var i=0; i<a; i++) { if(h>359) h-=360; if(h<60) { color=Math.floor(((h)/60)*b); red=b;grn=color;blu=0; } else if(h<120) { color=Math.floor(((h-60)/60)*b); red=b-color;grn=b;blu=0; } else if(h<180) { color=Math.floor(((h-120)/60)*b); red=0;grn=b;blu=color; } else if(h<240) { color=Math.floor(((h-180)/60)*b); red=0;grn=b-color;blu=b; } else if(h<300) { color=Math.floor(((h-240)/60)*b); red=color;grn=0;blu=b; } else { color=Math.floor(((h-300)/60)*b); red=b;grn=0;blu=b-color; } h+=this.hInc; this.span.childNodes[i].style.color="rgb("+red+", "+grn+", "+blu+")"; } this.hue+=this.hspd; } // End --> </script>

<h3 id="r1">ใส่ข้อความของคุณที่นี่ครับ</h3> <script type="text/javascript"> var r1=document.getElementById("r1"); //get span to apply rainbow var myRainbowSpan=new RainbowSpan(r1, 0, 360, 255, 50, 18); //apply static rainbow effect myRainbowSpan.timer=window.setInterval("myRainbowSpan.moveRainbow()", myRainbowSpan.speed); </script>