本文實例講述了JavaScript實現彩虹文字效果的方法。分享給大家供大家參考。具體如下：
<HTML><HEAD><TITLE>Rainbow Text</TITLE><SCRIPT LANGUAGE="JavaScript"><!-- Begin hide from old browsersfunction createHexArray(n){ this.length = n; for (var i = 1; i <= n; i++) this[i] = i - 1; this[11] = "A"; this[12] = "B"; this[13] = "C"; this[14] = "D"; this[15] = "E"; this[16] = "F"; return this;}hx = new createHexArray(16);function convertToHex(x){ if (x < 17) x = 16; var high = x / 16; var s = high+""; s = s.substring(0, 2); high = parseInt(s, 10); var left = hx[high + 1]; var low = x - high * 16; if (low < 1) low = 1; s = low + ""; s = s.substring(0, 2); low = parseInt(s, 10); var right = hx[low + 1]; var string = left + "" + right; return string;}function makeRainbow(text){ text = text.substring(0, text.length); color_d1 = 255; mul = color_d1 / text.length; for(var i = 0; i < text.length; i++) { color_d1 = 255*Math.sin(i / (text.length / 3)); color_h1 = convertToHex(color_d1); color_d2 = mul * i; color_h2 = convertToHex(color_d2); k = text.length; j = k - i; if (j < 0) j = 0; color_d3 = mul * j; color_h3 = convertToHex(color_d3); document.write("<FONT COLOR=/"#" + color_h3 + color_h1 + color_h2 + "/">" + text.substring(i, i + 1) + "</FONT>"); }}// End hide from old browsers --></script></HEAD><body bgcolor="#FFFFCC"><center><strong><font size=6><script><!--// change to your own text ...makeRainbow("Welcome to Boulder City Nevada");document.write("<br>");makeRainbow("The best dam city in the USA");// --></script></font></strong></center></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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