不错的文字特效，逐字变色效果

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<font color="#669900" style="font-weight:bolder;letter-spacing: 2px;"><script language="JavaScript">
text = "www.phpstudy.net";
color1 = "green";
color2 = "red";
speed = 200;
i = 0;
if (navigator.appName == "Netscape") {
}
else {
document.write("<span id=a></span>");
}
function changeCharColor() {
if (navigator.appName == "Netscape") {
document.a.document.write("<font color=" + color1 + ">");
for (var j = 0; j < text.length; j++) {
if(j == i) {
document.a.document.write("<font color=" + color2 + ">" + Text.charAt(i) + "</font>");
}
else {
document.a.document.write(text.charAt(j));
}
}
document.a.document.write('</font>');
document.a.document.close();
}
if (navigator.appName == "Microsoft Internet Explorer") {
str = "<font color=" + color1 + ">";
for (var j = 0; j < text.length; j++) {
if( j == i) {
str += "<font color=" + color2 + ">" + text.charAt(i) + "</font>";
}
else {
str += text.charAt(j);
}
}
str += "</font>";
a.innerHTML = str;
}
(i == text.length) ? i=0 : i++;
}
setInterval("changeCharColor()", speed);
// End -->
</script>
</font>
运行效果

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