本文介绍了一段使用JavaScript实现的网页特效代码，包括彩虹色文字效果和字体大小变化效果，并展示了如何通过JavaScript获取用户的浏览器信息，如浏览器名称、版本号等。
<html>
<head>
<script language="JavaScript">
<!--
function makeArray(n){
this.length=n;
return this;
}
function hexfromdec(num) {
hex=new makeArray(1);
var hexstring="";
var shifthex=16;
var temp1=num;
for(x=1; x>=0; x--) {
hex[x]=Math.round(temp1/shifthex - .5);
hex[x-1]=temp1 - hex[x] * shifthex;
temp1=hex[x-1];
shifthex /= 16;
}
for (x=1; x>=0; x--) {
hexstring+=getletter(hex[x]);
}
return (hexstring);
}
function getletter(num) {
if (num < 10) {
return num;
}
else {
if (num == 10) {
return "A"
}
if (num == 11) {
return "B"
}
if (num == 12) {
return "C"
}
if (num == 13) {
return "D"
}
if (num == 14) {
return "E"
}
if (num == 15) {
return "F"
}
}
}
function rainbow(text){
var color_d1;
var allstring="";
for(i=0;i<text.length;i=i+2){
color_d1=255*Math.sin(i/(text.length/3));
color_h1=hexfromdec(color_d1);
allstring+="<FONT COLOR="+color_h1+"ff"+color_h1+">"+text.substring(i,i+2)+"</FONT>";
}
return allstring;
}
function sizefont(text){
var color_d1;
var allstring="";
var flag=0;
for(i=0,j=0;i<text.length;i=i+1){
if (flag==0) {
j++;
if (j>=7) {
flag=1;
}
}
if (flag==1) {
j=j-1;
if (j<=0) {
flag=0;
}
}
allstring+="<FONT SIZE="+ j + ">" + text.substring(i,i+1) + "</FONT>";
}
return allstring;
}
document.write("<font size=8><CENTER>",rainbow('标题上面的字体啊'));
document.write("<BR><BR>");
document.write( sizefont("这是一个获取WEB浏览器的程序"));
document.write("</CENTER></font>");
document.write("浏览器名称: "+navigator.appName+"<br>");
document.write("版本号: "+navigator.appVersion+"<br>");
document.write("代码名字: "+navigator.appCodeName+"<br>");
document.write("用户代理标识: "+navigator.userAgent);
// -->
</script>
<body>
</body>
</html>
<head>
<script language="JavaScript">
<!--
function makeArray(n){
this.length=n;
return this;
}
function hexfromdec(num) {
hex=new makeArray(1);
var hexstring="";
var shifthex=16;
var temp1=num;
for(x=1; x>=0; x--) {
hex[x]=Math.round(temp1/shifthex - .5);
hex[x-1]=temp1 - hex[x] * shifthex;
temp1=hex[x-1];
shifthex /= 16;
}
for (x=1; x>=0; x--) {
hexstring+=getletter(hex[x]);
}
return (hexstring);
}
function getletter(num) {
if (num < 10) {
return num;
}
else {
if (num == 10) {
return "A"
}
if (num == 11) {
return "B"
}
if (num == 12) {
return "C"
}
if (num == 13) {
return "D"
}
if (num == 14) {
return "E"
}
if (num == 15) {
return "F"
}
}
}
function rainbow(text){
var color_d1;
var allstring="";
for(i=0;i<text.length;i=i+2){
color_d1=255*Math.sin(i/(text.length/3));
color_h1=hexfromdec(color_d1);
allstring+="<FONT COLOR="+color_h1+"ff"+color_h1+">"+text.substring(i,i+2)+"</FONT>";
}
return allstring;
}
function sizefont(text){
var color_d1;
var allstring="";
var flag=0;
for(i=0,j=0;i<text.length;i=i+1){
if (flag==0) {
j++;
if (j>=7) {
flag=1;
}
}
if (flag==1) {
j=j-1;
if (j<=0) {
flag=0;
}
}
allstring+="<FONT SIZE="+ j + ">" + text.substring(i,i+1) + "</FONT>";
}
return allstring;
}
document.write("<font size=8><CENTER>",rainbow('标题上面的字体啊'));
document.write("<BR><BR>");
document.write( sizefont("这是一个获取WEB浏览器的程序"));
document.write("</CENTER></font>");
document.write("浏览器名称: "+navigator.appName+"<br>");
document.write("版本号: "+navigator.appVersion+"<br>");
document.write("代码名字: "+navigator.appCodeName+"<br>");
document.write("用户代理标识: "+navigator.userAgent);
// -->
</script>
<body>
</body>
</html>
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