打开页面时随机跳出一个提示信息窗口
<SCRIPT LANGUAGE="JavaScript">
function generateRandomNumber() {
var tempString = ""
tempString += Math.random() * 100000
return tempString.substring(2,3)
}
config='toolbar=no,location=no,directories=no,status=no,menubar=no,width=300,height=150'
config += 'scrollbars=no,resizable=no'
output = window.open ("","outputwindow",config)
output.document.write('<title>Random Useless Fact</title>');
output.document.write('<BODY bgcolor=#000066 text=#cccccc>');
output.document.write('<center><big>Random Useless Fact:</big>');
output.document.write('<hr><br><p>');
if (generateRandomNumber()=="1")
{output.document.write('Each year more people in the United States are killed from the bite of a poisonous snake than the bite of a non-poisonous one.');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="2")
{output.document.write('Each year more women in the Unites States get pregnant than men.');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="3")
{output.document.write('Flourine (Fl) is the most active metal.');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="4")
{output.document.write('Marilyn Manson (a.k.a. Brian Warner) was born in 1969.');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="5")
{output.document.write('I have not entered this fact yet. Please try again. <' + generateRandomNumber());
output.document.write('>');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="6")
{output.document.write('I have not entered this fact yet. Please try again. <' + generateRandomNumber());
output.document.write('>');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="7")
{output.document.write('I have not entered this fact yet. Please try again. <' + generateRandomNumber());
output.document.write('>');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="8")
{output.document.write('I have not entered this fact yet. Please try again. <' + generateRandomNumber());
output.document.write('>');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="9")
{output.document.write('I have not entered this fact yet. Please try again. <' + generateRandomNumber());
output.document.write('>');
output.document.write('<br><br><br><br><br><br>')}
if (generateRandomNumber()=="0")
{output.document.write('I have not entered this fact yet. Please try again. <' + generateRandomNumber());
output.document.write('>');
output.document.write('<br><br><br><br><br><br>');}
else
{output.document.write('Tungstun (W) has the highest melting point of all metals. That is why it is used in light bulbs.');
output.document.write('<br><br><br><br><br><br>')}
</SCRIPT>