Using random numbers to create special effects on JavaScript web pages_Typical special effects

The online world is extremely exciting, and if special effects are used appropriately, the gorgeous pages will be even more beautiful. Here are the special effects I summarized:
Jumping text
Want to see dancing text? bring it on!
Code: First add 〈script language="JavaScript"〉 between 〈head〉 and 〈/head〉
　〈!--
　function font11()
　//Define function font11()
　{
　document.all.a1.style.fontSize=16
　Math.floor(Math.random()*24); //Call the Math.random() function to generate a random number and then use it The Math.floor() function generates the next number less than or equal to Math.random()*24 to change the text size
　 c1=Math.floor(Math.random()*256);
c2=Math .floor(Math.random()*256);
c3=Math.floor(Math.random()*256);
document.all.a1.style.color="rgb(" c1 ", " c2 "," c3 ")"; //Same as above, change the text color (using RGB color adjustment)
timer=setTimeout('font11()',200); //Call the font11() function every 200 milliseconds
　}
　---〉〈/script〉
　Add onLoad="font11();" in

and finally add where needed Fly〈/span〉
Features: Text color and size can be changed randomly.
Extension: Multiple sets of codes can be added to the web page, in which font11 represents different text. In the future, it will be font12, font13, etc. The text can be represented as different.
The picture fades in and out
As time goes by, the picture also changes from blur to clear in a cycle.
Code: First add 〈script language="JavaScript"〉 between 〈head〉 and 〈/head〉
〈!--
mark=0;
function tupian() //Create Function tupian()
　{
　if(photo.filters.alpha.opacity〈10)
　//When the image transparency is less than 10
　mark=1;
　if(photo.filters. alpha.opacity〉98)
//When the image transparency is greater than 98
mark=-1;
step=2*mark;
photo.filters.alpha.opacity =step;
//Transparent value counter accumulates
setTimeout('tupian()',20);
//The program is executed every 20 milliseconds
}
---〉〈/script〉
Then add id="photo" and style="filter:alpha(opacity=0;)" to the image attributes
Finally, add 〈script〉〈!--
tupian() after the image code ;
　---〉〈/script〉
Features: Pictures cycle and fade in and out.
The codes in this article are very simple, and I have explained everything that needs explanation.