How to achieve random display of advertisements on Javascript static pages

First, you need to generate random numbers not repeated within n, and put the generated random numbers into another Array. Use the following method to complete the process:
Copy codeThe Code is as follows:
Function getRandomNumbers (count)
{
Var numbers = new Array ();
Var original = new Array ();
For (var I = 0; I <count; I ++)
{
Original [I] = I + 1;
}
Original. sort (function () {return 0.5-Math. random ();});
For (var I = 0; I <count; I ++)
{
Numbers [I] = original [I]-1;
}
Return numbers;
}

Then, in the background program, output the html Script:
Copy codeThe Code is as follows:
Var sf = new Array ();
Sf [0] = '<tr> <TD width = 120> <a href = # target = _ blank> server name </a> </TD> <TD width = 110> <a href = http:// SC .jb51.net target = _ blank> Server IP </a> </TD> <TD width = 160> opening time </TD> <TD align = center width = 95> line Category </TD> <TD> Version introduction </TD> <TD width = 105> customer service QQ </TD> <TD align = center width = 55> <a href = # target = _ blank> <font color = #000000> detailed introduction </font> </a> </TD> </tr> ';
Sf [1] = '<tr> <TD width = 120> <a href = # target = _ blank> server name </a> </TD> <TD width = 110> <a href = http://s.jb51.net target = _ blank> Server IP </a> </TD> <TD width = 160> opening time </TD> <TD align = center width = 95> line Category </TD> <TD> Version introduction </TD> <TD width = 105> customer service QQ </TD> <TD align = center width = 55> <a href = # target = _ blank> <font color = #000000> detailed introduction </font> </a> </TD> </tr> ';

Use the previous method to generate a random number and display the html Script according to the random number.
Copy codeThe Code is as follows:
Var numbers = getRandomNumbers (sf. length );
For (I = 0; I <numbers. length; I ++)
{
Document. write (sf [numbers [I]);
}