SetInterval make Web site stay time

Today I want to give you how to use SetInterval to make Web stay time. The effect of the following figure

I used a div plus a span tag to show

First you have to add a style

　　

Style to control the appearance of the Div box

And then there's the JavaScript code.

As shown in the picture above, why the code does not replicate to everyone, is to let everyone come to play themselves, so conducive to memory.

here var a = setinterval (h,1000);

Parameter description:

H is the function to run

1000 is the time of the run, the function is run once every few milliseconds.