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    <p>You'll note that your code is using <a href="https://developer.mozilla.org/en-US/docs/Web/API/window.setInterval" rel="nofollow"><code>setInterval()</code></a>. This global JavaScript function is used for periodically executing code at a given time interval. It takes two arguments for its typical usage (which is the way you are using it here). It returns a unique ID that can be used to identify your particular interval function (since multiple ones can be set up simultaneously).</p> <p>The first argument is a function to be executed on the interval. Your function is the anonymous function:</p> <pre><code>function() { value = ((+value) + .1).toFixed(1); if (value == 80.5) clearInterval(interval); $('p').html(value + '%'); } </code></pre> <p>This function will increase the percentage progress on each execution.</p> <p>The second argument is an integer number for the number of milliseconds (thousandths of a second) to let elapse before the function from the first argument is executed. This is the key part for your question, I believe. Your code has <code>2</code> (on the last line of your posted code), so it will wait 2 milliseconds before executing your function (which increments the percentage progress), and then it will wait 2 more milliseconds, then execute the same function again, etc.</p> <p>By simply changing the value of the second argument, you can change how fast or slow your function executes each time, which changes how fast or slow your percentage increases. So if you set it to <code>500</code>, then <code>setInterval</code> will wait for a half a second before each execution of the function.</p> <p>You can read about the other JavaScript timer functions <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Timers" rel="nofollow">here</a>, in particular about <a href="https://developer.mozilla.org/en-US/docs/Web/API/window.clearInterval" rel="nofollow"><code>clearInterval()</code></a>, which your code uses in the anonymous function to end the interval when you reach <code>80.5%</code>.</p>
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    1. POJavaScript: how to control progress speed?
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    1. CO@ajp14243 the best way is use `jQuery` or any other `JavaScript` isn't ?
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    2. COIf you want to increase or decrease the percentage progression, just change the `2` that's on your last line of posted code to match the number of milliseconds you want between each update to the percentage value. You shouldn't need to make any other changes if your goal is to increment a percentage count up to `80.5%` and then stop.
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    3. COthanks for your help Unfortunately `2` speed not enough sometimes :(, do you have any other function for me
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