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    <p>The first form that you list works, since it will evaluate a string at the end of <code>delay</code>. Using <code>eval()</code> is generally not a good idea, so you should avoid this.</p> <p>The second method doesn't work, since you immediately execute a function object with <strong><a href="http://docstore.mik.ua/orelly/webprog/jscript/ch05_10.htm" rel="noreferrer">the function call operator <code>()</code></a></strong>. What ends up happening is that <code>playNote</code> is executed immediately if you use the form <code>playNote(...)</code>, so nothing will happen at the end of the delay.</p> <p>Instead, you have to pass an anonymous function to setTimeout, so the correct form is:</p> <pre><code>setTimeout(function() { playNote(currentaudio.id,noteTime) }, delay); </code></pre> <p>Note that you are passing <code>setTimeout</code> an entire function expression, so it will hold on to the anonymous function and only execute it at the end of the delay.</p> <p>You can also pass <code>setTimeout</code> a reference, since a reference isn't executed immediately, but then you can't pass arguments:</p> <pre><code>setTimeout(playNote, delay); </code></pre> <hr> <p><strong>Note:</strong></p> <p>For repeated events you can use <strong><a href="https://developer.mozilla.org/en/DOM/window.setInterval" rel="noreferrer"><code>setInterval()</code></a></strong> and you can set <code>setInterval()</code> to a variable and use the variable to stop the interval with <strong><a href="https://developer.mozilla.org/en/DOM/window.clearInterval" rel="noreferrer"><code>clearInterval()</code></a></strong>.</p> <p>You say you use <code>setTimeout()</code> in a <code>for</code> loop. In many situations, it is better to use <code>setTimeout()</code> in a recursive function. This is because in a <code>for</code> loop, the variables used in the <code>setTimeout()</code> will not be the variables as they were when <code>setTimeout()</code> began, but the variables as they are after the delay when the function is fired.</p> <p>Just use a recursive function to sidestep this entire problem.</p> <h2>Using recursion to deal with variable delay times:</h2> <pre><code> // Set original delay var delay = 500; // Call the function for the first time, to begin the recursion. playNote(xxx, yyy); // The recursive function function playNote(theId, theTime) { // Do whatever has to be done // ... // Have the function call itself again after a delay, if necessary // you can modify the arguments that you use here. As an // example I add 20 to theTime each time. You can also modify // the delay. I add 1/2 a second to the delay each time as an example. // You can use a condition to continue or stop the recursion delay += 500; if (condition) { setTimeout(function() { playNote(theID, theTime + 20) }, delay); } } </code></pre>
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