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    <p>Your loop is fine (other than that you don't declare <code>i</code>, and so you fall prey to the <a href="http://blog.niftysnippets.org/2008/03/horror-of-implicit-globals.html" rel="nofollow">Horror of Implicit Globals</a>), it's <a href="https://developer.mozilla.org/en/document.write" rel="nofollow"><code>document.write</code></a> that's the problem. You can only use <code>document.write</code> in an inline script, not after the page has been loaded (e.g., not in the <code>body</code> <code>load</code> event). If you use <code>document.write</code> after the page is loaded, it tears down the page and <em>replaces</em> it with what you output (because there's an implicit <a href="https://developer.mozilla.org/en/DOM/document.open" rel="nofollow"><code>document.open</code></a> call). So in your case, your page disappears and 150 blank divs are there instead.</p> <p>To manipulate the page after load, you'll want to use the DOM, references:</p> <ul> <li><a href="http://www.w3.org/TR/DOM-Level-2-Core/" rel="nofollow">DOM2 Core</a> - Widely supported by browsers</li> <li><a href="http://www.w3.org/TR/DOM-Level-2-HTML/" rel="nofollow">DOM HTML bindings</a> - Widely suppored by browsers</li> <li><a href="http://www.w3.org/TR/DOM-Level-3-Core/" rel="nofollow">DOM3 Core</a> - Fairly well supported, some gaps</li> </ul> <p>For instance, here's how you'd write your <code>generate</code> function to append 150 blank divs to the page:</p> <pre><code>function generate() { var i; for (i = 0; i &lt; 150; i++){ document.body.appendChild(document.createElement('div')); } } </code></pre> <p>Or more usefully, 150 divs with their numbers in:</p> <pre><code>function generate() { var i, div; for (i = 0; i &lt; 150; i++){ div = document.createElement('div'); div.innerHTML = "I'm div #" + i; document.body.appendChild(div); } } </code></pre> <p><a href="http://jsbin.com/ahawum" rel="nofollow">Live copy</a></p> <hr> <p>Separately, if you're going to do any significant DOM manipulation, it's well worth using a good JavaScript browser library like <a href="http://jquery.com" rel="nofollow">jQuery</a>, <a href="http://prototypejs.org" rel="nofollow">Prototype</a>, <a href="http://developer.yahoo.com/yui/" rel="nofollow">YUI</a>, <a href="http://code.google.com/closure/library" rel="nofollow">Closure</a>, or <a href="http://en.wikipedia.org/wiki/List_of_JavaScript_libraries" rel="nofollow">any of several others</a>. These smooth over browser differences (and outright bugs), provide useful utility functions, and generally let you concentrate on what you're actually trying to do rather than fiddling about with inconsistencies between IE and Chrome, Opera and Safari...</p>
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    1. COThanks! I'm thinking of making a simple roguelike to learn Javascript, so I try to do it without relying on any libraries.
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    2. CO@Leventhan: I'm not sure what a "roguelike" is, but good luck! The things to learn are: JavaScript itself, and then the things you can do with it in your target environemnt(s). In the browser, that means using the DOM (or a library that does that for you). The DOM is an API to the browser, not part of JavaScript itself. If you're doing browser work, it's definitely good to have some idea of how the DOM works, even if you do end up (later) using a library that abstracts some of the hassles away for you.
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