How to defer inline Javascript?
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<span>(楼主)</span>
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<span>2020-11-28 23:42</span>
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<h2>Defer/async script tags are not good enough</h2>
<p>There is a common knowledge that you should use <code><script src=".." async defer></code> (or set <code>script.async = true</code> before assigning <code>src</code>, when you do it from JS) and/or put your scripts at the very bottom of the page, so that as much as possible of the page gets loaded and rendered to the user, as fast as possible.</p>
<p>defer.js (note: <strong>I am the author of this script</strong>) is written in plain JavaScript, making lazy-loading other contents more fast and performant. You can defer any javascript files as well as inline script blocks efficiently.</p>
<p><img src="https://raw.githubusercontent.com/shinsenter/defer.js/master/docs/assets/defer-script.jpg" alt="Defer loading of JavaScript"></p>
<p>If your page is just an HTML page enhanced with some JavaScript, then you're good with just <code><script async></code>. It takes time for browser to parse and execute those scripts, and each UI change may reflow your layout, make your load speed more slow, no one likes staring at a blank white page; users are impatient and will leave quickly.</p>
<p>In various cases, using <code>async</code> or <code>defer</code> does not deliver faster page speed than defer.js does.</p>
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