Short & Snazzy: A unary operator like plus triggers the valueOf method in the Date object and it returns the timestamp (without any alteration). Details: On almost all current browsers you can use Date.now() to get the UTC timestamp in milliseconds; a notable exception to this is IE8 and earlier (see compatibility table). You can … Read more
If your are using express above 2.x, you have to declare app.router like below code. Please try to replace your code with Please click here to get more details about app.router Note: app.router is depreciated in express 3.0+. If you are using express 3.0+, refer to Anirudh’s answer below.
If you don’t want to mess with HTML elements: Show code snippet This uses the HTMLAudioElement interface, which plays audio the same way as the <audio> element. If you need more functionality, I used the howler.js library and found it simple and useful. Show code snippet
The res object in Express is a subclass of Node.js’s http.ServerResponse (read the http.js source). You are allowed to call res.setHeader(name, value) as often as you want until you call res.writeHead(statusCode). After writeHead, the headers are baked in and you can only call res.write(data), and finally res.end(data). The error “Error: Can’t set headers after they are sent.” means that you’re already in the Body or Finished … Read more
When do they fire? window.onload By default, it is fired when the entire page loads, including its content (images, CSS, scripts, etc.). In some browsers it now takes over the role of document.onload and fires when the DOM is ready as well. document.onload It is called when the DOM is ready which can be prior to images and other external content … Read more
This is because require() does not exist in the browser/client-side JavaScript. Now you’re going to have to make some choices about your client-side JavaScript script management. You have three options: Use the <script> tag. Use a CommonJS implementation. It has synchronous dependencies like Node.js Use an asynchronous module definition (AMD) implementation. CommonJS client side-implementations include (most of them require a build step before you … Read more
In the terminal, you are running the node application and it is running your script. That is a very different execution environment than directly running your script in the browser. While the Javascript language is largely the same (both V8 if you’re running the Chrome browser), the rest of the execution environment such as libraries … Read more
I’m wondering if it’s possible to sandbox JavaScript running in the browser to prevent access to features that are normally available to JavaScript code running in an HTML page. For example, let’s say I want to provide a JavaScript API for end users to let them define event handlers to be run when “interesting events” … Read more
You could use Javascript:
You get the error because order[1] is undefined. That error message means that somewhere in your code, an attempt is being made to access a property with some name (here it’s “push”), but instead of an object, the base for the reference is actually undefined. Thus, to find the problem, you’d look for code that … Read more