If there’s any code below loadScript(…), it doesn’t wait until the script loading finishes. “asynchronously”, as it starts loading now, but runs later, when the function has already finished. load and execute the script at the given path The browser automatically starts loading it and executes when complete. ![]() It inserts into the document a new, dynamically created, tag with the given src. Let script = document.createElement('script') this causes the script with given src to start loading and run when complete creates a tag and append it to the page Take a look at the function loadScript(src), that loads a script with the given src: There are other real-world examples of asynchronous actions, e.g. In other words, actions that we initiate now, but they finish later.įor instance, one such function is the setTimeout function. Many functions are provided by JavaScript host environments that allow you to schedule asynchronous actions. There won’t be anything really complex browser-wise. If you’re not familiar with these methods, and their usage in the examples is confusing, you may want to read a few chapters from the next partĪlthough, we’ll try to make things clear anyway. ![]() To demonstrate the use of callbacks, promises and other abstract concepts, we’ll be using some browser methods: specifically, loading scripts and performing simple document manipulations.
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