当用户去触发点击这个dom元素的时候,会激活这个函数,这个click不会马上压入stack中,也会需要进入callbackQueue中排队执行,当stack中事件执行完为空的时候,event loop 会把click压入栈中,接着console.log('test2');有意思的是你点击了多少次该元素,就会有多少个click在那里排队等待召唤,很神奇,就像下面这张图这样, 最后
A callback function in JavaScript is a function that is passed as an argument to another function and is invoked after some kind of event.
Here's a fun project attempting to explain what exactly is happening under the hood for some counter-intuitive snippets and lesser-known features in Python.While some of the examples you see below may not be WTFs in the truest sense, but they'll reveal some of the interesting parts of ...
Node.js is an open-source JavaScript runtime environment that allows developers to execute JavaScript code for server-side scripting and scalable network applications.
“This functionality being in the language is a really nice convenience for projects that are trying not to have a large set of dependencies while still having access to these really common things,” Claymore agreed. “They’re not the hardest things to write by hand, but it’s no fun rew...
In general, 3xx codes serve to instruct web servers what additional action is needed for the request’s completion. There are several main types of redirects, and each type plays a unique role. We’ll also touch on the less common but still noteworthy meta refresh and JavaScript redirects, ...
“Prefetch speculatively” means that, when a CPU sees an if clause (a condition) or a for/while block (a loop), it will try and guess what will happen, and in the process fetch data it speculates it will need. It is likely every Intel CPU post the Pentium Pro are affected. Atom...
This one is pretty straightforward for me:Object.entries()withfor...of. Having a dedicated variable for theitemin the loop is really nice. Was this helpful?AGo Make Things Membershipis the best way to help me create even more free web developer content. ...
A for loop is a programming construct that allows a block of code to be executed repeatedly until a certain condition is met.
Notice the significant difference between unit and integration tests:A unit test verifies the behavior of small part of the application, isolated from the environment and other parts, and is quite easy to implement, while an integration test covers interactions between different components, in the cl...