JavaScript interview questions 1Scope:Topic 1: var v = 123; function foo() { var v = 456; function inner() { console.log(v) } return inner } result = foo(); console.log(result()) result: var v = 123; function foo() { var v = 456; function inner() { console.log(v) } return inner } result = foo(); //4

See answer in English > What does the JavaScript pseudo protocol actually do? 2 I don't write inline javascript, but I see and use it all the time in the codebase I use:<div onClick='javascript:alert("asdf");'></div>I did some testing and found that in all my browsers, even if IE is i

1. At 12:28:16 on October 20, 2019, learn HOW2J Javascript,2. The commonly seen abbreviation js means javascript;3. The javascript code must be placed in the script tag, the script tag can be placed anywhere in the html, it is generally recommended to be placed in the head tag.4. What is a piece of

I tried (but it doesn't work):Here is the tutorial I use for this purpose:Solution:Try this:When encountering issues like this, it's a good idea to check your browser for javascript errors. Different browsers display it differently, but look for a javascript console or something like that. Also, che

I am reading the HTML 5 Canvas animation tutorial using javascript (of course). In the title, the author used application/javascript which is very new to me because I have only seen used text/javascript. Can anyone help ? This question has probably been asked before, but I am using the phone to oper

https://www.cnblogs.com/haiyan123/p/7594046.htmlIn JavaScript, data types other than null and undefined are defined as objects, and variables can also be defined by creating objects. String, Math, Array, Date, and RegExp are all important built-in objects in JavaScript. In JavaScript programs Most f

Baidu Encyclopedia:  JavaScript is a scripting language belonging to the network, which has been widely used in Web application development. It is often used to add various dynamic functions to web pages and provide users with smoother and beautiful browsing effects. Usually JavaScript scr

I have seen some tutorials on how to create a JavaScript preloader for images. Is it possible to use the JavaScript preloader for other JavaScript?My website uses mootools (and others) for animations and lots of pictures etc.-so it takes a while to load. Is it possible that the website has a"load"in

JSON: JavaScript Object Notation JS Object NotationA lightweight data exchange format used to store and transmit data, usually used by the server to transfer data to web pagesIs an independent language, easy to understandJSON syntax rules:The data is a key/value pair, and a name corresponds to a value.Data separated by commaCurly braces hold objects, square brackets hold array key-value pairsExample: JSON syntax defines the employees object{"employees":[ {"firstName":"John", "lastName":"Doe"},

forewordThis article is 2925 words, and it takes about 10 minutes to read.Summary: This article sorts out the difference between asynchronous code and synchronous code execution, Javascript's event loop, task queue, micro-task queue and other concepts.Original address: Understanding Asynchronous Jav