


How to use the A tag to get the absolute path of the current directory in Javascript_javascript tips
When it comes to path-related issues, everyone will think of window.location. Indeed, this object provides quite a lot of path information, among which the commonly used ones include:
1.location.href: The complete URL of the current page
2.location.pathname: The path name in the current URL
3.location.hash: Anchor point
in the current URL
4.location.search: query parameters in the current URL
However, location does not have an attribute that can directly obtain the absolute path of the current directory (excluding the file name). Through Google, I found some wrong methods, such as separating the URL into an array through "/", removing the last item of the array and then concatenating it into a string. But if the file name is not specified in the URL, the result is completely wrong.
Based on past coding experience, the href attribute of the a element will always return an absolute path, which means it has the ability to convert relative paths into absolute paths. I tried it using the following code, and it worked:
var a = document.createElement('a');
a.href = './';
alert(a.href);
a = null;
Unfortunately, this method is not valid under the old IE 6/7. When alert(a.href) is executed, "./" still pops up. Later, I found that someone had also asked this question on Stackoverflow, and the solution was very simple. Just inject a through innerHTML:
var div = document.createElement('div');
div.innerHTML = '";
alert(div.firstChild.href);
div = null;
Someone may ask: Why not use regular expressions? My answer is: You need to consider whether there is a file name, whether there is an anchor point, and whether there are query parameters. This regular expression may be quite complicated.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.


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