


A very comprehensive javascript URL parsing function and segmented URL parsing method_javascript skills
一、URL解析函数
<script> <BR>/**<BR>*@param {string} url Complete URL address <BR>*@returns {object} Custom object <BR>*@description Usage example: var myURL = parseURL('http://abc.com: 8080/dir/index.html?id=255&m=hello#top'); <P>myURL.file='index.html' <br><br>myURL.hash= 'top' <br><br>myURL.host= 'abc.com' <br><br>myURL.query= '?id=255&m=hello' <br><br>myURL.params= Object = { id: 255, m: hello } <br><br>myURL.path= '/dir/index.html' <br> <br>myURL.segments= Array = ['dir', 'index.html'] <br><br>myURL.port= '8080' <br><br>myURL.protocol= 'http' <br><br>myURL.source= 'http://abc.com:8080/dir/index.html?id=255&m=hello#top' <br><br>*/ <BR>function parseURL(url) { <BR> var a = document.createElement('a'); <BR> a.href = url; <BR> return { <BR> source: url, <BR> protocol: a.protocol.replace(':',''), <BR> host: a.hostname, <BR> port: a.port, <BR> query: a.search, <BR> params: (function(){ <BR> var ret = {}, <BR> seg = a.search.replace(/^?/,'').split('&'), <BR> len = seg.length, i = 0, s; <BR> for (;i<len;i ) { <BR> if (!seg[i]) { continue; } <BR> s = seg[i].split('='); <BR> ret[s[0]] = s[1]; <BR> } <BR> return ret; <BR> })(), <BR> file: (a.pathname.match(//([^/?#] )$/i) || [,''])[1], <BR> hash: a.hash.replace('#',''), <BR> path: a.pathname.replace(/^([^/])/,'/$1'), <BR> relative: (a.href.match(/tps?://[^/] (. )/) || [,''])[1], <BR> segments: a.pathname.replace(/^//,'').split('/') <BR> }; <BR>} <br><br>//var myURL = parseURL('http://abc.com:8080/dir/index.html?id=255&m=hello#top'); <BR>var myURL = parseURL('http://localhost:8080/test/mytest/toLogina.ction?m=123&pid=abc'); <BR>alert(myURL.path); <BR>alert(myURL.params.m); <BR>alert(myURL.params.pid); <BR></script>
二、JS分段URL解析
URL : 统一资源定位符 (Uniform Resource Locator, URL)
完整的URL由这几个部分构成:scheme://host:port/path?query#fragment
scheme = 通信协议 (常用的http,ftp,maito等)
host = 主机 (域名或IP)
port = 端口号
path = 路径
query = 查询(可选,用于给动态网页(如使用CGI、ISAPI、PHP/JSP/ASP/ASP.NET等技术制作的网页)传递参数,可有多个参数,用”&”符号隔开,每个参数的名和值用”=”符号隔开。)
fragment = 信息片断(字符串,用于指定网络资源中的片断。例如一个网页中有多个名词解释,可使用fragment直接定位到某一名词解释。(也称为锚点.))
对于这样一个URL
http://www.jb51.net:80/seo/?ver=1.0&id=6#imhere
我们可以用javascript获得其中的各个部分
1, window.location.href
整个URl字符串(在浏览器中就是完整的地址栏)
2,window.location.protocol
URL 的协议部分
本例返回值:http:
3,window.location.host
URL 的主机部分
本例返回值:www.jb51.net
4,window.location.port
URL 的端口部分
如果采用默认的80端口(update:即使添加了:80),那么返回值并不是默认的80而是空字符
本例返回值:”"
5,window.location.pathname
URL 的路径部分(就是文件地址)
本例返回值:/seo/
6,window.location.search
查询(参数)部分
除了给动态语言赋值以外,我们同样可以给静态页面,并使用javascript来获得相信应的参数值
本例返回值:?ver=1.0&id=6
7,window.location.hash
锚点
本例返回值:#imhere

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing


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