


How to solve the problem of referer compatibility with major browsers under js_javascript skills
HTTP Header referer mainly tells people where I come from, that is, which page I come from. It can be used to count the source of users who visit this website, and can also be used to prevent hot links. The best way to obtain this thing is js. If you obtain it on the server side (PHP method such as: $_SERVER['HTTP_REFERER']), it is unreliable. People can forge it. It is best to use js. It is difficult for people to forge it.
Method: Use the document.referer method of js to accurately determine the true origin of the web page. Currently, Baidu statistics, Google ads statistics, and CNZZ statistics all use this method. Anti-hotlinking is also very simple. If the source URL is judged in js and it is not from this site, the picture will not be displayed.
As we all know, we web developers hate IE because IE does not support standards and its default behavior outside of standards is often inconsistent with other browsers:
Use javascript to make a jump in IE, for example, use window.location.href = ""; If Google uses document.referrer, it cannot get the HTTP referrer requested by the browser because IE has cleared it
The other mainstream browsers Firefox and Chrome will retain the referrer. There is no way, this means that IE will enjoy "ministerial" special treatment again:
The following code can solve this problem in IE:
//Detect if it is an IE browser, then manually add a referer
The principle is to secretly add a link to the IE browser page, and then automatically click on the link, so the referrer can be retained.
var url = 'http://www.jb51.net';
if (/MSIE (d .d );/.test(navigator.userAgent) || /MSIE(d .d );/.test(navigator.userAgent))
{
var referLink = document.createElement('a');
referLink.href = url;
Document.body.appendChild(referLink);
referLink.click();
}
else
{
Location.href = url;
}

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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