


For example, 20111102
I was bored in the afternoon and wrote one. The code was not optimized.
I just wrote it out of boredom.
If anyone is interested in optimizing the code, thank you very much
After calculation, from 2000 to 3000 AD, there are a total of 36 qualifying days of perfect symmetry in the world.
When you see some blogs in the garden, you can add "run" below to directly execute the Html code. I don't know how to fix it, can someone tell me
<script> <BR>/**<BR>* Change the date into a standard 8-bit format, such as 20111102 <BR>* Divide it into four segments: 20 11 11 02 for the century, year, month, and day <BR>* The time complexity of the year-by-year algorithm is O(n3), and the final result can be obtained from the last four digits, month and day, which is more efficient<BR>* Because the mantissa of February in leap years is 9, which exceeds the long history of mankind, so there is no need to consider<BR>*/ <BR>;;(function(){ <BR>var theDateList=[]; <BR>//The maximum value of the century when a palindrome day occurs<BR>var maxForCentury=30; <BR>//The minimum value of the century when a palindrome day occurs<BR>var minForCentury=20; <BR>//The maximum value of the number of years when a palindrome day may occur, only rough processing is done here<BR>var maxForYear=21; <BR>var maxForDay=31;//Leap years are not excluded<BR>for(var i=1;i<=12;i ){ <BR>var stdYear,stdDay; <BR>var stdMonth=getStandardDate(i); <BR>/* <BR>if(getReverseDate(stdMonth)>maxForDay){ <BR>continue; <BR>} <BR>*/ <BR>maxForDay=getDate(i); <BR>for(var k=1 ;k<maxForDay;k ){ <BR>stdDay =getStandardDate(k); <BR>stdYear=getReverseDate(stdMonth stdDay); <BR>if(parseInt(getReverseDate(stdDay),10)>=minForCentury <BR> && parseInt(getReverseDate(stdDay),10)<maxForCentury) <BR>theDateList.push(stdYear stdMonth stdDay) <BR>} <BR>} <BR>theDateList.sort(); //Sort<BR>for( var i=0;i<theDateList.length;i ){ <BR>console.log(theDateList[i]); <BR>} <BR>console.log('Total %d records',theDateList.length) <BR>/**<BR>* Calculate the number of days in the current month according to the month <BR>* @param {int} val month <BR>* @return {int} <BR>*/ <BR>function getDate(val){ <BR>return val%2==0?30:31; <BR>} <BR>/**<BR>* Convert date values less than 10 to standard 8-digit date values <BR>* @param {int} val month or day <BR>* @return {string} standard format <BR>*/ <BR>function getStandardDate(val){ <BR>if(val<10){ <BR>return '0' val; <BR>} <BR>return val.toString(); <BR>} <BR>/ **<BR>* Reversed date <BR>* @param {string} date The standard format of the month or date <BR>* @return {string} The reversed standard format <BR>*/ <BR>function getReverseDate(date){ <BR>return date.split("").reverse().join(""); <BR>} <BR>})(); <BR></script>

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.

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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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JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.

The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.


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