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Detailed explanation and implementation code of judging palindrome number in javascript

高洛峰Original: 2017-02-03 13:49:261469browse

javascriptJudge the number of palindromes

Summary:

Palindrome refers to a sentence that can be read both forward and backward. It is a rhetorical method and text that has been used in ancient and modern times, both at home and abroad. Games, such as "I am for everyone, everyone is for me", etc. In mathematics, there is also a type of number with such characteristics, called palindrome number (palindrome number) Let n be. An arbitrary natural number. If the natural number n1 obtained by reversing the digits of n is equal to n, then n is called a palindrome number. For example, if n=1234321, n is called a palindrome number; but if n=1234567. , then n is not a palindrome number

Note:

1. Even numbers also have palindrome numbers 124421
2. There are no palindrome numbers for decimals

Implementation code:

<html> 
  <head> 
    <meta http-equiv="Content-Type" content="text/html;charset=gb2312"/> 
    <title>test</title> 
    <script type="text/javascript"> 
      var number = parseInt(window.prompt("输入回文数")); 
      if(daozhi(number) == number) { 
        document.writeln(number + "是回文数"); 
      } else { 
        document.writeln(number + "不是回文数");  
      } 
        
      /*整数的倒置*/
      function daozhi(num) { 
        var newNumber = 0; 
          
        while(num != 0) { 
          newNumber *= 10; 
          newNumber =newNumber + (num % 10); 
          num = Math.floor(num/10); 
        } 
          
        return newNumber; 
      } 
        
    </script> 
  </head> 
  <body> 
  </body> 
</html>

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