How to use js to find the longest palindrome string in a string-JS Tutorial-php.cn

How to use js to find the longest palindrome string in a string

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Release： 2018-06-05 09:44:27

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This time I will show you how to operate js to find the longest palindrome string in string, and how to operate js to find the longest palindrome string in a stringNotes What are they? Here are actual cases. Let’s take a look.

<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <title>回文</title>
 <link rel="stylesheet" href="">
</head>
<body>
 <script type="text/javascript">
  function longestPalindrome(str){
   let palindromeStr=""; //记录最长回文串
   let tempPalindrome=""; //记录当前回文串
   for(let i=0;i<str.length;i++){ //i记录当前遍历字符串的开始位置，循环依次向后遍历
    tempPalindrome=""; //每次新的一轮开始时，将临时记录回文串的变量清空
    for(let j=i;j<str.length;j++){ //每次开始循环是以当前i所在的下标位置为开始遍历字符串的起始位置，直到遍历到结束位置
     tempPalindrome+=str.charAt(j); //逐个增加字符串的长度
     if(isPalindrome(tempPalindrome) && tempPalindrome.length>palindromeStr.length){   //将当前的字符串传入isPalindrome进行回文判断，如果是回文串，则判断当前回文串长度是否大于之前记录的最长回文串的长度，如果大于之前的回文串，则更新之前的记录即可
      palindromeStr=tempPalindrome; //更新回文串
     }
    }
   }
   return palindromeStr; //返回最终的最长的回文串
  }
  function isPalindrome(s){ //判断是否为回文串
   let rev=s.split('').reverse().join(''); //字符串逆转操作
   return rev===s;
  }
  //测试
  console.log(longestPalindrome("ddabbade"));//输出dabbad
 </script>
</body>
</html>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!