如何在 JavaScript 中从字符串创建哈希？

为了从特定的字符串创建唯一的哈希，可以使用自己的字符串来实现哈希转换函数。它将返回一个字符串的哈希等价物。此外，名为 Crypto 的库可用于生成各种类型的哈希，如 SHA1、MD5、SHA256 等。

注意：空字符串的哈希值始终为零。

示例 1：

  

    
        How to convert hash from
        string in JavaScript ?
    
      
    
        h1 {
            color: green;
        }
    

  

    
        GeeksforGeeks
  
        Creating hash from string in JavaScript?
  
        The hash value of string "GeeksforGeeks" is .
  
        
  
        
          
            // Convert to 32bit integer
            function stringToHash(string) {
                  
                var hash = 0;
                  
                if (string.length == 0) return hash;
                  
                for (i = 0; i < string.length; i++) {
                    char = string.charCodeAt(i);
                    hash = ((hash << 5) - hash) + char;
                    hash = hash & hash;
                }
                  
                return hash;
            }
              
            // String printing in hash
            var gfg = "GeeksforGeeks"
              
            document.getElementById("geek").innerHTML
                        = stringToHash(gfg);
        
    

  

输出：

示例 2：

  
    // Importing 'crypto' module
    const crypto = require('crypto'),
  
    // Returns the names of supported hash algorithms 
    // such as SHA1,MD5
    hash = crypto.getHashes();
  
    // Create hash of SHA1 type
    x = "Geek"
  
    // 'digest' is the output of hash function containing 
    // only hexadecimal digits
    hashPwd = crypto.createHash('sha1').update(x).digest('hex');
  
    console.log(hash); 

输出：

321cca8846c784b6f2d6ba628f8502a5fb0683ae