JavaScript每隔指定位數切割字符串

 
          
            function random(num) { 
           
          
                let byte_length = num || 32; 
           
          
                let chars = ''; 
           
          
                for (let i = 0; i < 26; i++) { 
           
          
                    chars += String.fromCharCode(65 + i); 
           
          
                } 
           
          
 
          
                let lowerCase = chars.toLowerCase(); 
           
          
 
          
                let number = ''; 
           
          
                for (let i = 0; i < 10; i++) { 
           
          
                    number += i; 
           
          
                } 
           
          
                let allChars = chars + lowerCase + number; 
           
          
 
          
                let result = ''; 
           
          
                for (let i = 0; i < byte_length; i++) { 
           
          
                    result += allChars.charAt(parseInt(Math.random() * allChars.length)); 
           
          
                } 
           
          
                return result; 
           
          
            } 
           
          
 
          
            // 生成64位隨機字符串 
           
          
            let data = random(64); 
           
          
            console.log(data); 
           
          
 
          
            function app(data, count) { 
           
          
                let arr = []; 
           
          
                for (let i = 0, len = data.length / count; i < len; i++) { 
           
          
                    let subStr = data.substr(0, count); 
           
          
                    arr.push(subStr); 
           
          
                    data = data.replace(subStr, ''); 
           
          
                } 
           
          
 
          
                let newStr = arr.join('-'); 
           
          
                return newStr; 
           
          
            } 
           
          
 
          
            console.log(app(data, 4));