简单的JavaScript字符串加密解密

简单的JavaScript字符串加密解密

 <div>
     <input type="text" id="input" autofocus="autofocus">
     <button type="button" onclick="submit()">click</button>
 </div>

 <script>
     // 加密
     function encryption(str) {

         let newstr = [];
         let number = Math.random()*200; // 0 ~ 接近200
         number = Math.trunc(number)  // 0 ~ 199

         for (let i = 0; i < str.length; i++) {

             newstr.push(str.charCodeAt(i) + number);

         }
         newstr.push(number)
         return     escape(newstr.toString());
     }

     // 解密
     function decrypt(str) {

         str = unescape(str);

         // 把字符串以逗号切割为数组
         let arr = str.split(',');
         let number = arr.pop();

         let newarr = [];
         arr.forEach(function (item) {
             let temp = String.fromCharCode(item - number);
             newarr.push(temp)
         });

         return newarr.join('');
     }

     function submit() {
         var input = document.getElementById('input');
         var value = input.value;

         console.log("加密前: ", input.value);

         let a = encryption(value);
         console.log("加密后: ", a );
         console.log("解密前: "+ a);

         console.log("解密后: ", decrypt(a ));

     }

 </script>