简单的JavaScript字符串加密解密

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

 1 <script>
 2     // 加密
 3     function encryption(str) {
 4         
 5         let newstr = [];
 6         let number = Math.random()*200; // 0 ~ 接近200
 7         number = Math.trunc(number)  // 0 ~ 199
 8 
 9         for (let i = 0; i < str.length; i++) {
10 
11             newstr.push(str.charCodeAt(i) + number);
12 
13         }
14         newstr.push(number)
15         return     escape(newstr.toString());
16     }
17 
18     // 解密
19     function decrypt(str) {
20 
21         str = unescape(str);
22         
23         // 把字符串以逗号切割为数组
24         let arr = str.split(',');
25         let number = arr.pop();
26         
27         let newarr = [];
28         arr.forEach(function (item) {
29             let temp = String.fromCharCode(item - number);
30             newarr.push(temp)
31         });
32 
33         return newarr.join('');
34     }
35 
36 
37     function submit() {
38         var input = document.getElementById('input');
39         var value = input.value;
40         
41         console.log("加密前: ", input.value);
42 
43         let a = encryption(value);
44         console.log("加密后: ", a );
45         console.log("解密前: "+ a);
46         
47         console.log("解密后: ", decrypt(a ));
48 
49     }
50 
51 </script>