JS里charCodeAt()和fromCharCode()方法拓展应用：加密与解密

PHP中文网

发布时间：2017-07-10 18:10:53

1672人浏览过

来源于php中文网

原创

js实现客户端的网页加密解密技术，可用作选择性隐蔽展示。当然客户端的加密安全度是不能与服务器相提并论，肯定不能用于密码这类内容的加密，但对于一般级别的内容用作展示已经够了。

JS加密与解密的解决方案有很多，本文则利用String对象的charCodeAt()方法和fromCharCode()方法对字符的ASCII编码进行获取和修改。

加密,解密代码：

剪映

一款全能易用的桌面端剪辑软件

下载

 1 DOCTYPE html>
 2 <html>
 3 <head>
 4     <meta charset="utf-8">
 5 
 6     <title>网页加密及解密title>
 7     <meta name="author" content="xiongzaiqiren" />
 8     <meta name="keywords" content="" />
 9     <meta name="description" content="" />
10     <meta name="generator" content="ClassBao team coding in July 10, 2017" />
11 
12 head>
13 
14 <body>
15     <p><textarea id="text1" name="textfield" cols="50" rows="5">钱庄王员外这个人怎么样?textarea>p>
16     <input type="button" name="Button1" value="加密" onClick="text1.value = MySign.Encrypt(text1.value);">
17     <input type="button" name="Button2" value="解密" onClick="text1.value = MySign.UnEncrypt(text1.value);">
18 
19     <script language="JavaScript">
20         var MySign = {
21             //加密/解密次数
22             num: 0,
23             //加密
24             Encrypt: function (Text) {
25                 this.num = this.num + 1;
26                 output = new String;
27                 alterText = new Array();
28                 varCost = new Array();
29                 TextSize = Text.length;
30                 for (i = 0; i < TextSize; i++) {
31                     idea = Math.round(Math.random() * 111) + 77;
32                     alterText[i] = Text.charCodeAt(i) + idea;
33                     varCost[i] = idea;
34                 }
35                 for (i = 0; i < TextSize; i++) {
36                     output += String.fromCharCode(alterText[i], varCost[i]);
37                 }
38                 //text1.value = output;
39                 return output;
40             },
41 
42             //解密
43             UnEncrypt: function (Text) {
44                 if (this.num > 0) {
45                     this.num = this.num - 1;
46                     output = new String;
47                     alterText1 = new Array();
48                     varCost1 = new Array();
49                     TextSize = Text.length;
50                     for (i = 0; i < TextSize; i++) {
51                         alterText[i] = Text.charCodeAt(i);
52                         varCost[i] = Text.charCodeAt(i + 1);
53                     }
54                     for (i = 0; i < TextSize; i = i + 2) {
55                         output += String.fromCharCode(alterText[i] - varCost[i]);
56                     }
57                     //text1.value = output;
58                     return output;
59                 }
60             }
61         };
62 
63 
64         //测试代码
65         var testString = "光头强，还不去砍树？";
66         console.log(testString);
67 
68         var sign = MySign.Encrypt(testString); //凑妣o忕ｧ[還¬什³呯´硠S桲aﾁb
69         var sign2 = MySign.UnEncrypt(sign); //光头强，还不去砍树？
70 
71         console.log(sign);
72         console.log(sign2);
73 
74     script>
75 
76 body>
77 html>