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：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> <title>网页加密及解密</title>
<meta name="author" content="xiongzaiqiren" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta name="generator" content="ClassBao team coding in July 10, 2017" /> </head> <body>
<p><textarea id="text1" name="textfield" cols="50" rows="5">钱庄王员外这个人怎么样?</textarea></p>
<input type="button" name="Button1" value="加密" onClick="text1.value = MySign.Encrypt(text1.value);">
<input type="button" name="Button2" value="解密" onClick="text1.value = MySign.UnEncrypt(text1.value);"> <script language="JavaScript">
var MySign = {
//加密/解密次数
num: 0,
//加密
Encrypt: function (Text) {
this.num = this.num + 1;
output = new String;
alterText = new Array();
varCost = new Array();
TextSize = Text.length;
for (i = 0; i < TextSize; i++) {
idea = Math.round(Math.random() * 111) + 77;
alterText[i] = Text.charCodeAt(i) + idea;
varCost[i] = idea;
}
for (i = 0; i < TextSize; i++) {
output += String.fromCharCode(alterText[i], varCost[i]);
}
//text1.value = output;
return output;
}, //解密
UnEncrypt: function (Text) {
if (this.num > 0) {
this.num = this.num - 1;
output = new String;
alterText1 = new Array();
varCost1 = new Array();
TextSize = Text.length;
for (i = 0; i < TextSize; i++) {
alterText[i] = Text.charCodeAt(i);
varCost[i] = Text.charCodeAt(i + 1);
}
for (i = 0; i < TextSize; i = i + 2) {
output += String.fromCharCode(alterText[i] - varCost[i]);
}
//text1.value = output;
return output;
}
}
}; //测试代码
var testString = "光头强，还不去砍树？";
console.log(testString); var sign = MySign.Encrypt(testString); //凑妣o忕ｧ[還¬什³呯´硠S桲aﾁb
var sign2 = MySign.UnEncrypt(sign); //光头强，还不去砍树？ console.log(sign);
console.log(sign2); </script> </body>
</html>