JS里charCodeAt()和fromCharCode()方法拓展应用：加密与解密
摘要
JS里charCodeAt()和fromCharCode()方法拓展应用：加密与解密
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>JS网页加密及解密</title>
<meta name="author" content="YZMCMS" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head>
<body>
<p><textarea id="text1" name="textfield" cols="50" rows="5">YzmCMS这个产品怎么样?</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,Encrypt: function (Text) { /*加密*/
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]);
}
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]);
}
return output;
}
}
};
/*测试代码*/var testString = "光头强，还不去砍树？";
console.log(testString);
var sign = MySign.Encrypt(testString);
var sign2 = MySign.UnEncrypt(sign); /*光头强，还不去砍树？*/console.log(sign);
console.log(sign2);
</script>
</body>
</html>
转载：http://blog.yzmcms.com/html/js/185.html