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...

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,
            //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>

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