js中加密及设置cookie

1、设置cookie及有效期时长

//cname:cookie的名称，cvalue：cookie的内容，exdays:cookie有效期时长；

function setCookie(cname, cvalue, exdays) {

    var d = new Date();

//    d.setTime(d.getTime() + (exdays*1000));//设置过期时间是多少天后；

//    d.setTime(d.getTime() + (exdays*60*60*1000));//设置过期时间是多少小时；

    d.setTime(d.getTime() + (exdays*60*60*1000));//设置过期时间是多少小时；

    var expires = "expires="+d.toUTCString();



    document.cookie = cname + "=" + cvalue + "; " + expires;

}

//获取cookie;

function getCookie(cname) {

    var name = cname + "=";

    var ca = document.cookie.split(';');

    for(var i=0; i<ca.length; i++) {

        var c = ca[i];

        while (c.charAt(0)==' ') c = c.substring(1);

        if (c.indexOf(name) != -1) return c.substring(name.length, c.length);

    }

    return null;

}

//清除cookie;

function clearCookie(name) {

    setCookie(name, "", -1);

}

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2、在工程中用到的加密：（base64加密）

/*

 * 加密解密

 * */

var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

var base64DecodeChars = new Array(-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1,

    63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1,

    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,

    20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31,

    32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,

    50, 51, -1, -1, -1, -1, -1);

//加密

function base64encode(str) {

    var out, i, len;

    var c1, c2, c3;

    len = str.length;

    i = 0;

    out = "";

    while (i < len) {

        c1 = str.charCodeAt(i++) & 0xff;

        if (i == len) {

            out += base64EncodeChars.charAt(c1 >> 2);

            out += base64EncodeChars.charAt((c1 & 0x3) << 4);

            out += "==";

            break;

        }

        c2 = str.charCodeAt(i++);

        if (i == len) {

            out += base64EncodeChars.charAt(c1 >> 2);

            out += base64EncodeChars.charAt(((c1 & 0x3) << 4)

                | ((c2 & 0xF0) >> 4));

            out += base64EncodeChars.charAt((c2 & 0xF) << 2);

            out += "=";

            break;

        }

        c3 = str.charCodeAt(i++);

        out += base64EncodeChars.charAt(c1 >> 2);

        out += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));

        out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));

        out += base64EncodeChars.charAt(c3 & 0x3F);

    }

    return out;

}

//解密

function base64decode(str) {

    var c1, c2, c3, c4;

    var i, len, out;

    len = str.length;

    i = 0;

    out = "";

    while (i < len) {

        /* c1 */

        do {

            c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];

        } while (i < len && c1 == -1);

        if (c1 == -1)

            break;

        /* c2 */

        do {

            c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];

        } while (i < len && c2 == -1);

        if (c2 == -1)

            break;

        out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

        /* c3 */

        do {

            c3 = str.charCodeAt(i++) & 0xff;

            if (c3 == 61)

                return out;

            c3 = base64DecodeChars[c3];

        } while (i < len && c3 == -1);

        if (c3 == -1)

            break;

        out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

        /* c4 */

        do {

            c4 = str.charCodeAt(i++) & 0xff;

            if (c4 == 61)

                return out;

            c4 = base64DecodeChars[c4];

        } while (i < len && c4 == -1);

        if (c4 == -1)

            break;

        out += String.fromCharCode(((c3 & 0x03) << 6) | c4);

    }

    return out;

}

//编码转换

function utf16to8(str) {

    var out, i, len, c;

    out = "";

    len = str.length;

    for (i = 0; i < len; i++) {

        c = str.charCodeAt(i);

        if ((c >= 0x0001) && (c <= 0x007F)) {

            out += str.charAt(i);

        } else if (c > 0x07FF) {

            out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));

            out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));

            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));

        } else {

            out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));

            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));

        }

    }

    return out;

}

function utf8to16(str) {

    var out, i, len, c;

    var char2, char3;

    out = "";

    len = str.length;

    i = 0;

    while (i < len) {

        c = str.charCodeAt(i++);

        switch (c >> 4) {

            case 0:

            case 1:

            case 2:

            case 3:

            case 4:

            case 5:

            case 6:

            case 7:

                // 0xxxxxxx

                out += str.charAt(i - 1);

                break;

            case 12:

            case 13:

                // 110x xxxx 10xx xxxx

                char2 = str.charCodeAt(i++);

                out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));

                break;

            case 14:

                // 1110 xxxx 10xx xxxx 10xx xxxx

                char2 = str.charCodeAt(i++);

                char3 = str.charCodeAt(i++);

                out += String.fromCharCode(((c & 0x0F) << 12)

                    | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0));

                break;

        }

    }

    return out;

}



var mingwen="123456";

var miwen='',jiemiMiwen='';

miwen=base64encode(mingwen);

jiemiMiwen=base64decode(miwen);

console.log("加密后的密文:"+miwen);

console.log("解密后的明文:"+jiemiMiwen);

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结果是：

加密后的密文:MTIzNDU2

解密后的明文:123456