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标题 JS实现的base64加密解密完整实例
内容
    这篇文章主要介绍了JS实现的base64加密解密,以完整实例形式分析了JavaScript基于base64编码实现加密与解密的具体步骤与相关技巧,并附带了相关的加密解密在线工具地址供大家参考,需要的朋友可以参考下
    本文实例讲述了JS实现的base64加密解密。分享给大家供大家参考，具体如下：
    完整的代码：
    <HTML>
    <HEAD>
    <TITLE>Base64</TITLE>
    <script language=javascript>
    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);
    <HTML>
    <HEAD>
    <TITLE>Base64</TITLE>
    <script language=JavaScript>
    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);
    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;
    }
    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;
    }
    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 xxxx10xx xxxx10xx xxxx
    char2 = str.charCodeAt(i++);
    char3 = str.charCodeAt(i++);
    out += String.fromCharCode(((c & 0x0F) << 12) |
    ((char2 & 0x3F) << 6) |
    ((char3 & 0x3F) << 0));
    break;
     }
    }
    return out;
    }
    function doit() {
    var f = document.f
    f.output.value = base64encode(utf16to8(f.source.value))
    f.decode.value = utf8to16(base64decode(f.output.value))
    }
    </script>
    </HEAD>
    <BODY>
    <H1>Base64</H1>
    <FORM NAME="f">
    原码<BR>
    <TEXTAREA NAME="source" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>
    Base64 encode<BR>
    <TEXTAREA NAME="output" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>
    Base64 decode<BR>
    <TEXTAREA NAME="decode" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>
    <INPUT TYPE=BUTTON VALUE="转换" ONCLICK="doit()">
    </FORM>
    </BODY>
    希望本文所述对大家JavaScript程序设计有所帮助。
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更新时间：2025/5/18 4:56:09