JavaScript 实现字符串加密和解密

   注：该加密解码功能只在IE浏览器中测试过，其他浏览器暂未测试，请谅解

   var sdf3 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcde";

    // 加密    function textEncrypt(str) {        var t = "";        var a, a1, a2, a3;        var b = sdf3.split("");        for (var x = 0; x < str.length; x++) {            a = str.charCodeAt(x);            a1 = a % 41;            a = (a - a1) / 41;            a2 = a % 41;            a = (a - a2) / 41;            a3 = a % 41;            t += b[a3] + b[a2] + b[a1];        }        a = "z";        for (var x = 0; x < t.length; x += 3) {            if (t.charAt(x) != "A") {                return t;            }            a += t.substr(x + 1, 2);        }        return a;    }

 

    // 解密

    function textDecryption(str) {        var a1, a2, a3, b = sdf3;        var d = 0;        var t, a;        if (str.charAt(0) == "z") {            t = new Array(Math.floor((str.length - 1) / 2));            a = t.length;            for (var x = 0; x < a; x++) {                d++;                a2 = b.indexOf(str.charAt(d));                d++;                a3 = b.indexOf(str.charAt(d));                t[x] = a2 * 41 + a3;            }        }else {            t = new Array(Math.floor(str.length / 3));            a = t.length;            for (var x = 0; x < a; x++) {                a1 = b.indexOf(str.charAt(d));                d++;                a2 = b.indexOf(str.charAt(d));                d++;                a3 = b.indexOf(str.charAt(d));                d++;                t[x] = a1 * 1681 + a2 * 41 + a3;            }        }        a = eval("String.fromCharCode(" + t.join(',') + ")");        return a;    }

 

    // 拷贝到粘贴板    function copy(value) {        var Result = value;        if (Result == "") {            return;        } else {            window.clipboardData.setData("Text", Result);            window.alert('已复制成功。');        }    }