//用于网页地址参数
//参数中包含出了英文中文数字之外的其他符号时进行编码并在前面加“==”进行标识，否则直接返回
//解码时根据是否含有“==”标识来决定是否要解码
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64Encode = 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 reg=/^[a-zA-Z0-9]*$/;
    if(str==null || reg.test(str))
    {
        return str;
    }
    str=Utf16To8(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);
    }

    out=out.replace(/\//g,"@@")
    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 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;
}
//base64编码结束

function ValidateEmail(str) {
    var r = /^[a-zA-Z0-9._%-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
    if (r.test(str)) {
        return true;
    } else {
        return false;
    }
}

function ValidateTelPhone(str) {
    var s = /^(\d{2,4})(-(\d{7,8}))$/;
    if (s.test(str)) {
        return true;
    } else {
        return false;
    }
}

function ValidatePhone(str) {
    var regu = /^[1][3,5,8][0-9]{9}$/;
    var re = new RegExp(regu);
    if (re.test(str)) {
        return true;
    }
    else {
        return false;
    }
}


/*设置与获取Cookie*/
var Cookie = {}
Cookie.write = function (key, value, duration) {
    var d = new Date();
    d.setTime(d.getTime() + 1000 * 60 * 60 * 24 * 30);
    document.cookie = key + "=" + encodeURI(value) + "; expires=" + d.toGMTString();
};
Cookie.read = function (key) {
    var arr = document.cookie.match(new RegExp("(^| )" + key + "=([^;]*)(;|$)"));
    if (arr != null)
        return decodeURIComponent(arr[2]);
    return "";
};

//input去掉默认内容还原编辑样式
function g_on_setvalue(id, value, cname) {
    var obj = document.getElementById(id);
    if (obj.value != value) {
        return false;
    }
    obj.value = http://www.mamicode.com/"";>
网站常用的一些javascript封装 简化调用