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兼容低版本 IE 的 JScript 5.5 实现
作者:武汉SEO闵涛  文章来源:敏韬网  点击数3769  更新时间:2009/4/23 11:27:39  文章录入:mintao  责任编辑:mintao
gt;>  0) & 0x3F)).toString(16).toUpperCase();
        }
        else {
            out += '%' + (0xC0 | ((c >>  6) & 0x1F)).toString(16).toUpperCase();
            out += '%' + (0x80 | ((c >>  0) & 0x3F)).toString(16).toUpperCase();
        }
    }
    return out;
}
 
function encodeURIComponent(str) {
    var l = ['%00', '%01', '%02', '%03', '%04', '%05', '%06',
             '%07', '%08', '%09', '%0A', '%0B', '%0C', '%0D',
             '%0E', '%0F', '%10', '%11', '%12', '%13', '%14',
             '%15', '%16', '%17', '%18', '%19', '%1A', '%1B',
             '%1C', '%1D', '%1E', '%1F', '%20', '!', '%22',
             '%23', '%24', '%25', '%26', "'", '(', ')', '*', '%2B', '%2C',
             '-', '.', '%2F', '0', '1', '2', '3', '4', '5', '6',
             '7', '8', '9', '%3A', '%3B', '%3C', '%3D', '%3E', '%3F',
             '%40', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
             'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
             'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '%5B', '%5C',
             '%5D', '%5E', '_', '%60', 'a', 'b', 'c', 'd', 'e',
             'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
             'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
             'z', '%7B', '%7C', '%7D', '~', '%7F'];
    var out, i, len, c;
 
    out = "";
    len = str.length;
    for(i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if (c <= 0x007F) {
            out += l[c];
        }
        else if (c > 0x07FF) {
            out += '%' + (0xE0 | ((c >> 12) & 0x0F)).toString(16).toUpperCase();
            out += '%' + (0x80 | ((c >>  6) & 0x3F)).toString(16).toUpperCase();
            out += '%' + (0x80 | ((c >>  0) & 0x3F)).toString(16).toUpperCase();
        }
        else {
            out += '%' + (0xC0 | ((c >>  6) & 0x1F)).toString(16).toUpperCase();
            out += '%' + (0x80 | ((c >>  0) & 0x3F)).toString(16).toUpperCase();
        }
    }
    return out;
}
 
function decodeURI(str) {
    function throwerror() {
        @if (@_jscript_version < 5)
            return null;
        @else
            var e = new Error(-2146823263, "The URI to be decoded is not a valid encoding");
            e.name = "URIError";
            e.message = e.description;
            throw(e);
        @end
    }
    function checkcode() {
        var d1, d2;
        d1 = str.charAt(i++);
        d2 = str.charAt(i++);
        if (isNaN(parseInt(d1, 16)) || isNaN(parseInt(d2, 16))) {
            return throwerror();
        }
        return parseInt(d1 + d2, 16);
    }
    function checkutf8() {
        var c = str.charCodeAt(i++);
        if (c == 37) {
            if ((c = checkcode()) == null) return null;
        }
        if ((c >> 6) != 2) {
            return throwerror();
        }
    }
    var out, i, len;
    var c, c2, c3;
 
    out = "";
    len = str.length;
    i = 0;
    while(i < len) {
        c = str.charCodeAt(i++);
        if (c == 37) {
            if ((c = checkcode()) == null) return null;
        }
        else {
            out += String.fromCharCode(c);
            continue;
        }
        switch(c) {
            case 35: case 36: case 38: case 43: case 44: case 47:
            case 58: case 59: case 61: case 63: case 64: {
                if (str.charCodeAt(i - 3) == 37) {
                    out += str.substr(i - 3, 3);
                }
                else {
                    out += str.substr(i - 1, 1);
                }
                break;
            }
            default: {
                switch(c >> 4) {
                    case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: {
                        // 0xxxxxxx
                        out += String.fromCharCode(c);
                        break;
                    }
                    case 12: case 13: {
                        // 110x xxxx   10xx xxxx
                        if ((c2 = checkutf8()) == null) return null;
                        out += String.fromCharCode(((c & 0x1F) << 6) | (c2 & 0x3F));
                        break;
                    }
                    c

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