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// Current
    return decodeURIComponent(str).replace(/\+/g, '%20');
// Correct
    return decodeURIComponent(str.replace(/\+/g, '%20'));

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return decodeURIComponent(str).replace(/\+/g, '%20');

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return decodeURIComponent(str.replace(/\+/g, '%20'));

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function urldecode( str ) {
    // Decodes URL-encoded string  
    // 
    // version: 907.503
    // discuss at: http://phpjs.org/functions/urldecode    // +   original by: Philip Peterson
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: AJ
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Brett Zamir (http://brett-zamir.me)    // +      input by: travc
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Lars Fischer
    // +      input by: Ratheous        // +   improved by: @Shamun Toha
        // +       note by: - Shamun: decodeURIComponent failed on many characters
    // %        note 1: info on what encoding functions to use from: http://xkr.us/articles/javascript/encode-compare/
    // *     example 1: urldecode('Kevin+van+Zonneveld%21');
    // *     returns 1: 'Kevin van Zonneveld!'    // *     example 2: urldecode('http%3A%2F%2Fkevin.vanzonneveld.net%2F');
    // *     returns 2: 'http://kevin.vanzonneveld.net/'
    // *     example 3: urldecode('http%3A%2F%2Fwww.google.nl%2Fsearch%3Fq%3Dphp.js%26ie%3Dutf-8%26oe%3Dutf-8%26aq%3Dt%26rls%3Dcom.ubuntu%3Aen-US%3Aunofficial%26client%3Dfirefox-a');
    // *     returns 3: 'http://www.google.nl/search?q=php.js&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a'
        // *     example 4: urldecode("%3Ctr%3E%3Ctd%3Einfo%40jquery.com%20space%20%E9%3C%2Ftd%3E%3C%2Ftr%3E");        // *     returns 4: <tr><td>info@jquery.com Space e</td></tr>
    
    var hash_map = {}, ret = str.toString(), unicodeStr='', hexEscStr='';
    
    var replacer = function(search, replace, str) {        var tmp_arr = [];
        tmp_arr = str.split(search);
        return tmp_arr.join(replace);
    };
        // The hash_map is identical to the one in urlencode.
    hash_map["'"]   = '%27';
    hash_map['(']   = '%28';
    hash_map[')']   = '%29';
    hash_map['*']   = '%2A';    hash_map['~']   = '%7E';
    hash_map['!']   = '%21';
    hash_map['%20'] = '+';
    hash_map['\u00DC'] = '%DC';
    hash_map['\u00FC'] = '%FC';    hash_map['\u00C4'] = '%D4';
    hash_map['\u00E4'] = '%E4';
    hash_map['\u00D6'] = '%D6';
    hash_map['\u00F6'] = '%F6';
    hash_map['\u00DF'] = '%DF';    hash_map['\u20AC'] = '%80';
    hash_map['\u0081'] = '%81';
    hash_map['\u201A'] = '%82';
    hash_map['\u0192'] = '%83';
    hash_map['\u201E'] = '%84';    hash_map['\u2026'] = '%85';
    hash_map['\u2020'] = '%86';
    hash_map['\u2021'] = '%87';
    hash_map['\u02C6'] = '%88';
    hash_map['\u2030'] = '%89';    hash_map['\u0160'] = '%8A';
    hash_map['\u2039'] = '%8B';
    hash_map['\u0152'] = '%8C';
    hash_map['\u008D'] = '%8D';
    hash_map['\u017D'] = '%8E';    hash_map['\u008F'] = '%8F';
    hash_map['\u0090'] = '%90';
    hash_map['\u2018'] = '%91';
    hash_map['\u2019'] = '%92';
    hash_map['\u201C'] = '%93';    hash_map['\u201D'] = '%94';
    hash_map['\u2022'] = '%95';
    hash_map['\u2013'] = '%96';
    hash_map['\u2014'] = '%97';
    hash_map['\u02DC'] = '%98';    hash_map['\u2122'] = '%99';
    hash_map['\u0161'] = '%9A';
    hash_map['\u203A'] = '%9B';
    hash_map['\u0153'] = '%9C';
    hash_map['\u009D'] = '%9D';    hash_map['\u017E'] = '%9E';
    hash_map['\u0178'] = '%9F';
        // on decodeURIComponent failure.
        hash_map['<']      = '%3C';
        hash_map['>']      = '%3E';        hash_map['/']      = '%2F';
        hash_map['@']      = '%40'; 
        hash_map['e']      = '%E9';     
        hash_map[' ']      = '%20';
         
    for (unicodeStr in hash_map) {
        hexEscStr = hash_map[unicodeStr]; // Switch order when decoding
        ret = replacer(hexEscStr, unicodeStr, ret); // Custom replace. No regexing
    }    
    // End with decodeURIComponent, which most resembles PHP's encoding functions
    ret = decodeURIComponent(ret);
 
    return ret;}

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// output this: <tr><td>info@jquery.com Space e</td></tr>
var a = "%3Ctr%3E%3Ctd%3Einfo%40jquery.com%20space%20%E9%3C%2Ftd%3E%3C%2Ftr%3E";
alert ( urldecode(a) );

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ret = decodeURIComponent(ret);

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ret = decodeURIComponent(unescape(ret));

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hash_map['\u00C6']   = '%C3%86';
hash_map['\u00D8']   = '%C3%98';
hash_map['\u00C5']   = '%C3%85';

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histogram['\u00DC']   = '%DC';
histogram['\u00FC']   = '%FC';
histogram['\u00C4']   = '%D4';
histogram['\u00E4']   = '%E4';
histogram['\u00D6']   = '%D6';histogram['\u00F6']   = '%F6';

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histogram["'"]   = '%27';
histogram['(']   = '%28';
histogram[')']   = '%29';
histogram['*']   = '%2A';
histogram['~']   = '%7E';

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histogram['%20'] = '+';

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var $__t = '\'a\' +b+ \"c\" %d% \\\\  \\\\';
alert(urlencode($__t));

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<?php
        $__t = '\'a\' +b+ \"c\" %d% \\\\  \\\\';
?>
alert("<?= $__t ?>");
alert("<?= urlencode($__t) ?>");alert("<?= urldecode(urlencode($__t)) ?>");
alert(urldecode("<?= urlencode($__t) ?>")); // It fails with your function!

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function urdencode (str) {
    return decodeURIComponent(str);
}