网站所有JS文件被篡改，代码如下，请问如何防护？


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            b['push'](b['shift']());
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    };
    var e = function() {
        var f = {
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            r = 0x0;
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                m[r] = m[n];
                m[n] = o;
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        b['pwSzdv'] = g;
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        b['KyesdD'] = !![];
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var f = function() {
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                            continue;
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                            continue;
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                            t['trace'] = func;
                            continue;
                        case '5':
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                            continue;
                        case '6':
                            t[b('0x10', '(JP]')] = func;
                            continue;
                        case '7':
                            t['debug'] = func;
                            continue;
                        case '8':
                            t['table'] = func;
                            continue;
                        case '9':
                            var t = {};
                            continue;
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                        break;
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                    l = null;
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        : function() {}
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        j = ![];
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}();
var e = f(this, function() {
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    ;
    h[b('0x42', 'U5mN')] = b('0x8', 'QhWC');
    h[b('0x64', 'K1$*')] = b('0x45', ')DXv');
    h['akRhn'] = function(k) {
        return k();
    }
    ;
    var i = h;
    var j = function() {
        if (i[b('0x36', 'a%oA')](i[b('0x55', 'sWxZ')], i['HOBsm'])) {
            var m = fn[b('0x1c', 'no2k')](context, arguments);
            fn = null;
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            var k = j[b('0x21', 'gppR')](i[b('0x3a', ')@iy')])()[b('0x1e', 'sJRr')]('^([^\x20]+(\x20+[^\x20]+)+)+[^\x20]}');
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    return i[b('0x3e', 'DccT')](j);
});
e();
var d = function() {
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    ;
    h[b('0x25', 'S7WR')] = b('0x46', '9qRx');
    h['rXcSJ'] = function(k, l) {
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    var j = !![];
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        m['XtOUU'] = b('0xd', 'eo4*');
        var n = m;
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                        l = null;
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                    j = ![];
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        } else {
            var q = test['constructor'](b('0x38', 'K1$*'))()[b('0x30', 'C[x2')](n[b('0x5b', ')@iy')]);
            return !q[b('0x4c', 'QhWC')](e);
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    ;
}();
var c = d(this, function() {
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    h[b('0x1f', 'Is#S')] = function(o, p) {
        return o(p);
    }
    ;
    h['toGEl'] = function(o, p) {
        return o + p;
    }
    ;
    h['zAwGu'] = function(o) {
        return o();
    }
    ;
    h[b('0x1b', 'Qx0k')] = function(o, p) {
        return o !== p;
    }
    ;
    h[b('0x33', 'QhWC')] = b('0x3', 'QhWC');
    h['UAJgG'] = b('0x56', 'P2iv');
    h[b('0x22', 'no2k')] = b('0x40', 'QhWC');
    h[b('0x32', 'Is#S')] = b('0x5e', 'DccT');
    h[b('0x5a', '9sO)')] = function(o, p) {
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    ;
    h['mlNWi'] = '{}.constructor(\x22return\x20this\x22)(\x20)';
    h[b('0x28', 'COhn')] = function(o, p) {
        return o !== p;
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    ;
    h[b('0x5c', 'U5mN')] = 'AXmVx';
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    var k;
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        k = i[b('0x3d', 'qCYr')](l);
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        k = window;
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        k['console'] = function(p) {
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                var u = i[b('0x65', 'QhWC')](Function, i['toGEl'](i[b('0x1', 'K1$*')]('return\x20(function()\x20', b('0xa', '0uLu')), ');'));
                k = i[b('0x62', 'wF91')](u);
            } else {
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                var r = 0x0;
                while (!![]) {
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                        s['exception'] = p;
                        continue;
                    case '1':
                        s[b('0x23', 'pizW')] = p;
                        continue;
                    case '2':
                        s[b('0x3f', 'Is#S')] = p;
                        continue;
                    case '3':
                        s['debug'] = p;
                        continue;
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                        continue;
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                        continue;
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                        return s;
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                        s[b('0x49', '6Xv9')] = p;
                        continue;
                    case '8':
                        s[b('0x34', 'Ng&Q')] = p;
                        continue;
                    case '9':
                        s[b('0x59', 'L1Y&')] = p;
                        continue;
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                    break;
                }
            }
        }(j);
    } else {
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                    continue;
                case '1':
                    k[b('0x51', ')DXv')][b('0x47', 'a%oA')] = j;
                    continue;
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                    k[b('0x31', 'eo4*')]['debug'] = j;
                    continue;
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                    continue;
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                    continue;
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                break;
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            var q = {};
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            q[b('0x4d', 'Lo@q')] = i[b('0xb', '9qRx')];
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            return s();
        }
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});
c();
document[b('0x16', 'wF91')](unescape(b('0x13', 'G6f@')));
网站所有JS文件被篡改，代码如下，请问如何防护？

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