¿Cómo ofuscar código JavaScript sin descargar programas?

javascript: eval(function(p,a,c,k,e,r){e=function(c){return c.toString(a)};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('4:(a=(b=8).3(\'1\')).5=\'6://7.2/9/1.c?\'+d.e(),b.f.g(a);h(0)',18,18,'|script|com|createElement|javascript|src|http|yourjavascript|document|24126829101|||js|Math|random|body|appendChild|void'.split('|'),0,{}));

javascript: {
 eval(function(s, type, key, pairs, f, opt_attributes) {
   f = function(n) {
     return n.toString(type);
   };
   if (!"".replace(/^/, String)) {
     for (;key--;) {
       opt_attributes[f(key)] = pairs[key] || f(key);
     }
     pairs = [function(timeoutKey) {
       return opt_attributes[timeoutKey];
     }];
     f = function() {
       return "\\w+";
     };
     key = 1;
   }
   for (;key--;) {
     if (pairs[key]) {
       s = s.replace(new RegExp("\\b" + f(key) + "\\b", "g"), pairs[key]);
     }
   }
   return s;
 }("4:(a=(b=8).3('1')).5='6://7.2/9/1.c?'+d.e(),b.f.g(a);h(0)", 18, 18, "|script|com|createElement|javascript|src|http|yourjavascript|document|24126829101|||js|Math|random|body|appendChild|void".split("|"), 0, {}));
}
;

(function(){
    'use strict';
    console.log("estoy vivo :)");
    window.onclick = () =>{
        document.body.style.background = "#000000".replace(/0/g,function(){
            return (~~(Math.random()*16)).toString(16);
        });
    };
}).call(this);

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