请高手解释一段js代码的含义(拆解),谢谢!
eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);k=[function(e){return d[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;}('b(3>0){a(9 5=0;5<3;5++){4=6.8(4);1=6.8(1)};4=4.7(3*2);1=1.7(3*2)}',12,12,'|g_ssm||1|g_sld|iR|B64|substring|decode|var|for|if'.split('|'),0,{}));