These are the bugs.

"elseif"  

instead of "else if"

"{ consle.log(x + " even");"  

There is no curly base at the end.

"else"  

There is no 'if' there.

expected output.

for (var x=1; x <=5 ; x+=) 
  if (x === 0) { console.log(x +  " is zero"); }
  else if (x % 2 === 0) { consle.log(x + " even"); }  
  else if { console.log(x + " is odd"); }
}

"People are mostly focused on defending the computers on the Internet, and there's been surprisingly little attention to defending the Internet itself as a communications medium." - W. Daniel Hillis