新人求教！！！问题到底在哪

Question

<script type="text/javascript">function xin(x,y)var z=x-y{if(z>0){return x;}else if(z<0){return y;}else{return x;}}var q=xin(5,4);var w=xin(6,3); document.write(" 5 和 4 的较大值是:"+q+"<br>");  document.write(" 6 和 3 的较大值是:"+w ); </script>