Java scriptte döngü nasıl yapılır yardım ??

for (i = 0; i < 2; i++) {
  for (j = 0; j < 2; j++) {
    document.write((j + 1) + '-' + a[i][j] + ' ');
  }
  document.write('<br>');
}

<script language="JavaScript">
<!--
function getAddress(){
var a=new Array();
a[0]=new Array(); a[0][0]='okul'; a[0][1]='kantin'; 
a[1]=new Array(); a[1][0]='web'; a[1][1]='site';
return a;
for (i = 0; i < 2; i++) {
  for (j = 0; j < 2; j++) {
    document.write((j + 1) + '-' + a[i][j] + ' ');
  }
  document.write('<br>');
} 

}

getAddress();



--></script>