for和while实现表格

//for实现99乘法表
document.write('for实现99乘法表')
document.write('<table width="500" height="500" border="1">')
for(var i=1;i<=9;i++){
    document.write('<tr>');
    for(var j=1;j<=i;j++){
        document.write('<td>'+i+'*'+j+'='+i*j+'</td>')
    }
    document.write('</tr>');
}
document.write('</table>'

 

//while实现99乘法表
 var i=1 ;
 while(i<=9){
  var j=1;
  while(j<=i){
   document.write(i+"*"+j+"="+i*j+" ");
   j=j+1;
  }
  i=i+1;
  document.write("<br>");
 }

 

//for实现9*9表格
document.write('for实现9*9表格')
document.write('<table width="1000" heigt="100" border="1" >');
    for(var i=1;i<=9;i++){
        document.write('<tr>');
        for(var j=1;j<=9;j++){
            if(i%2==1){
            document.write('<td>'+'第'+i+'行'+'第'+j+'列'+'</td>');
          }
          if(i%2==0){
            document.write('<td bgcolor="red">'+'第'+i+'行'+'第'+j+'列'+'</td>');
          }
        }
        document.write('</tr>');
    }
document.write('</table>');

 

 

//while实现9*9表格
document.write('while实现9*9表格')
document.write('<table width="730" height="500" border="1">')
var i=1;
while(i<=9){
    document.write('<tr>');
        var j=1;
        while(j<=9){
        document.write('<td>'+'这是第'+i+'行'+'第'+j+'列'+'</td>')
        j++
        }
    document.write('</tr>');
    i++
}
document.write('</table>');