<script type="text/javascript">
  var body = document.getElementsByTagName('body')[0];
  var wrap = document.createElement('div');
  wrap.id = 'wrap';
  body.appendChild(wrap);
  var wrap = document.getElementById('wrap');
  for (var i = 1; i < 10; i++) {
   for (var j = 1; j <= i; j++) {
    var p = document.createElement('p');
    //设置格子(p标签)样式
    p.style.width = '100px';
    p.style.height = '30px';
    p.style.lineHeight = '30px';
    p.style.background = 'yellow';
    p.style.display = 'inline-block';
    p.style.border = '1px solid green';
    p.style.textAlign = 'center';
    //格子添加内容
    p.innerHTML = j + "*" + i + "=" +(j * i);
    wrap.appendChild(p);
   }
   var br = document.createElement('br');
   wrap.appendChild(br);
  }
 </script>

* {
  padding : 0px;
  margin : 0px;
  }