gridster.js 限制单元格缩放大小

<!doctype html>
<html>
<head>
  <title>gridster.js 例子</title>
  <link href="https://www.itxst.com/package/gridster/jquery.dsmorse-gridster.min.css" rel="stylesheet" type="text/css">
  <script src="https://www.itxst.com/package/gridster/jquery.min.js"></script>
  <script src="https://www.itxst.com/package/gridster/jquery.dsmorse-gridster.min.js"></script>
</head>

<body>
  <p>gridster.js 限制单元格缩放大小</p>
  <div class="gridster">
    <ul>
    </ul>
  </div>
  <script type="text/javascript">
  var gridster;
  var serialization = [
    { row: 1, col: 1, size_x: 2, size_y: 2 },
  ];
  // sort serialization
  serialization = Gridster.sort_by_row_and_col_asc(serialization);

$(function () {
    //初始化 gridster 对象
    gridster = $(".gridster ul").gridster({
      //每个单元格最小的宽高 单位像素
      widget_base_dimensions: [150, 150],
      //单元格之间的距离
      widget_margins: [5, 5],
      //是否可以放大缩小单元格
      resize: {
        enabled: true
      }
    }).data('gridster');

gridster.remove_all_widgets();
    $.each(serialization, function (index) {
    // 最大允许占3列3行 最小2行2列
      gridster.add_widget('<li>' + (index + 1) + '</li>', this.size_x, this.size_y, this.col, this.row, [3, 3], [2, 2]);
    });

});
  </script>
  <style>
    body {
      background: #26941f;
      font-size: 16px;
      color: #ffffff;
      margin: 0;
    }

h1,
    h2,
    h3,
    p {
      margin: 10px;
    }

.gridster .gs-w {
      background: #61A9CF;
      cursor: pointer;
      -webkit-box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
      box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
    }

.gridster .player {
      -webkit-box-shadow: 3px 3px 5px rgba(0, 0, 0, 0.3);
      box-shadow: 3px 3px 5px rgba(0, 0, 0, 0.3);
      background: #BBB;
    }

.gridster .preview-holder {
      border: none !important;
      border-radius: 0 !important;
      background: red !important;
    }

.gridster ul {
      background-color: #EFEFEF;
    }

.gridster li {
      font-size: 1em;
      font-weight: bold;
      text-align: center;
      line-height: 100%;
    }

ul {
      list-style-type: none;
    }

li {
      list-style: none;
      font-weight: bold;
    }

.gridster-box {
      position: relative;
      width: 100%;
      height: 100%;
    }

.controls {
      margin-bottom: 20px;
    }
  </style>
</body>

</html>