使用javascript对HTML表的项进行分类

// 获取表格引用
var table = document.getElementById("myTable");

// 创建分类对象
var categories = {};

// 遍历表格的每一行
for (var i = 1; i < table.rows.length; i++) {
  var row = table.rows[i];
  
  // 获取需要分类的项的值
  var item = row.cells[0].textContent;
  
  // 根据项的值进行分类
  if (item === "分类1") {
    if (!categories.category1) {
      categories.category1 = [];
    }
    categories.category1.push(row);
  } else if (item === "分类2") {
    if (!categories.category2) {
      categories.category2 = [];
    }
    categories.category2.push(row);
  } else {
    if (!categories.other) {
      categories.other = [];
    }
    categories.other.push(row);
  }
}

// 清空表格内容
while (table.rows.length > 1) {
  table.deleteRow(1);
}

// 根据分类结果更新表格
for (var category in categories) {
  if (categories.hasOwnProperty(category)) {
    var rows = categories[category];
    
    // 创建分类行
    var categoryRow = document.createElement("tr");
    var categoryCell = document.createElement("td");
    categoryCell.textContent = category;
    categoryCell.colSpan = table.rows[0].cells.length;
    categoryRow.appendChild(categoryCell);
    table.appendChild(categoryRow);
    
    // 添加分类的项
    rows.forEach(function(row) {
      table.appendChild(row);
    });
  }
}