<p>I have a 2D array in my Javascript. The array is assigned to the variable 'arr' and looks like this: </p> <pre class="brush:php;toolbar:false;">[ [ "0", { cat_id: "1", cat_name: "Tiger", }, ], [ "1", { cat_id: "2", cat_name: "Lion", }, ], [ "2", { cat_id: "3", cat_name: "Cheetah", }, ], [ "3", { cat_id: "5", cat_name: "Leopard", }, ], ]</pre> <p>I want to give users a neat HTML table on the screen, with keys as headers and values ​​as rows, as follows: </p> <table class="s-table"> <thead> <tr> <th>cat_id</th> <th>cat_name</th> </tr> </thead> <tbody> <tr> <td>1</td> <td>Tiger</td> </tr> <tr> <td>2</td> <td>Lion</td> </tr> <tr> <td>3</td> <td>Cheetah</td> </tr> <tr> <td>4</td> <td>Leopard</td> </tr> </tbody> </table> <p>I've looked at a lot of articles on StackOverflow and around the web, but I'm not a Javascript expert and I honestly can't get anything to work.非常感谢任何帮助！</p> <p>我的HTML中包含了空表格代码：</p> <p><br /></p> <pre class="snippet-code-js lang-js prettyprint-override"><code>const arr = [["0", { cat_id: "1", cat_name: "Tiger", },], ["1", { cat_id: "2", cat_name: "Lion", },], ["2", { cat_id: "3", cat_name: "Cheetah", },], ["3", { cat_id: "5", cat_name: "Leopard", },],] var tableBody = document.getElementById("wrap"); tableBody.innerHTML = ""; arr.forEach(function (row) { var newRow = document.createElement("tr"); tableBody.appendChild(newRow); if (row instanceof Array) { row.forEach(function (cell) { var newCell = document.createElement("td"); newCell.textContent = cell; newRow.appendChild(newCell); }); } else { newCell = document.createElement("td"); newCell.textContent = row; newRow.appendChild(newCell); } });</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code><table id="wrap"></table></code></pre> <p><br /></p> <p>因为arr是一个二维数组，所以我的代码目前只会产生以下表格：</p> <pre class="brush:php;toolbar:false;">0 [object Object] 1 [object Object] 2 [object Object] 3 [object Object]</pre> <p>我明白<em>为什么</em>会发生这种情况，但我的JS水平不足以实现我想要的结果。</p>

const arr = [
  ["0", { cat_id: "1", cat_name: "Tiger" }],
  ["1", { cat_id: "2", cat_name: "Lion" }],
  ["2", { cat_id: "3", cat_name: "Cheetah" }],
  ["3", { cat_id: "5", cat_name: "Leopard" }],
];

var tableBody = document.getElementById("wrap");

tableBody.innerHTML = "";

const data = arr.map(a =>
  Object.entries(a[1]).sort(([a], [b]) => a.localeCompare(b))
);

const headerRow = document.createElement("tr");
tableBody.appendChild(headerRow);
for (const [key] of data[0]) {
  const newCell = document.createElement("td");
  newCell.textContent = key;
  headerRow.appendChild(newCell);
}

for (const datum of data) {
  const newRow = document.createElement("tr");
  tableBody.appendChild(newRow);
  for (const [, value] of datum) {
    const newCell = document.createElement("td");
    newCell.textContent = value;
    newRow.appendChild(newCell);
  }
}

<table id="wrap"></table>