如何使用JavaScript创建4行7列的网格？

Question

我是JavaScript的新手，需要一些帮助！

我试图创建一个类似键盘的东西:创建一个网格，然后插入带有字母字母的引导按钮。我希望它是4行，每一行有7列。我试着只创建一行，包含多个列，但它不起作用，它只创建了一行和一个列。我该怎么解决这个问题？

HTML：

<div class="row justify-content-center container" id="buttons-space"></div>

JavaScript：

var alphabet =["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"];

function createKeyboard() {
  var space = document.getElementById("buttons-space");
  var row = document.createElement("div");
  row.id = "first-row";
  row.className = "row container";
  space.appendChild(row); 
  for (var i = 1; i <= 7; ++i) {
    var col = document.createElement("div");
    col.className = "col-1 my-2 mx-2";
    document.getElementById("first-row").appendChild(col); 
    var button = document.createElement("button");
    button.className = "btn btn-warning";
    button.style = "height: 40px; width: 40px";
    button.id = alphabet[i];
    button.innerText = alphabet[i];
    col.appendChild(button);
  }
}

我必须只使用JavaScript，而不是CSS。

Answer 1

​

const alphabet = Array(26).fill(0).map((x,i)=>String.fromCharCode(i+97));

document.querySelector('.grid-container').innerHTML = alphabet.map(alpha=>`<div class="grid-item">${alpha}</div>`).join('');

.grid-container {
  display: grid;
  grid-template-columns: repeat(7, 20px);
  background-color: #2196F3;
  padding: 2px;
}
.grid-item {
  background-color: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(0, 0, 0, 0.8);
  padding: 2px;
  font-size: 15px;
  text-align: center;
}

<div class="grid-container">
</div>

​

我希望它是4行，每一行有7列

动态使用属性网格模板列将为每一行提供7 cols。来自w3schools的例子。