用 HTMl div 覆盖整个 div

问题描述

假设屏幕尺寸为 1920by1080，那么我想要用户输入的 div 假设说 200by200

那么这些尺寸的 div 应该创建整个屏幕。我如何使用 HMTL、CSS 和 javascript 做到这一点。

      div {
    height: 200px;
    width: 200px;
    background-color: red;
    padding-bottom: 20px;
    Box-shadow: 2px 2px 8px rgba(0,0.3);
    border-style: solid;
    display: inline-block;
  }

HTML 代码

 <input type="number" placeholder="enter height of div" id="div_height" />
<input type="number" placeholder="enter width of div" id="div_width" />
<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

JAVASCRIPT

      function myFunction() {
    let height_div = document.getElementById('div_height').value;
    let width_div = document.getElementById('div_width').value;
   
    var xy = '',i,size = 20;

    var x = screen.availHeight;
    var y = screen.availWidth;

    while (x > height_div) {
      while (y > width_div) {
        xy = xy + '<div>' + '</div>';
        y = y - width_div;
      }

      x = x - height_div;
    }
    document.getElementById('demo').innerHTML = xy;
    console.log(height_div + ' ' + width_div);
document.getElementsByTagName('div').style.height = height_div + 'px';
document.getElementsByTagName('div').style.width = width_div + 'px';

输出

enter image description here

解决方法

尝试使用此代码：

div
{
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

然后它会覆盖整个屏幕。

function myFunction(e) {
  e.preventDefault()
  let height_div = document.getElementById("div_height").value;
  let width_div = document.getElementById("div_width").value;

  var xy = "";

  const xi = Math.floor(window.innerWidth / width_div);
  const yi = Math.floor(window.innerHeight / height_div);

  for (let i = 0; i < yi; i++) {
    xy += "<div class='row'>";
    for (let j = 0; j < xi; j++) {
      xy += "<div></div>"
    }
    xy += '</div>'
  }
  console.log(xy)
  document.getElementById("demo").innerHTML = xy;
  console.log(height_div + " " + width_div);
  Array.from(document.getElementsByTagName("div")).map(el => (el.style.height = height_div + "px"));
  Array.from(document.getElementsByTagName("div")).map(el => (el.style.width = width_div + "px"));
}
document.querySelector("form").addEventListener('submit',myFunction);

div {
  box-sizing: border-box;
  height: 200px;
  width: 200px;
  background-color: red;
  box-shadow: 2px 2px 8px rgba(0,0.3);
  border-style: solid;
  flex-grow: 0;
  flex-shrink: 0;
}

.row {
  display: flex;
}

p#demo {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  margin: 0;
  z-index: 1;
}

.form {
  background: blue;
  position: relative;
  z-index: 2;
}

<form class="form">
  <input type="number" placeholder="enter height of div" id="div_height" />
  <input type="number" placeholder="enter width of div" id="div_width" />
  <button>Try it</button>
</form>

<p id="demo"></p>

尝试这样的事情，如果你想填补空白并有一点宿醉，你可以使用Math.ceiling

division html javascript