通过单击按钮逐步增加元素的大小

<div id="element"></div>
<button onclick="increaseSize()">增加大小</button>

#element {
  width: 100px;
  height: 100px;
  background-color: #ccc;
}

function increaseSize() {
  var element = document.getElementById("element");
  var currentWidth = element.offsetWidth;
  var currentHeight = element.offsetHeight;
  
  // 增加元素的大小
  var newWidth = currentWidth + 10;
  var newHeight = currentHeight + 10;
  
  // 应用新的大小
  element.style.width = newWidth + "px";
  element.style.height = newHeight + "px";
}