HTML DOM offsetLeft 属性

#test {
  left: 100px;
  top: 50px;
  margin: 10px;
  padding: 10px;
  width: 300px;
  position: relative;
  border: 5px solid black
}

<div id="test">
  <p>点击按钮获取 div 元素的位置:</p>
  <p><button onclick="myFunction()">点我</button></p>
  <p id="demo">offsetLeft: <br>offsetTop: </p>
</div>

script

function myFunction() {
  var testDiv = document.getElementById("test");
  var demoDiv = document.getElementById("demo");
  demoDiv.innerHTML = "offsetLeft: " + testDiv.offsetLeft + "
offsetTop: " + testDiv.offsetTop;
}