​x
 
<!DOCTYPE html>
<html>
<body>
​
<img id="myImg" src="/i/photo/beijing.jpg" style="width:750px;height:500px;">
​
<p>单击该按钮可返回图像的原始宽度和“新的/样式化的”宽度。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
<p id="demo2"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myImg").naturalWidth;
  document.getElementById("demo").innerHTML = "图像的原始宽度为：" + x + " pixels";
  
  var y = document.getElementById("myImg").width;
  document.getElementById("demo2").innerHTML = "图像的“样式化”宽度为：" + y + " pixels";
}
</script>
​
</body>
</html>
​