​x
 
<!DOCTYPE html>
<html>
<body>
​
<img id="myImg" src="/i/photo/tulip.jpg" style="width:300px;height:300px;">
<br>
​
<button type="button" onclick="myFunction()">返回图像高度</button>
​
<script>
function myFunction() {
  alert(document.getElementById("myImg").style.height);
}
</script>
​
</body>
</html>
​