​x
 
<!DOCTYPE html>
<html>
<body>
​
获取图像：<input type="file" id="myFile">
​
<p>单击下面的按钮可禁用上面的 FileUpload 按钮。</p>
​
<button onclick="myFunction()">试一试</button>
​
<script>
function myFunction() {
  document.getElementById("myFile").disabled = true;
}
</script>
​
</body>
</html>
​