​x
 
<!DOCTYPE html>
<html>
<body>
​
获取图像：<input type="file" id="myFile">
<br>
​
<button onclick="disableBtn()">禁用文件上传</button>
<button onclick="undisableBtn()">取消禁用文件上传</button>
​
<script>
function disableBtn() {
  document.getElementById("myFile").disabled = true;
}
​
function undisableBtn() {
  document.getElementById("myFile").disabled = false;
}
</script>
​
</body>
</html>
​