设置按钮的宽度 - 在线编辑器

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function displayResult() {
      document.getElementById("b1").style.width = "300px";
    }
  </script>
</head>
<body>

  <input type="button" id="b1" onclick="displayResult()" value="修改按钮的宽度">

</body>
</html>
​x
 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function displayResult() {
      document.getElementById("b1").style.width = "300px";
    }
  </script>
</head>
<body>
​
  <input type="button" id="b1" onclick="displayResult()" value="修改按钮的宽度">
​
</body>
</html>