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HTML-按显示隐藏和取消隐藏div无

display css html

0

darkchampionz · 技术社区 · 8 年前

我想做一场秀&隐藏 div .我使用的教程来自 w3schools ( https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_toggle_hide_show )但在这里,div已经显示出来了,然后你把它隐藏起来,而我的div是隐藏起来的,然后再显示出来。所以在这个例子中,我只是添加 display: none; 到 #myDIV :

<!DOCTYPE html>
<html>

<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <style>
    #myDIV {
      width: 100%;
      padding: 50px 0;
      text-align: center;
      background-color: lightblue;
      margin-top: 20px;
      display: none;
    }
  </style>
</head>

<body>

  <p>Click the "Try it" button to toggle between hiding and showing the DIV element:</p>

  <button onclick="myFunction()">Try it</button>

  <div id="myDIV">
    This is my DIV element.
  </div>

  <p><b>Note:</b> The element will not take up any space when the display property set to "none".</p>

  <script>
    function myFunction() {
      var x = document.getElementById("myDIV");
      if (x.style.display === "none") {
        x.style.display = "block";
      } else {
        x.style.display = "none";
      }
    }
  </script>

</body>

</html>

当我第一次单击 Try it 按钮,然后 部门 不显示。。。为什么?从那时起,如果我重新单击它,它会正常显示和消失。。。我怎样才能解决这个问题?泰

2 回复 | 直到 8 年前

1

2

Saeed 8 年前

因为第一次, x.style.display 未定义!

将您的条件修改为 if (x.style.display === "none" || !x.style.display)

<!DOCTYPE html>
<html>

<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <style>
    #myDIV {
      width: 100%;
      padding: 50px 0;
      text-align: center;
      background-color: lightblue;
      margin-top: 20px;
      display: none;
    }
  </style>
</head>

<body>

  <p>Click the "Try it" button to toggle between hiding and showing the DIV element:</p>

  <button onclick="myFunction()">Try it</button>

  <div id="myDIV">
    This is my DIV element.
  </div>

  <p><b>Note:</b> The element will not take up any space when the display property set to "none".</p>

  <script>
    function myFunction() {
      var x = document.getElementById("myDIV");
      if (x.style.display === "none" || !x.style.display) {
        x.style.display = "block";
      } else {
        x.style.display = "none";
      }
    }
  </script>

</body>

</html>

2

0

Dino the Dinosaur 8 年前

在已设置的#myDIV下 display: none 删除该行,它将自动显示