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Example analysis of using output tag to mark JavaScript return value

黄舟Original: 2017-07-03 10:35:481600browse

Sometimes some data information on the page is filled in after calculation through js. In the past, developers would often treat the 45a2772a6b6107b401db3c9b82c049c2 element as a placeholder and specify an ID attribute so that the JavaScript code could Find it and fill in the data. In
HTML5, it is recommended to use be6d67dae90cc1ad6469079e163d0939 as a placeholder to make the semantics clearer. The actual usage is the same as the previous 45a2772a6b6107b401db3c9b82c049c2 of.

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>随机数生成</title>
  <script>
    function run(){
        var resultElement = document.getElementById("result");
        resultElement.value = Math.random();
    }
  </script>
</head>
<body>
  <p>随机数：<output id="result"></output></p>
  <input type="button" value="生成" onclick="run()">
</body>
</html>

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