JavaScript 怎样知道在数组中点击的是什么元素

为此，你可以使用addEventListener()。

示例

以下是代码 –

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Document</title>
</head>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<body>
</body>
<script>
   var addButton;
   for (let i = 0; i < 3; i++) {
      addButton = document.createElement('button')
      if (i == 0) {
         addButton.innerHTML = "Javascript"
         addButton.dataset.subject = "Javascript"
         document.body.appendChild(addButton)
      }
      if (i == 1) {
         addButton.innerHTML = "MySQL"
         addButton.dataset.subject = "MySQL"
         document.body.appendChild(addButton)
      }
      if (i == 2) {
         addButton.innerHTML = "Java"
         addButton.dataset.subject = "Java"
         document.body.appendChild(addButton)
      }  
      addButton.addEventListener('click', function (evnt) {
         console.clear();
         console.log('Subject ' + evnt.target.dataset.subject + ' pressed')
      })
   }
</script>
</html>