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實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<p>该实例演示了如何向表单元素添加 "onsubmit" 事件。</p>
<p>当提交表单是，触发函数并弹出提示信息。</p>
<form action="demo-form.php" onsubmit="myFunction()">
    输入名字: <input type="text" name="fname">
    <input type="submit" value="提交">
</form>
<script>
function myFunction() {
    alert("表单已提交");
}
</script>
</body>
</html>
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