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JS 参考手册
Input Email placeholder 属性
tryjsref_email_placeholder
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<!DOCTYPE html> <html> <body> E-mail: <input type="email" id="myEmail" placeholder="Email adr"> <p>Click the button to change the placeholder text of the email field.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myEmail").placeholder = "Your email address"; } </script> </body> </html>