编辑代码:
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<!DOCTYPE html> <html> <body> First Name: <input type="text" id="myText" placeholder="Name"> <p>Click the button to change the placeholder text of the text field.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myText").placeholder = "Type name here.."; } </script> </body> </html>