W3Schools 在线编辑工具（TIY） V3.0
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<html> <body> <form> I have a bike: <input id="bike" alt="bike" type="checkbox" name="Bike" /> <br /> I have a car: <input id="car" alt="car" type="checkbox" name="Car" /> </form> <p>The alt text for the checkboxes are: <script type="text/javascript"> document.write(document.getElementById('bike').alt); document.write(" and "); document.write(document.getElementById('car').alt); </script></p> </body> </html>