样例代码:
<form action="https://www.freecatphotoapp.com/submit-cat-photo">
<input type="text" placeholder="cat photo URL">
<button type="submit">Submit</button>
</form>
运行结果:

image.png
<form action="https://www.freecatphotoapp.com/submit-cat-photo">
<input type="text" placeholder="cat photo URL">
<button type="submit">Submit</button>
</form>