使用size属性来设置HTML中
示例
您可以尝试运行以下代码来实现size属性 -
<!DOCTYPE html>
<html>
<body>
<p>Select the countries you have visited till now,</p>
<select size = "5">
<option value = "india">India</option>
<option value = "us">US</option>
<option value = "canada">Canada</option>
<option value = "aus">Australia</option>
<option value = "bangladesh">Bangladesh</option>
</select>
</body>
</html>