如何定量的信件,在上传提示,在css
<input maxlength="25" placeholder="name" />
html输入的最大vs maxlength
<input type="text" maxlength="4"/>
输入maxlength
<form action="/action_page.php">
<label for="username">Username:</label>
<input type="text" id="username" name="username" maxlength="10"><br><br>
<input type="submit" value="Submit">
</form>
最大的高度
max-height overrides height, but min-height always overrides max-height.