textarea如何實現水印提示

要實現水印提示，可以通過在標簽中使用placeholder屬性來添加水印提示。placeholder屬性允許您在文本框中顯示灰色文本，以指示用戶應該輸入的內容。</p> <p>示例代碼如下：</p> <pre class="hljs"><code><span id="pl5zbpn5v5" class="hljs-tag"><<span id="pl5zbpn5v5" class="hljs-name">textarea</span> <span id="pl5zbpn5v5" class="hljs-attr">placeholder</span>=<span id="pl5zbpn5v5" class="hljs-string">"請輸入您的內容"</span>></span><span id="pl5zbpn5v5" class="hljs-tag"></<span id="pl5zbpn5v5" class="hljs-name">textarea</span>></span> </code></pre> <p>這樣，當用戶未輸入任何內容時，文本框中會顯示灰色的“請輸入您的內容”提示文字，一旦用戶開始輸入內容，水印提示就會消失。這是一種簡單而有效的方法來實現水印提示。</p> </p> </div> <p class="tj-wenzhang recommend-article"></p> <div id="pl5zbpn5v5" class="zixun-tj-product adv-bottom"></div> <div id="pl5zbpn5v5" class="user-estimate clearfix"> <div id="pl5zbpn5v5" class="like"><i></i><span>0</span> 贊</div> <div id="pl5zbpn5v5" class="dislike"><i></i><span>0</span> 踩</div> </div> </div> </div> <div id="pl5zbpn5v5" class="prve-next-qanews"> <ul> </ul> </div> <div id="pl5zbpn5v5" class="hot-answer"> <div 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