如何在 aa 页面上获取两个 jquery ui 滑块,当我将 id 滑块用于多个 div 时,仅显示第一个滑块
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link href="css/style.css" rel="stylesheet" />
<link rel="stylesheet" href="css/jquery-ui.css" />
<script src="js/jquery-1.9.1.js"></script>
<script src="js/jquery-ui.js"></script>
.
.
.
.
.
<div id="left_panel">
<div id="panel_title">
Left Panel
</div>
<textarea id="txt" > </textarea>
<input type="checkbox" name="right_to_left" value="Bike">
Right to Left
<br/>
<div id="font_family">
<!--[if !IE]> -->
<div class="notIE">
<!-- <![endif]-->
hello
<select>
<option>Apples</option>
<option selected>Pineapples</option>
<option>Chocklate</option>
<option>Pancakes</option>
</select>
<!--[if !IE]> -->
</div>
<!-- <![endif]-->
</div>
<br/>
Size:<div class="font_size" class="slider"></div>
Opacity:<div class="font_opacity" class="slider"></div>
</div>
<div id="middle_panel">
I am in middle
</div>
</div>
</div>
</body>
请建议?html