完整代码：
1 <!DOCTYPE html> 2 <html> 3 <head> 4 </head> 5 6 <body> 7 <div style="font-size:16px;float:left ;"> 8 <label class="text">内容 9 <input type="text" id="key" name="key" 10 placeholder="请输入"></label> 11 <button type="button" onclick="clearText()">清空</button> 12 </div> 13 </body> 14 15 {#地址根据实际的路径填写#} 16 <script type="text/javascript" src="xxxxx/js/jquery.min.js"></script> 17 <script type="text/javascript" language="javascript"> 18 function clearText() { 19 $(\'.text input\').val(\'\'); 20 } 21 </script> 22 23 </html>