Javascript防止表单重复提交

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Javascript防止表单重复提交

先写一个提交页面，form.html，如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>form.html</title>    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="this is my page">    <meta http-equiv="content-type" content="text/html; charset=UTF-8">        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->  </head>    <body>    <form action="/Day07/servlet/DoFormServlet">    用户名：<input type="text" name="username">    <input type="submit" value="提交">    </form>  </body></html>

再写DoFormServlet.java，如下：

package cn.itcast.form;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class DoFormServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String username =request.getParameter("username");try {Thread.sleep(3*1000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("想数据库中注册数据......");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

当你再浏览器中输入http://localhost:8088/Day07/form.html，出现表单，随便输入几个字母，然后在3秒内点击提交3次。

在Myeclipse的输出栏中打印如下：

想数据库中注册数据......
想数据库中注册数据......
想数据库中注册数据......

用javascript 代码解决，改动