本文实例讲述了JSP结合js实现img中src更新请求的方法。分享给大家供大家参考。具体如下：

1.javascript(更新的函数)

<script type="text/javascript"> function changeImage(){ var img = document.getElementById("imgVcode"); if(img.name == 1){ img.name = 2; img.src = "shop.do?method=registerImage2"; }else if(img.name == 2){ img.name = 1; img.src = "shop.do?method=registerImage"; } } </script>

2.jsp中img和img改变的代码

<td> <img id='imgVcode' name="1" src="shop.do?method=registerImage" /> <input name="code" type="text" id="txtVerifyCode" onblur="testCode(this)"/> <div> <p> <span id="vcodeValidMsg">请输入图片中的四个字母。</span> <span id="codeInfo"></span> <a href="#" id="imgchange">看不清楚？换个图片</a> </p> </div> </td>

3.后台action代码

public ActionForward registerImage(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { //将image创建,返回认证码 response.setContentType("image/jpeg"); OutputStream out = response.getOutputStream(); String strEnsure = shopManager.createImageInfo(50,20,out); //设置到session中 request.getSession().setAttribute("strEnsure", strEnsure); return null; } public ActionForward registerImage2(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { //将image创建,返回认证码 response.setContentType("image/jpeg"); OutputStream out = response.getOutputStream(); String strEnsure = shopManager.createImageInfo(50,20,out); //设置到session中 request.getSession().setAttribute("strEnsure", strEnsure); return null; }

希望本文所述对大家的JavaScript程序设计有所帮助。