Method of Realizing src Update Request in img by Combining JSP with js

This paper describes the method of src update request in img by combining JSP with js. Share it for your reference. The details are as follows:

1. javascript (updated function)

<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. Code for img and img changes in jsp

<td> 
  <img class="yzm_img" id='imgVcode' name="1" src="shop.do?method=registerImage" />
  <input name="code" type="text" id="txtVerifyCode" 
    class="yzm_input" onblur="testCode(this)"/>
  <div class="text_left t1">
    <p class="t1">
      <span id="vcodeValidMsg"> Please enter the 4 Three letters. </span> 
      <span id="codeInfo" style="color:red"></span> 
      <a href="#" id="imgchange" onclick="changeImage()"> Can't see clearly? Change the picture </a>
    </p> 
  </div> 
</td>

3. Background action code

public ActionForward registerImage(ActionMapping mapping, ActionForm form, 
   HttpServletRequest request, HttpServletResponse response)
    throws Exception { 
    // Will image Create , Return authentication code  
    response.setContentType("image/jpeg"); 
    OutputStream out = response.getOutputStream(); 
    String strEnsure = shopManager.createImageInfo(50,20,out);
    // Set to session Medium  
    request.getSession().setAttribute("strEnsure", strEnsure);
    return null; 
  } 
  public ActionForward registerImage2(ActionMapping mapping, ActionForm form, 
      HttpServletRequest request, HttpServletResponse response)
      throws Exception { 
    // Will image Create , Return authentication code  
    response.setContentType("image/jpeg"); 
    OutputStream out = response.getOutputStream(); 
    String strEnsure = shopManager.createImageInfo(50,20,out);
    // Set to session Medium  
    request.getSession().setAttribute("strEnsure", strEnsure);
    return null; 
} 

I hope this article is helpful to everyone's JavaScript programming.