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 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">请输入图片中的四个字母。</span>
<span id="codeInfo" style="color:red"></span>
<a href="#" id="imgchange" onclick="changeImage()">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。