验证码图片刷新图片的方法

【1】：直接在img属性中：设置onclick事件为：onclick="this.src=this.src+'?'"

【2】：用js代码实现

1.<div>  
2.    <p>  
3.        <span>请计算 </span><span class="redcolor">  
4.            <img src="<%= MixApplication.Instance.RelativePath %>/User/Register/MVerCode.aspx"  
5.                align="middle" style="position: inherit" id="Mcode"  />&nbsp; </span><span>看不清？ </span>  
6.        <a href="javascript:RefreshMcode();">换一张</a>  
7.    </p>  
8.</div>  

 

<script type="text/javascript">   
2.    function RefreshMcode() {   
3.        var num = Math.random();   
4.        var MvefCode = $("#Mcode");   
5.        MvefCode .src = "<%= MixApplication.Instance.RelativePath %>/User/Register/MVerCode.aspx?" + num ;   
6.    }   
7.</script>