复制代码 代码如下:

<script type="text/javascript" language="javascript">

var wait = 60;

function change() {

$o = $("#J_refresh_checkcode");

if(wait == 0) {

$o.removeAttr("disabled");

$o.html("看不清？换一张");

wait = 60;

} else {

$o.attr("disabled", true);

$o.attr("font-color", "gray");

$o.html(wait + "秒后可重新获取");

wait--;

if(wait == 59) {

var imgNode = document.getElementById("vimg");

imgNode.src = "../../AjaxServer/CheckCodePic.ashx?t=" + (new Date()).valueOf(); // 这里加个时间的参数是为了防止浏览器缓存的问题

$("#J_checkcode_tip").addClass("hide");

$("#J_checkcode_tip>div").html("");

$("#<%=hidPicMessage.ClientID%>").val("");

}

setTimeout(function() {

change()

},

1000)

}

}</script>

则 html如下：

复制代码 代码如下:

<div>

<span>验证码</span>

<input name="checkCode" id="J_checkcode_input" onmousedown="ClearCodeMessage()" type="text" maxlength="6" autocomplete="off" onblur="CheckCode()" />

<img src="../../AjaxServer/CheckCodePic.ashx" height="28" id="vimg" alt=""/>

<a id="J_refresh_checkcode">看不清，换一张</a>

<div id="J_checkcode_tip">

<div>

<i></i>

<div>

</div>

</div>

</div>

</div>