页面代码：
<div class="formControls col-8 col-offset-3">
<input class="input-text size-L" name="verfiy" type="text" placeholder="验证码" onblur="if(this.value==''){this.value='验证码:'}" onclick="if(this.value=='验证码:'){this.value='';}" value="验证码:" style="width:150px;">
<img src="<{:U('Login/verfiy')}>"><a id="code" href="javascript:;">看不清，换一张</a> </div>
</div>JQ代码:
<script type="text/javascript">
//点击刷新
$("#code").on("click", function () {
$(this).prev().attr("src","<{:U(MODULE_NAME .'/Login/verfiy')}>/" + Math.random());
})
//获取焦点 验证刷新
$("input[name=verfiy]").focus(function () {
$("#code").trigger('click');
});
</script>
