验证码的安全性

 

 

 

html部分

 <div class="control-group">
                    <label class="control-label" for="inputPassword">验证码</label>
                    <div class="controls">
                      <input type="text" id="verify" class="span3" placeholder="请输入验证码"  errormsg="请填写5位验证码" nullmsg="请填写验证码" datatype="*5-5" name="verify">
                      <a href="javascript:;" class="reloadverify_a">换一张?</a>
                    </div>
                  </div>

 

 

js部分：

$(function(){
   var verifyimg = $(".verifyimg").attr("src");
            $(".reloadverify,.reloadverify_a").click(function(){

                if( verifyimg.indexOf('?')>0){
                    $(".verifyimg").attr("src", verifyimg+'&random='+Math.random());
                }else{
                    $(".verifyimg").attr("src", verifyimg.replace(/\?.*$/,'')+'?'+Math.random());
                }

            });
  });