jQuery验证插件 Validate详解(5)

 <p>
     <label for="cvalcode">验证码</label>
     <input id="valcode" name="valcode"  />=7+9
   </p>

$.validator.addMethod("formula",function(value,element,param){
      return value==eval(param)
    },"请正确输入验证信息");

$.validator.addMethod("formula",function(value,element,param){
      return value==eval(param)
    },"请正确输入验证信息");
    $("#commentForm").validate({
      rules:{
        username:{
          required:true,
          minlength:2
        },
        email:{
          required:true,
          email:true
        },
        url:"url",
        comment:"required",
        valcode: {
          formula: "7+9" 
        }
      },
      messages:{
        username:{
          required:"主人,我要填的满满的",
          minlength:"哎唷,长度不够耶"
        }
      },
      errorElement:"em",
      success:function(label){
        label.text(" ").addClass('success')
      }
    });