jQuery Validate：http://www.runoob.com/jquery/jquery-plugin-validate.html

$("#LinkCommentForm").validate({        rules: {            fname: "required",            sitename: {                required: true,                minlength: 10            },            siteurl: {                required: true,                minlength: 2,                url: true            },            SiteEmail: {                required: true,                email: true            }        },        messages: {            rurl: "Please enter your rurl",            sitename: {                required: "Please provide a sitename",                minlength: "Your password must be at least 5 characters long"            },            siteurl: {                required: "Please enter a siteurl",                minlength: "Your username must consist of at least 2 characters",            },            SiteEmail: "Please enter a valid email address"                    },        showErrors: function (errorMap, errorList) {                        swal({ title: "Here's a message!", text: errorList[0].message, timer: 2000, showConfirmButton: false });            $(errorList[0].element).focus();},        onfocusout:false,onkeyup:false,     });