jQuery/AJAX基础：异步加载与表单验证

ajax(jquery)ѧϰ¶þ.1 
// hide error label and remove error class on focus if enabled
    if ( this.settings.focusCleanup && !this.blockFocusCleanup ) {
     this.settings.unhighlight && this.settings.unhighlight.call( this, element, this.settings.errorClass, this.settings.validClass );
     this.errorsFor(element).hide();
    }
   },
   onfocusout: function(element) {
    if ( !this.checkable(element) && (element.name in this.submitted || !this.optional(element)) ) {
     this.element(element);
    }
   },
   onkeyup: function(element) {
    if ( element.name in this.submitted || element == this.lastElement ) {
     this.element(element);
    }
   },
   onclick: function(element) {
    if ( element.name in this.submitted )
     this.element(element);
   },
   highlight: function( element, errorClass, validClass ) {
    $(element).addClass(errorClass).removeClass(validClass);
   },
   unhighlight: function( element, errorClass, validClass ) {
    $(element).removeClass(errorClass).addClass(validClass);
   }
}, 
// http://docs.jquery.com/Plugins/Validation/Validator/setDefaults
setDefaults: function(settings) {

   $.extend( $.validator.defaults, settings );
},

messages: {
   required: "This field is required.",
   remote: "Please fix this field.",
   email: "Please enter a valid email address.",
   url: "Please enter a valid URL.",
   date: "Please enter a valid date.",
   dateISO: "Please enter a valid date (ISO).",
   dateDE: "Bitte geben Sie ein g¨¹ltiges Datum ein.",
   number: "Please enter a valid number.",
   numberDE: "Bitte geben Sie eine Nummer ein.",
   digits: "Please enter only digits",
   creditcard: "Please enter a valid credit card number.",
   equalTo: "Please enter the same value again.",
   accept: "Please enter a value with a valid extension.",
   maxlength: $.validator.format("Please enter no more than {0} characters."),
   minlength: $.validator.format("Please enter at least {0} characters."),
   rangelength: $.validator.format("Please enter a value between {0} and {1} characters long."),
   range: $.validator.format("Please enter a value between {0} and {1}."),
   max: $.validator.format("Please enter a value less than or equal to {0}."),
   min: $.validator.format("Please enter a value greater than or equal to {0}.")
},

autoCreateRanges: false,

prototype: {
  
   init: function() {