validate有一些使用心得

validate自定义方法使用
实例1：检测用户是否已经存在

$.validator.addMethod(        "checkUser",        function(value,element,params){            var isExisted = false;            $.ajax({                "async":false,                 "data":{"username":value},                "url":"${pageContext.request.contextPath}/checkUser",                "type":"POST",                "dataType":"json",                "success":function(data){                    isExisted = data.isExisted;                }            });                 return !isExisted;        }    );

实例2：验证码校验

$.validator.addMethod(    "isChecked",    function(value,element,params){        var checked = false;        $.ajax({            "async":false,             "data":{"code":value},            "url":"${pageContext.request.contextPath}/checkVCode",            "type":"POST",            "dataType":"json",            "success":function(data){                checked = data.checked;            }        });        return checked;}

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