var data =http://www.mamicode.com/ {        "username" : "zhangsan",        "password" : "12345690",        "code" : "abcd"    };    var validate = {        rules : {},        config : {},        msg : [],        check : function(data){            var k, rule, config, checker;            rule = this.rules;            config = this.config;            this.msg.length = 0;            for(k in data){                if(data.hasOwnProperty(k)){                    if(!rule[k]){                        throw new Error("validate.check error, error type: " + k + " not exist");                    }                    checker = this.rules[k];                    if(!checker.validate(data[k])){                        this.msg.push(checker.msg);                    }                }            }        }    };    validate.rules.username = {        validate : function(username){            return username.length > 7;        },        msg : "用户名有误"    };    validate.rules.password = {        validate : function(password){            return password.length > 7        },        msg : "密码挂了"    };    validate.rules.code = {        validate : function(code){            return code === "abcdef";        },        msg : "验证码不对"    };    validate.check(data);    if(validate.msg.length){        console.log(validate.msg.join("\n"));    }