1.2.8.5.增加 jQuery 支援

// 原型物件中的this會指向物件本身
    Greetr.prototype = {
        fullName: function(){
            return this.firstname + ' ' + this.lastname;
        },
        validate: function(){
           if (supportedLangs.indexof(this.language) === -1) {
               throw "Invalid language";
           }
        },
        greeting: function() {
            return greetings[this.language] + this.fistname + '!';
        },
        formalGreeting: function() {
            return formalGreetings[this.language] + this.fistname + '!';
        },
        //可鍊結的方法
        greet: function(formal) {
            var msg;
            if (formal) {
                msg = this.formalGreeting();
            } else {
                msg = this.greeting();
            }

            if (console) {
                console.log(msg);
            }
            return this
        },
        log: function() {
            if (console) {
                console.log(logMessage[this.language]);
            }
            return this;
        },
        setLang: function(lang) {
            this.language = lang;
            this.validate();
        },
        //jQuery method
        HTMLGreeting:function(selector, formal) {
            if (!$) {
                throw 'jQuery not loaded';
            }
            if (!selector) {
                throw 'Missing jQuery selector';
            }
            var msg;
            if (formal) {
                msg = this.formalGreeting();
            } else {
                msg = this.greeting();
            }

            $(selector).html(msg);
            return this;
        },

    };