本文实例讲述了javascript设计模式 – 建造者模式原理与应用。分享给大家供大家参考，具体如下：介绍：建造者模式又称为生成器模式，它是一种较为复杂、使用频率相对较低的创建型模式。建造者模式为客户端返回的不是一个简单的产品，而是一个由多个部件组成的复杂产品介绍：定义：将一个复杂对象的构建与他的表示分离，使得同样的构建过程可以创建不同的表示。建造者模式是一种对象创建型模式。定义：示例：示例：
var Dialog = function (){

this.type = '';

this.name = '';

this.element = '';

this.show = function(){

console.log(this.name + ': ' + this.type + this.element);

}
}

var noticeBuilder = function(){

this.dialog = new Dialog();

this.setType = function(){

this.dialog.type = 'notice';

}

this.setName = function(){

this.dialog.name = '公告';

}

this.setElement = function(){

this.dialog.element = '
notice
';

}

this.getDialog = function(){

return this.dialog;

}
}

var toastBuilder = function(){

this.dialog = new Dialog();

this.setType = function(){

this.dialog.type = 'toast';

}

this.setName = function(){

this.dialog.name = '提示';

}

this.setElement = function(){

this.dialog.element = '
toast
';

}

this.getDialog = function(){

return this.dialog;

}
}

function construct(ab){

ab.setType();

ab.setName();

ab.setElement();

return ab.getDialog();
}

var notice = new noticeBuilder();
var toast = new toastBuilder();
var noticeIns = construct(notice);
var toastIns = construct(toast);

noticeIns.show(); //公告: notice
notice

toastIns.show(); //提示: toast
toast



var Dialog = function (){

this.type = '';

this.name = '';

this.element = '';

this.show = function(){

console.log(this.name + ': ' + this.type + this.element);

}
}

var noticeBuilder = function(){

this.dialog = new Dialog();

this.setType = function(){

this.dialog.type = 'notice';

}

this.setName = function(){

this.dialog.name = '公告';

}

this.setElement = function(){

this.dialog.element = '
notice
';

}

this.getDialog = function(){

return this.dialog;

}
}

var toastBuilder = function(){

this.dialog = new Dialog();

this.setType = function(){

this.dialog.type = 'toast';

}

this.setName = function(){

this.dialog.name = '提示';

}

this.setElement = function(){

this.dialog.element = '
toast
';

}

this.getDialog = function(){

return this.dialog;

}
}

function construct(ab){

ab.setType();

ab.setName();

ab.setElement();

return ab.getDialog();
}

var notice = new noticeBuilder();
var toast = new toastBuilder();
var noticeIns = construct(notice);
var toastIns = construct(toast);

noticeIns.show(); //公告: notice
notice

toastIns.show(); //提示: toast
toast


在建造者模式中，客户端需要通过指挥类（construct方法）一步一步建造一个完整的产品，相同的构造过程可以创建完全不同的产品。建造者模式可以将复杂对象的构建与其表示相分离，使用相同构建过程可以创建不同的表示层，用户只需要指定需要建造的类型就可以，而具体的建造过程和细节就不需要知道了。为了简化系统结构，去掉construct参数，可以将construct合并到builder：
var Dialog = function (){

this.type = '';

this.name = '';

this.element = '';

this.show = function(){

console.log(this.name + ': ' + this.type + this.element);

}
}
var Construct = function(){

this.construct = function(){

this.setType();

this.setName();

this.setElement();

return this.getDialog();

}
}

var noticeBuilder = function(){

this.dialog = new Dialog();

this.setType = function(){

this.dialog.type = 'notice';

}

this.setName = function(){

this.dialog.name = '公告';

}

this.setElement = function(){

this.dialog.element = '
notice
';

}

this.getDialog = function(){

return this.dialog;

}
}

var toastBuilder = function(){

this.dialog = new Dialog();

this.setType = function(){

this.dialog.type = 'toast';

}

this.setName = function(){

this.dialog.name = '提示';

}

this.setElement = function(){

this.dialog.element = '
toast
';

}

this.getDialog = function(){

return this.dialog;

}
}
noticeBuilder.prototype = new Construct();
toastBuilder.prototype = new Construct();

var notice = new noticeBuilder();
var toast = new toastBuilder();
var noticeIns = notice.construct();
var toastIns = toast.construct();

noticeIns.show(); //公告: notice
notice

toastIns.show(); //提示: toast
toast

var Dialog = function (){

this.type = '';

this.name = '';

this.element = '';

this.show = function(){

console.log(this.name + ': ' + this.type + this.element);

}
}
var Construct = function(){

this.construct = function(){

this.setType();

this.setName();

this.setElement();

return this.getDialog();

}
}

var noticeBuilder = function(){

this.dialog = new Dialog();

this.setType = function(){

this.dialog.type = 'notice';

}

this.setName = function(){

this.dialog.name = '公告';

}

this.setElement = function(){

this.dialog.element = '
notice
';

}

this.getDialog = function(){

return this.dialog;

}
}

var toastBuilder = function(){

this.dialog = new Dialog();

this.setType = function(){

this.dialog.type = 'toast';

}

this.setName = function(){

this.dialog.name = '提示';

}

this.setElement = function(){

this.dialog.element = '
toast
';

}

this.getDialog = function(){

return this.dialog;

}
}
noticeBuilder.prototype = new Construct();
toastBuilder.prototype = new Construct();

var notice = new noticeBuilder();
var toast = new toastBuilder();
var noticeIns = notice.construct();
var toastIns = toast.construct();

noticeIns.show(); //公告: notice
notice

toastIns.show(); //提示: toast
toast
建造者模式总结：建造者模式总结：优点：
* 建造者模式中，客户端不需要知道产品内部组成的细节，将产品使用与其创建解耦，使得相同创建过程可以创建不同的产品对象
* 每个具体的建造类都相对独立，方便替换和新增，满足开关原则优点：
缺点：
* 建造者模式需要多个产品存在相同的创建流程，如果产品差异性大，就不适用建造者模式。
* 如果产品内部结构复杂多变，就需要定义很多建造类来实现这种变化，会导致系统变得庞大缺点：感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具：http://tools./code/HtmlJsRun测试上述代码运行效果。在线HTML/CSS/JavaScript代码运行工具在线HTML/CSS/JavaScript代码运行工具http://tools./code/HtmlJsRun关于JavaScript相关内容感兴趣的读者可查看本站专题：《javascript面向对象入门教程》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》javascript面向对象入门教程JavaScript错误与调试技巧总结JavaScript数据结构与算法技巧总结JavaScript遍历算法与技巧总结JavaScript数学运算用法总结希望本文所述对大家JavaScript程序设计有所帮助。