多种添加公用方法的方式

/*
    //这样做并不好，污染了原生的Function
    Function.prototype.checkEmail = function(){
        //验证邮箱
        console.log(1);
    }

    var fn = function(){};
    fn.checkEmail();
    */

    //可以添加统一添加方法的功能方法
    /*
    Function.prototype.addMethod = function(name,fn){
        this[name] = fn;
    }
    var fn = function(){};
    fn.addMethod('checkName',function(){
        console.log('验证姓名');
    });
    fn.addMethod('checkEmail',function(){
        console.log('验证邮箱');
    });
    fn.checkName();
    fn.checkEmail();
    */
    //链式添加&&链式调用
    /*
    Function.prototype.addMethod = function(name,fn){
        this[name] = fn;
        return this;
    }
    var fn = function(){};
    fn.addMethod('checkName',function(){
        console.log('检查名字');
        return this;
    }).addMethod('checkEmail',function(){
        console.log('检查邮件');
        return this;
    });

    fn.checkName().checkEmail();

    */
    //类式调用方式
    Function.prototype.addMethod = function(name,fn){
        this.prototype[name] = fn;//赋值到对象的原型上
    }

    var fn = function(){};
    fn.addMethod('checkName',function(){
        console.log('检查名字');
    });
    fn.addMethod('checkEmail',function(){
        console.log('检查邮箱');
    });

    var methods = new fn();
    methods.checkName();
    methods.checkEmail();