Factory
Factory类似Construct函数；
是用于构建一个类对象的函数；
返回一个object；C
function MemberFactory(){
this.createMember = function(name,type){
let member;
if(type === 'simple'){
member = new SimpleMembership(name);
}else if(type ==='standard'){
member = new StandardMembership(name);
}else if
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