【请大家移步新教程，20220201】基于RPGMakerMV的JavaScript基础 - Project1

把我以前写的一个教程再发一遍
如有谬误，尽请指教，不胜感激。
我尽量，慢慢更新吧，毕竟水平也不高。
另外，请大家多回复，争取把帖子一直顶在最前面。。。图书馆不肯收录我

想要小修一下以前的错误，2019/04/08。。。{:2_264:}

几年的功夫下来，RPGMaker的版本更新了好多，甚至都已经更新到MZ了，但是我自己还有由于各种各样的原因，没能正常的继续更新，维护此教程，实在感到愧对各位同仁。

还好我们有一位热心人愿意在我的基础上继续为大家带来新的教程，真是非常感谢，本人完全同意能够由 @RuanZhongNan 来继续接手维护这个系列教程。
新维护的教程链接：

https://hechicollegecomputerassociation.gitee.io/rpgmv-dev-notes/

另外接着新年之际，也希望社区能够越来越好，大家都能够作出自己心仪的游戏，生活顺利，事业有成！
2022/02/01

制作游戏需要专业的游戏引擎，这样可以事半功倍，若要想制作RPG类型的游戏，那么RPG Maker MV是一个不错的选择。

RPG Maker，又名RPG制作大师、RPGツークル、RPG Tsukuru。是一款Enterbrain Incorporation公司出品的RPG游戏制作工具，分为RPG Maker 2000，RPG Maker 2003，RPG Maker XP，RPG Maker VX，RPG Maker VX Ace，RPG Maker MV。

我们现在要介绍的是最新版的RPG Maker MV，这个版本可以实现的功能与前作基本一致，但最大的不同在于使用的语言由Ruby变成了JavaScript，以及由此带来的与html5结合的便利。

现在，我们可以借助html5+JavaScript，将制作的游戏部署到PC端，Android端，IOS端。通俗来讲，凡是可以浏览网页的设备，只要配置足够，都可以运行MV制作的游戏。

JavaScript是一种属于网络的脚本语言,已经被广泛用于Web应用开发,常用来为网页添加各式各样的动态功能,为用户提供更流畅美观的浏览效果。通常JavaScript脚本是通过嵌入在HTML中来实现自身的功能的。

实际上，我们的RPG Maker MV游戏本身就可以看做一个html组成的网站，因此，MV的游戏也需要使用JavaScript来实现其功能。可以说，网页制作使用的JavaScript和MV游戏制作使用的JavaScript没有什么不同。

但是，若要问JavaScript和java有什么关系，请参考雷锋与雷峰塔。记住这一点，不要把两者混用。

它最初由Netscape的Brendan Eich设计。 Netscape在最初将其脚本语言命名为LiveScript，后来Netscape在与Sun合作之后将其改名为JavaScript。JavaScript最初受Java启发而开始设计的，目的之一就是“看上去像Java”，因此语法上有类似之处，一些名称和命名规范也借自Java。但JavaScript的主要设计原则源自Self和Scheme。JavaScript与Java名称上的近似，是当时Netscape为了营销考虑与Sun微系统达成协议的结果。为了取得技术优势，微软推出了JScript来迎战JavaScript的脚本语言。为了互用性，Ecma国际（前身为欧洲计算机制造商协会）创建了ECMA-262标准（ECMAScript）。两者都属于ECMAScript的实现。尽管JavaScript作为给非程序人员的脚本语言，而非作为给程序人员的脚本语言来推广和宣传，但是JavaScript具有非常丰富的特性。

发展初期，JavaScript的标准并未确定，同期有Netscape的JavaScript，微软的JScript和CEnvi的ScriptEase三足鼎立。1997年，在ECMA（欧洲计算机制造商协会）的协调下，由Netscape、Sun、微软、Borland组成的工作组确定统一标准：ECMA-262。

我们使用JavaScript，也应当遵守标准。目前，js的最新标准是es6。

首先打开RPG Maker MV，打开一个工程，进入其根目录后可以看到，工程的结构如图1-1所示。

其中，js目录下即是JavaScript所在的地方，打开js，我们可以看到如图1-2，libs是MV的库，系统所用到的一些配置都在其中。plugins是游戏的插件所在地，放在这里面的js文件才能被当做插件加载。
其余的文件都是游戏的系统脚本，游戏程序的实现全靠这几部分。

libs文件夹下，其内容如图1-3所示。其中，fpsmeter.js用于帧数测试。lz-string.js用于大量数据存储。pixi.js用于HTML5 2D渲染。

我们用到最多的就是plugins文件夹，此文件夹下所有的文件都会反映在RPG Maker MV的插件管理器中，如图1-4，1-5所示。

这里，我们选择一个插件，EnemyBook，此插件的帮助文档显示了作者对使用者的提示，如图1-6。在我们自己写给自己用时，虽然当时不需要提示，但日子久了仍然会忘记一些功能的具体实现，因此，帮助文档是必不可少的。

双击parameters参数表中的项目，就可以配置插件的参数，如图1-7。这也是由插件制作者设计好的。可以依据提示自行设置插件允许的功能。

设置好之后，别忘了将status状态设置为on开启状态。这样，我们就可以使用该插件了。

现在，我们设置一个老爷爷，通过与他对话来打开EnemyBook怪物图鉴。其事件页面使用Plugin Command，在其中输入我们刚才在帮助文档中看到的命令。此处应该用打开怪物图鉴的命令EnemyBook Open，设置如图1-8。

测试游戏，可以看到，效果如图1-9所示，??????的符号正是我们刚才设置的不知道的怪物的显示名字。

现在，我们进行一次战斗，之后再看看会发生什么，如图1-10。

战斗之后再打开EnemyBook，然后会发现，其中的Bat已经可以查看了，如图1-11。

这就是插件的用法示例，通过学习，我们自己也可以设计并制作自己的插件。如果不想制作插件，学习JavaScript也有助于我们理解和使用插件，因为并不是每个制作者的帮助文档都写的简单明了。

如果我们要自己创建插件，只需要在pulgins文件夹下创建一个新的文本文件，将扩展名改为js，然后就可以调用了。

事实上，任何文本编辑器都可以打开并编辑后缀名为.js的JavaScript的脚本文件，但笔者在这里推荐使用专业的编辑器，比如notepad++，以及笔者用的visual studio code，如图1-12所示。
一个好的编辑器可以帮助你完成一些繁琐的任务，使得编程事半功倍。

事实上，我们在事件中除了可以使用插件定义好的插件命令外，还可以直接在事件中嵌套入JavaScript语句。如图1-13所示，在事件中插入脚本，即JavaScript语句，之后在游戏中可以通过事件来触发，如图1-14。

JavaScript是区分大小写的，也就是说，大写字母和小写字母会被认为是不同的部分，例如变量名rename，Rename以及RENAME是不同的三个变量，虽然它们看起来含义相同。

大多数情况下，JavaScript是忽略空白部分的，所以你可以使用空格键、制表键等来缩进代码，使其变得好看许多。例如图2-1中的两端代码，虽然功能是一样的，但是下面的部分明显比上面的部分简洁、清晰。要是隔两天你再来看，那么你愿意看哪一种呢？

注释必须好好写，注释必须好好写，注释必须好好写。（重要的事情说三遍）注释是帮助你理解的一部分文字，并不在代码中起作用。

c式的/*与*/，或者c++式的//都可以，其中/*和*/可以跨行注释其中的所有内容，//只能注释在它后面的这一行的内容。

分号对于JavaScript虽然不是必要的（事实上解释器会自动补全），但是这里推荐你老老实实的每句话后面加分号，否则会出现一些稀奇古怪的事情。

换行用于把两条语句隔开，以增加可读性，一样推荐你老老实实的换行，不要偷懒。另外，不要把一句话拆开两行。

if(con==1){
x=5;
}else{
x=8;
}

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事实上这两者没什么本质不同，你也不必要区分的那么仔细，我也不打算详细区别这两个东西。

ECMA-262 描述了一组具有特定用途的关键字。这些关键字可用于表示控制语句的开始或结束，或者用于执行特定操作等。按照规则，关键字也是语言保留的，不能用作标识符。以下就是ECMAScript的全部关键字（带*号上标的是第5 版新增的关键字）：

ECMA-262 还描述了另外一组不能用作标识符的保留字。尽管保留字在这门语言中还没有任何特定的用途。但它们有可能在将来被用作关键字。以下是ECMA-262 第3 版定义的全部保留字：

总之，这些词都不要使用做自己的变量名字就好，否则会跟系统预定义的功能起冲突。

变量需要起一个变量名。变量名须以字母、 $ 或 _ 符号开头，而且对大小写敏感。

建议大家平常都用字母开头，我个人比较讨厌美元和短命鬼。

使用变量前需要声明这个变量，我们使用var来声明一个变量，例如：

var a=5;
var b=10;
var c=a+b;
var pi=3.14;

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就像这样，我们就声明了一系列的变量，并且给他们赋了相应的值。也可以不赋值来声明一个变量，在后面的使用中再给它赋值，例如：

var m;
m=250;

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赋值要使用=，叫做赋值号，注意，这东西不是等号，不表示两个相等，只是把右边的值给左边，或者说把左边的变量设置成和右边一样的。

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JavaScript有字符串、数字、布尔、数组、对象、Null、Undefined这样几种基本数据类型。

而且，JavaScript拥有动态的数据类型，这意味着相同的变量可用作不同的类型，例如，前一刻它还是个数字，后面就变成字符串了：

var a;//声明一个变量a
a=5;//给a赋值5，此时a是个数字类型
a="hehe";//给a赋值“hehe”，此时a是个字符串类型

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一种比较特殊的（我不喜欢特殊……）类型，用引号包裹着的内容来表示。单引号可以，双引号也可以，例如：

var carname="Bill Gates";
var carname='Bill Gates';

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也可以用引号包裹引号，这种字符串是里面有引号的字符串，例如：

var answer="Nice to meet you!";
var answer="He is called 'Bill'";
var answer='He is called "Bill"';

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var x1=34.00; //使用小数点来写
var x2=34; //不使用小数点来写

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var y=123e5; // 12300000
var z=123e-5; // 0.00123

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数组就是一些变量的顺序组合，JavaScript中这样来创建一个数组：

var cars=new Array();
cars[0]="Audi";
cars[1]="BMW";
cars[2]="Volvo";

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var cars=new Array("Audi","BMW","Volvo");

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var cars=["Audi","BMW","Volvo"];

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数组的下表是从0开始的，你可以用[]里面加数字的形式来访问数组里面存储的数据。

对象由花括号分隔。在括号内部，对象的属性以名称和值对的形式 (name : value) 来定义。属性由逗号分隔：

var person={firstname:"Bill", lastname:"Gates", id:5566};

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上面例子中的对象 (person) 有三个属性：firstname、lastname 以及 id。

var person={
firstname : "Bill",
lastname : "Gates",
id : 5566
};

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对象的访问有两种形式，一种是使用.来访问，一种是使用[]来访问，例如：

name=person.lastname;
name=person["lastname"];

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undefined 这个值表示变量不含有值，可以通过将变量的值设置为 null 来清空变量，例如：

cars=null;
person=null;

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var carname=new String;
var x= new Number;
var y= new Boolean;
var cars= new Array;
var person= new Object;

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事实上，JavaScript中所有事物都是对象，对象就是拥有属性和方法的数据。

car.name=Fiat
car.model=500
car.weight=850kg
car.color=white

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car.start()
car.drive()
car.brake()

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同样，游戏中的人物也有生命值，攻击力等属性，也有攻击，防御，放火球等方法。这样，我们就可以把游戏中的人物当做一个对象来设计。

var txt = "Hello";

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你实际上已经创建了一个 JavaScript 字符串对象。字符串对象拥有已经按标准定义好的属性 length。对于上面的字符串来说，length 的值是 5。字符串对象同时拥有若干个内建的方法。

txt.length=5

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txt.indexOf()
txt.replace()
txt.search()

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除了使用JavaScript内建的几种对象外，我们还可以自己定制自己的对象，例如刚才说到的游戏人物，就可以像这样定义：

var person=new Object();
person.name="Xiao Rou"
person.hp=500;
person.atc=10;
person.def=5;
person.attack=function(){//……具体动作}

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person.attack()//执行person的attack方法
var a=person.atc//给a赋值person的atc属性

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在JavaScript中，函数用function来表示，是一种可以被调用的代码块，当你调用一个函数的时候，就会执行其中的代码。我们一般把会多次使用的语句组合在一起，形成一个函数，方便重复使用。

以下例子都可以采取事件中插入脚本的方法进行实际测试，定义好函数之后，一定要进行调用（请参看alert函数是怎么调用的）。

function hello(){
alert("Hello Xiao Rou!");
}

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由function打头，后面跟着给这个函数起的名字，之后是小括号，大括号里面是函数的内容，可以是任意的语句。例子中的alert也是一个函数，这个函数是js自带好的（准确的说是由浏览器标准BOM规定的，RPG Maker MV也支持），跟那些数据类型相似，我们可以直接使用它，用途就是弹出一个对话框，对话框里面显示的是小括号里面的内容，在这里是一个字符串"Hello Xiao Rou!"。

函数还可以向里面传入参数，函数里面可以调用传入的参数，像alert函数，它所要传入的参数就是一个字符串。我们可以像这样定义一个带参数的函数：

function square( x ){
var r=x*x;
alert(x+"’s square is"+r);
}

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这个例子是一个square函数，它有一个参数x，功能就是求x的平方，并且用alert显示出来。参数可以有多个，它们之间用逗号隔开。

函数还可以有返回值，所谓返回值，可以看做函数运行结束后就变成了一个值，用法如下：

function power( x , n ){
var r=1;
for(var i=1;i<=n;i++){
r=r*x;
}
return r;
}

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函数用return来传出返回值，同时return也是函数的终点，函数内部的语句执行的return的时候就会退出来。这个例子中传入了两个参数x和n，在函数内完成了幂运算，计算出来x的n次幂并储存在了r中，最后返回了r的值。

没有返回值的时候，return也可以单独使用，只起到使函数结束的作用。

另外要注意，函数内部定义的变量在别的地方是不能使用的，这种变量叫做局部变量。同样还有全局变量，是在函数外面定义的，在函数里面也可以使用。

特别的（我讨厌特别的），+可以连接两个字符串，而且，如果把数字和字符串相加会发生什么呢？可以试试（前面的例子中好像用到了）。

比较运算符在逻辑语句中使用，以测定变量或值是否相等，它们的返回值是一个布尔型的数据。

逻辑运算符用于测定变量或值之间的逻辑，它们的返回值是一个布尔型的数据。

variablename=(condition)?value1:value2

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这个格式很，，，总之我不经常使用，因为它的功能完全可以用if else来代替，例如：

greeting=(visitor=="PRES")?"Dear President ":"Dear ";

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不过这东西形式短小精悍，特别适合用在填空的地方，（比如游戏的伤害公式里面，有人这么用过）。

上一节的最后的例子，实际上可以写成if else形式的，如下所示：

if(visitor=="PRES"){
greeting="Dear President ";
}else{
greeting="Dear ";
}

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如果if后面的小括号里面的条件满足的话（实际上是条件结果是true的话）就执行后面的大括号里面的部分，否则就执行后面的else大括号里面的部分。

如果我们不需要考虑否则的结果，那么可以只写if部分，例如：

if(visitor=="PRES"){
greeting="Dear President ";
}

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或者，我们还想再加一种条件，我们就可以在中间在添加else if部分，例如：

if(visitor=="PRES"){
greeting="Dear President ";
}else if(visitor=="CHAI"){
greeting="Dear Chairman ";
}else{
greeting="Dear ";
}

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如果，我们还想再加一种条件，我们还可以在中间添加else if部分，例如：

if(visitor=="PRES"){
greeting="Dear President ";
}else if(visitor=="CHAI"){
greeting="Dear Chairman ";
}else if(visitor=="MANA"){
greeting="Dear Manager ";
}else{
greeting="Dear ";
}

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不断的添加else if虽然也可以解决问题，但是还是显得太繁琐。而且，我们的这些条件都是对同一个变量的值进行判断，那么我们就可以使用switch语句了，上面的例子可以这样写：

switch(visitor)
{
case "PRES":
greeting="Dear President ";
break;
case "CHAI":
greeting="Dear Chairman ";
break;
case "MANA":
greeting="Dear Manager ";
break;
default:
greeting="Dear ";
}

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switch会将变量与每个case后面的值进行比较，如果相同就执行这个case后面的语句，其中的break的作用是阻止自动的执行下一个case，可以去掉，但是建议不要乱去掉。最后的default也像是最后的else，如果前面的case都不成立，就执行这部分的语句，我们可以删去default，这样前面都不成立的时候会直接退出switch，执行后面的语句。

JavaScript里面最常用的一种循环就是for循环，如果我们要依次输出一个数组里面的值，那么我们当然可以依次使用alert语句，如下所示：

var ary=[5,6,7,8,9];
alert(ary[0]);
alert(ary[1]);
alert(ary[2]);
alert(ary[3]);
alert(ary[4]);

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这样就可以完成目标了，但是，如果这个数组里面有100个对象，这样几乎就是不可能完成的（我是不会干这种傻事的，但是录入数据的人，，，可能经常干这种事，请不要对人家说这句话，更不要说是我说的）。

for(var i=0 ; i<5 ; i++){
alert(ary[i]);
}

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我们可以看到，for里面有三个语句，用分号隔开。第一句是在循环开始前执行的。中间一句是在每次循环前判断是否满足条件的，如果满足这个条件，就进行此次循环，否则退出。最后一句是在每次循环结束后进行的语句。

var i=0;
for( ; i<5 ; ){
alert(ary[i]);
i++;
}

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此处注意这么一点，大括号内声明的变量都算是局部变量，外面是不可以直接使用的，而且像上一个例子，for后面的小括号里面声明的var i=0也是局部变量，外面不能用。而这个例子的i是在外面声明的，所以可以用。这种情况叫做变量的作用域，变量只在声明的作用域内有效。

中间的i<5，这个语句其实也可以省略掉的，那么就会变成这样的情况：

var i=0;
for( ; ; ){
if(i<5){
alert(ary[i]);
i++;
continue;
}else{
break;
}
}

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遇到break语句会直接跳出循环，遇到continue语句会直接开始下一次循环。嗯，这样的话，for就成了一个单纯的循环节。尽量不要这么自找麻烦的使用for循环……

这种依次访问一个数组的每个数据的行为，我们叫做遍历，还可以使用这样的语句：

for(var i in ary){
alert(ary[i]);
}

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注意，这东西虽然看着简单，但是实在不太靠谱，尽量不要用。

while 循环会在括号内条件为真时循环执行里面的代码，用法如下：

var i=0;
while (i<5){
alert(ary[i]);
i++;
}

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另外，还可以先循环一次，再判断条件，这就是do while循环，和while循环一样，也是括号内条件成立的话就执行循环里面的代码，用法如下：

var i=0;
do{
alert(ary[i]);
i++;
} while (i<5);

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当 JavaScript 引擎执行 JavaScript 代码时，会发生各种错误：可能是语法错误，通常是程序员造成的编码错误或错别字。也可能是拼写错误或语言中缺少的功能（可能由于浏览器差异）。还可能是由于来自服务器或用户的错误输出而导致的错误。

总之，错误是不可避免的，我们需要考虑一种能够抛出错误的手段，就像电脑坏了会显示蓝屏的错误信息，计算器除以零的时候会报错一样。

function divide(arg1 , arg2){
if(arg2==0){
throw "divided by zero is not allowed";
}else{
return arg1/arg2;
}
}

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我们知道了错误信息，还需要把它显示出来。我们使用try catch语句来处理捕捉到的错误，如下：

var r;
try{
r=divide(50,0);
}catch(err){
alert(err);
}
if(r!=null) alert(r);

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这里使用try catch捕捉到了错误信息，并且放在了err里面，然后由alert输出了错误信息。

另外，try catch的使用，永远应该放在你的控制范围之内，而不应该防范未知的错误。也就是说你很清楚知道这里是有可能出错的，而且你很清楚知道什么前提下会出错，你就是要故意利用报错信息来区分错误，后续的程序会解决所有的出错，让程序继续执行。

简而言之，这个东西是用来区分错误的类型并且处理它的，其他情况下，有些不是很需要用这个语句。

好了，现在我们就要正式开始了，首先先测试一下自己的水平，也可以帮着回忆一下学到的知识。请听题：

咪咪是一只聪明的小老鼠（什么什么？谁规定老鼠就不能叫咪咪了？真是！），她正在四处找水喝呢……她发现了一些水罐，里面都有水。她趴在每个水罐口上都试了一遍，结果仍然一口水没喝到——这些水罐里的水都很少，水面距离罐口太远，她用嘴够不着。这可怎么办呢？

如果是你，你是不是会想把水罐打翻？只可惜，咪咪只是一只小老鼠，没那么大力气呢。不过，这也难不倒她，聪明的咪咪自然有办法：她转过身来，把尾巴放进去浸湿，再喝尾巴上的水就好了，够聪明吧？

我们已知每个水罐里水面到水罐口的距离，还知道咪咪的尾巴最多可以伸进水罐口t 厘米。

根据这些条件，请你判断一下：有多少个水罐中的水可以被咪咪喝到？

要求：写一个函数，参数有两个值，一个是咪咪的尾巴长度t，一个是储存有水罐高度信息的数组，函数的返回值是可以被咪咪喝到的水罐的数量。

function ifDrink(t,pitcher){
//input your code
};
var t=10;
var pitcher=[8,7,13,5,12];
alert(ifDrink(t,pitcher));

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如果感觉脚本的编辑框太小，放不下的话，可以写好后去掉一些换行，或者直接把ifDrink函数放到一个插件里面，然后在事件中的插入脚本输入剩余部分。

另外，一些格式上的问题，或者语法上的问题，（数组的长度该如何获取呢？）这些都可以百度搜索到的。

好了，这个题目自己就可以多用几个算例自己测试一下，下面我给出我的代码，放在图3-1里面，别想ctrl+c，ctrl+v，自己照着一个个的敲一遍，也是很有成就感的。

另外，写在js文件里面然后开启插件的方式也可以，这样你可以试试把后面几句也直接放在js里面有什么不同，如图3-2。

注意，插件里面的代码是会在游戏开始的时候就开始执行的，这点需要特别注意，这个特性如果把握不好就很酸爽了。

如果前面的例子完成了，那就来看我的黑魔法吧。这次我们来做一个随机购买装备的插件。

就像这样，使用1000元钱，然后随机从设置好的装备列表获得一件装备，主要看运气，有可能获得一件小木剑，也有可能获得屠龙刀。

所有装备的列表，是在data文件夹下面以json的形式记录着，在游戏进行的时候，会依照着json文件中的数据创建一个一样的对象，各个对象的对应关系可以从rpg_manager.js中看到，如图3-3。我们可以调用$dataWeapons来获得武器的信息。

通过在各个核心js文件中搜索gain item、 change item等关键词，我们找到了获得物品的函数是放在rpg_objects.js中的Game_Party.prototype.gainItem函数。这样的话，我们也可以调用这个函数来获取装备，如图3-4。

一样的对gold，money等进行搜索，我们找到了控制金钱数量的方法，Game_Party.prototype.gold等等，如图3-5。

这样对思路的初步考虑，我们发现了一些问题，然后找到了解决的办法，这样我们就可以开始编程了，代码如图3-6，3-7，看备注。

看看效果，如图3-8，这样简单的使用刚才的方法调用就好了。第一次使用后，来了一把弓，如图3-9。第二次使用后，又来了一把弓，如图3-10。第三次使用后，来了一把斧子，如图3-11。

试了试，感觉效果还不错，那么我们自己就可以简单的进行使用了。

现在，我们要让别人也能方便的使用这个插件，肯定要做一些说明，但是，单看注释对某些完全不懂js的人还是太费劲，mv特有的插件参数和命令可以让他们也能比较省力的学习使用插件。

我们也要把我们的这个随机买武器插件扩展出参数和命令功能来，该怎么办呢？

还是要对照着人家的代码来分析，再次翻出EnemyBook.js找找看有没有什么参数，命令相关的部分，如图3-12。

好，在打头的注释里面，我们看到了help，这里面的内容和插件管理器的帮助显示的一样，上面还有个param，这和插件管理器的参数也是一样。我们可以猜测，这就是我们需要的部分。
事实上，插件管理器可以解析js的脚本中有特定的格式的部分，把它们当做一些有特定含义的内容表示出来，但是这些东西在js里面确实是不起作用的。

好了，我们也复制一份到我们的RandomWeapon.js里面。再改改，如图3-13。

像这样，我们也有了一个参数，但是，js是不能识别注释里面的内容的，该怎么让它起作用呢？我们继续看EnemyBook.js。好，我们发现了Unknown Data，这个param后面的词，现在在这两句话里面出现了，那么，我们也一样抄下来就好了，如图3-14。

事实上，这里面出现的PluginManager.parameters里面包含了对js插件文件中的参数解析结果，我们可以通过它来得到在插件管理器中输入的参数，另外，这些设置好的数组，都是储存在plugins.js里面的，可以打开看看哦。

我们继续找找在EnemyBook.js里面关于命令的部分，找到了这么两个部分，如图3-15。

先把Game_Interpreter.prototype.pluginCommand放进了一个断头鬼里面，然后又给Game_Interpreter.prototype.pluginCommand赋值一个函数，最后在新的函数里面又调用了断头鬼的call方法。

先解释一下call方法，将a对象的方法加在b对象执行。简单来讲，这个过程就是一个扩展原来的Game_Interpreter.prototype.pluginCommand函数的功能的过程。

断头鬼相当于一个两个变量交换值的时候的临时变量，里面储存了没有被重新赋值过的原来的Game_Interpreter.prototype.pluginCommand函数的内容，然后重新定义Game_Interpreter.prototype.pluginCommand的时候调用临时变量的call方法，就可以让新的函数里面继承了原来久的函数的内容。总之，我们照着写就可以了，完成后，如图3-16。

感谢我们的好友墨汁的提议，我们现在考虑一个能够把变量以进度条的形式显示出来的插件。最终效果如图4-1所示。

先来做一下简单的分析（软件工程还是很有用的）：我们可以画一个新窗口，然后在新窗口里面显示文字，画一个黑色的矩形（当作变量条），然后窗口的每次更新都重新读取对应变量的值，然后重画一次。

窗口，实际上来自于MV的一个对象Window_Base，从官方的文档中我们可以看到关于它的说明，直接查看源码也可以获得相关的知识（在rpg_window.js内）。我们要画一个新窗口，也需要继承Window_Base。

然后，我们就可以创建一个新的窗口了，一般而言，我们这样创建一个窗口。（我也是跟着别人的样式学着写的，大家也可以先跟着写，不明的地方今后慢慢理解）

前面两个如同上次的插件命令一样，我们仍然用的是call，将我们自己的窗口Window_Bar通过addChild方法加入到child里面，然后我们的窗口也可以随着游戏的其他窗口一起绘制出来了，这次是Scene_Map里面的createAllWindows函数。

后面是我们的Window_Bar窗口的定义，是一个function对象。这里面只有一句代码：

this.initialize.apply(this, arguments);

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这个方法是当做构造函数的，即，我们可以把initialize当做构造函数。

之后的代码如图4-4，Window_Bar.prototype是创建了一个Window_Base.prototype，这就相当于Window_Bar继承了Window_Base的prototype，原来Window_Base拥有的属性，现在Window_Bar也有了。

然后指明构造器constructor是上面的Window_Bar，这样我们就可以在此原型链上查找属性了。（此句可以看成Window_Base.prototype的属性也是Window_Bar的属性。关于原型链，就像是通过prototype来实现的属性和方法的继承，可以自行百度更多的信息。）

最后，是Window_Bar的初始化，initialize方法，这个方法在上面就用到了，此处正是他的具体内容。

简单来讲，在创建Window_Bar的时候，会先复制Window_Base里面的属性和方法，然后执行initialize方法，这样的话，我们就需要在initialize里面指明我们需要在初始化的时候额外进行的工作，比如说指定窗口的大小、位置等基本属性。

可以看到，我们仍然使用的call，将Window_Base的initialize方法先执行了一遍，Window_Base的initialize方法有四个参数，分别是x,y,width,height，指明了窗口的位置和大小。

注意，这里的this意思就是这个对象，具体来讲，就是Window_Bar.prototype，所以我们可以使用this来调用Window_Bar.prototype里面的东西。

我们把要设置的这几个属性来封在函数里面（也假装个属性来），如图4-5，这样我们就可以像刚才那样来调用，并且在这几个函数里面读取了插件的参数。（就像上一章的设置方法）。

以上这些都是一些基础的设置，接下来是我们的核心代码，如何在窗口里面画出文字，还有矩形条，如图4-6。

大致就像这样，通过传进来的id参数以及调用系统的变量（就是事件里面用到的那个变量）$gameVariables来获得变量的值，以及我们设置好的变量的上限。计算好比例，设置好宽度和长度。然后开始画矩形和矩形，（一条是背景，一条是已经有的部分），以及在上面写字。

这里要注意，窗口里面的图形都在contents里面储存着，要画图，也要调用contents里面的方法。比如我们所用到的fillRect，gradientFillRect以及drawText。

他们的参数大都相同，都需要由位置和大小。然后还要设置好颜色，用RGB的字符串就可以，drawtext还要有显示的位置（左对齐，右对齐，居中）以及显示的内容，都是字符串。

然后，我们还需要设置好窗口每次刷新时所进行的操作，即重写update方法，如图4-7所示。

update方法，是在Window_Base里面设置好的每次刷新时调用的方法，我们把刚才写的show函数放在这里面调用，这样就可以每次刷新时都重新画一遍，以保证数据的更新。

这里用到了cotents里面的clear方法，用于清空窗口里面以前画上的内容，很显然，我们每次刷新都要重新再画，所以需要清空原来的东西。

然后是对储存了要显示的变量的id的数组的遍历，并且将他们的信息作为函数传到show里面。这样可以对id数组里面的所设置的所有变量进行绘制。

以上部分用到了我已经设置好的插件命令和参数，他们如图4-8所示。

后面的命令有reset，add以及delete，都是通过对id数组以及参数数组args的遍历更改id数组的内容，从而改变显示的变量。

请把top也改成个数组，与id数组一一对应，这样我们就可以对每个变量设置其上限了。

好吧，不要吐槽我混乱的代码风格了，毕竟只是v0.0.1。。。（低版本号是一切bug以及丑陋代码的借口，参考cf的版本号变革）

话说rpg游戏里面很重要的一个系统就是任务系统。但是在RPG Maker MV当中，并没有现成的任务系统来给我们使用。

虽然我们可以将事件，变量和开关联合使用来达到“任务”的效果，但是这终究是不太方便。所以，我们就来做一个任务系统，将上面的功能封装起来，方便我们的使用，毕竟有一个显式的“任务”比一堆不明所以的开关和变量更加符合我们的思维方式，不是吗？

要炫酷的动画提示，还要跟着提示音效，还要与众不同的界面效果。

需求分析，应当把最核心的功能给分析出来，我们制作的时候，也应当这样，先做好基本的功能，然后以此为框架，逐步完善。

好了，有了这个共识，我们会发现，程序只剩下数据和功能，连输入输出的界面都不需要考虑了。这样的话，问题就简单多了。

我们的任务系统是基于原版MV系统的，不是基于其他大神的插件系统的。当然，我们的原则是，尽量不修改原文件，尽量不修改系统对象。

任务系统：当然是像其他游戏一样的。有各种任务，还需要实时监测任务完成的条件，对任务的状态进行管理。

任务：要有编号，名字，描述，当前所处的状态，以及各种条件下触发的动作等等。

var cat=function(){
}

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没错，这就是一个函数，不过js里面的函数可和别的语言的函数不同，它可以用来当做对象/类使用。

当然，在es6的新标准里，我们可以用语法糖class，从而制作像（只是看上去）其他语言里面的类一样的东西。

我们通过new来创建一个对象的副本，并且在同时运行function内的代码，这样的函数就叫做构造器。

定义在function体里面的变量，只能在function里面使用，如果外面要调用的话是不行的。那么我们该如何在外面调用呢？

js提供了原型链这种神奇的东西。简而言之，定义在原型链上的变量都是可以被继承下去的，并且可以在外面调用。通过一个简单的“.”，我们就可以访问原型链上的东西了。就像下面这样，我们可以在原型链上定义新的对象（函数也可以看做对象）。

var Cat=function(){
var m=258;//在构造器内部。
this.mm=123;//不在原型链上，可以访问。
}
Cat.prototype.mmm=456;//在原型链上，一旦修改，全部会变。
var cat1=new Cat();//创建新Cat对象，事实上是创建了对原型链的引用。
var cat2=new Cat();//创建新Cat对象
alert(cat1.m);//不可以访问
alert(cat1.mm)//可以访问
alert(cat1.mmm)//可以访问
cat2.mm=5;
alert(cat1.mm);//仍然是123
cat2.mmm=3;
alert(cat1.mmm);//也变成了3

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我们也可以在外面使用prototype来访问原型链，像下面这样定义一个函数。

Cat.prototype.Say=function(){
return “Miao Miao Miao…”;
}

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但是要注意的是，从同一个Cat上new出来的所有对象，它们的原型链是共享的，也就是说，只要在任意一个对象上改变了原型链的值，那么就会影响所有的对象。如下：

cat1.mm=567;
alert(cat2.mm);//结果也是567

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这种特性方便了继承，但是也造成了一些不便，所以我们一般只在原型链上放共同的特性，以及不会变化的函数。

那么如果我们想要创造每个对象可以取不同的值的属性，该怎么办呢？看下面的代码：

var Dog=function(){
this.name=”The Dog Haven’t Name”;
}
Dog.prototype.getName=function(){
return this.name;
};
Dog.prototype.setName=function(value){
this.name=value;
};

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像这样，定义在原型链上的函数里面的内容，是可以访问构造器里面定义的变量的（像上面的name），这样我们就可以为不同的Dog设置不同的name了，使用的时候只需要通过两个函数getName和setName，而这两个函数对所有的Dog来讲只有一份。

这只是一种简单的封装方法，也是js原生支持的一种方法，关于如何用js实现面向对象的各种特性，可以专门百度，有很多更好的办法。不过在这里，我们的方法就够了。

简单明白了原型链之后，我们就可以正式开始了，首先，要定义一个Task对象，这应该是所有的任务对象的原型（与类相似的）。任务要有各种各样的属性和方法。

我们像下面的图5-1这样定义一个Task，注意，仍然按我的风格，放进命名空间里面装逼~~~

需要说明的是，id，title之类的属性都是各不相同的，所以应当放在构造器中定义，而且后面的几个函数也一样，分别对应着各种情况下要自动响应的动作。在我们的设计中每个Task通过定义各自的这些动作来完成自动的处理。

那么后面当然还要在原型链上定义对上面的属性和方法的操作了，否则在外边是访问不到的。具体的内容可以看附件中的实际插件的脚本。

然后，我们就该定义一个管理者了——Manager。为什么非要管理者呢？难道你不觉得这样的分层设计更加的明（ke）白（yi）可（zhuang）靠（bi）吗？

这个Manager就简单多了，只需要一个任务列表（数组），用来储存我们生成的具体的Task对象。还有一些方法，用来把对任务列表的操作封装起来。调用的时候更加简单明白。定义如图5-2。
好吧，我的起名水平和封装水平一样，但是这不要紧。毕竟大致已经够我使用了。

好吧，我们难道非得把数据写在事件里？每次都要new一个？还有，任务是事件，但是任务信息可以算是数据了，写在动态生成的地方真的好吗？

基于以上及其他原因考虑，我们将要把所有已经设计好的任务，放在一个json表里面，这样就可以方便我们设计和管理已经制作好的任务了。

但是，个人风格，为了写注释，我不用json文件，而是改写成js，把它和插件一起加载。这样除了使用的时候麻烦一些，倒也不错。

此外，我们还要在Manager里面专门定义一个函数，用来读取json（暂时仍然这么叫吧）的信息，并且转换成我们真正的Task并存在Manager的任务列表里面。这就是loadTaskFile函数的功能了。

Tasks，这个json一样的列表，关于他的具体内容可以参看附件中的文件。毕竟东西有点多，而且里面也是加了比较详细的注释的。

但是，这个loadTaskFile函数，我们还是可以在这里分析一下的，如图5-3。

先将任务列表清空，然后来一个循环遍历Tasks这个（伪？）json。每次都创建一个新的Task，然后根据Tasks里面的值来设定这个新的Task对应的值（这一部分功能被放到了createByData函数里面）。最后把新的Task放进任务列表里面。然后执行一些操作：将state设置为Unrecive，将avaliable设置为true，执行自己定义的init函数。事实上就相当于进行了初始化。

同样的，自己定义的begin会在开始任务的时候执行，ifFinish会在判定任务是否完成时当做判据（返回值），end会在任务结束时执行。当然这些都要自己进行设计。

好了，一切设计的都很完美，但是关键的一点仍然没有进行——如何对变量进行管理？让任务达到条件自动改变状态，自动执行动作。这些都需要一个监视者，每时每刻都在执行这一任务——判定任务所处的状态。这实际上是要并行完成的，但是，我们考虑到窗口的事件模型的话。我们可以用一种比较“简单”的方法来完成这件事情——画一个窗口，然后在窗口的update里面添加上相关的判定部分，顺便还能显示一些我们所需要的信息。（这些都不重要，真的，没有任务窗口，不显示任务信息难道就是没有任务了？）

显然是的，因为这些代码都是每次开启游戏都会执行一遍的。也就是说，目前为止你并不能保存下来任何东西。

在保存前，我们遍历了manager的任务列表，并且把每个任务的variables带着名字存到了一个新的空对象里面。

然后，我们使用JSON.stringify函数，将一个js对象变成了一个字符串。这样，就可以把它放进某个MV的变量（在事件窗口用到的那种）中去了。

下次读取的时候，只要把这个字符串上的值用JSON.parse函数还原回来就好了，这简直是太机智了。

这种方法需要付出一个MV变量槽，以及重写存档读档的函数。用不用自己决定吧。

好多朋友说从js基础到MV插件的跳跃太快，那咱们就来几道练习题压压惊。

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复制代码

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复制代码

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复制代码

扫雷游戏是一种比较简单而有趣的游戏，实现起来也简单。
据说有纯事件的实现，然而我们这次再装一个小逼，要实现通过脚本动态的对事件进行操作。
首先是我们的思路：
由js脚本完成逻辑层，即整个扫雷的实现完全由js脚本实现，而地图上的事件仅仅用来做显示和交互（点击）用。
并且，对于地图上的事件变化的控制，也应当由脚本来决定，包括动态生成事件（即根据设定来动态决定格子的数量和雷的数量）。
先准备一张图再说，我们要用行走图的不同方向来表示不同的数字？或者小旗子，然后通过控制事件的方向来改变显示的数字，如图6-1所示。

研究Game_Event可知，其显示的图片由_direction和_originalPattern两个属性决定，关系如下表：

→_originalPattern ↓_direction	0	1	2
2	空地	旗子	地雷
4	0（空地）	1	2
6	3	4	5
8	6	7	8

首先还是老套路，来个命名空间MineSweeping，接下来我们再多添加一个debug用的标志Debug，方便我们区分调试和正式的内容。

接下来是区域的宽度和高度，以及地雷的数量。还有记录地雷分布的数组MineMap（这个数值将在后面被变成二维数组，后面几个也一样），记录玩家清扫过的地雷的记录（即显示在屏幕上的数据的记录）的数组FoundMap，还有将动态生成的事件引用过来保存起来的数组EventMap。
记录游戏状态，方便交互的State，还有左上角第一个事件，也是copy的原型事件的位置。
这些都可以在游戏中用事件里面的脚本控制。如图6-2。

游戏状态的改变我们用Start，Lost，Win三个方法封装起来。如图6-3。

游戏开始后，首先初始化地雷分布，由Math.Random()函数来确定出随机生成的地雷的位置。
接下来，需要写好点击一下（或者叫扫雷一下，对着空白的格子点一下）的方法，即Click（原谅我起名字捉急）。如果点中了雷，那么直接游戏失败，否则，统计一下周围一圈的雷的数量，然后把这个数字记录到FoundMap里面。
这里需要注意的是，如果周围都没有雷，那么我们需要把四周都自动点击（Click）一遍，这是一个递归用法。
然后，是标记（画小旗子，记录一下这里有雷）的方法，即Sign。这个方法比较简单，只需要对于白方块改变状态为被标记状态就好，当然还需要把小旗子标志取消后恢复为白方块。
之后，是扫过一圈，通常用在这个数字旁边插够了小旗子，然后程序帮助你把这个数字周围都点击一遍，即Sweep。以上这几个方法如同6-4。

最后是将扫雷的逻辑操作跟MV的事件绑定在一起，让游戏的图形界面发挥功能。如图6-5，我们用Binding，Recheck和Refresh来完成。
Binding方法将根据设定好的地图大小（扫雷区域的宽和高）复制那个样板事件，并且移动到对应的位置，这里复制事件用的函数来自汪神的思路（我只是大自然的搬运工，以及感谢汪神）。另外还要将生成的事件引用存到我们的EventMap数组里面，方便我们的使用。
之后就是对事件的显示的图像进行操作了，这就是Recheck方法的功能，检测i，j位置处的FoundMap的值，即游戏中地块的状态。然后将对应的EventMap中的事件的_direction和_originalPattern两个属性做出相应的改变。
最终就是Refresh方法，要使得事件的图像跟FoundMap的值一一对应起来，关键在于不断的进行同步，即不断的执行Recheck方法，这就是Refresh方法的功能，显然这需要异步方法进行实现，这里为了方便，就将这个方法放到了MV的并行事件中去执行了。如图6-6。

这就是整个游戏程序的思路，当然具体实现还要看具体的代码。

插件的代码部分设计好后，我们就要在MV的事件里面调用它了。
由于模仿单击，右击还有左右键同时按比较困难，我们就用一个MV变量来决定到底用什么击。

像这样，旁边放三个事件，分别使得MV变量0001的值变为0，1，2，分别用作单击，标记，还有扫一大片。如图6-7

然后是设置好地块事件，在运行时会复制此地块，如图6-8。在此事件中，由确定键触发，即点击鼠标触发，触发后，先获取玩家的位置x，y，然后将其依据操作类型进行处理，并将玩家的位置MV地图的x，y值转化为扫雷数组的x，y，再调用对应的操作的方法。

然后是游戏的初始化，即设置好地图的起始点，地图的宽高，雷的数量，复制地块等操作，如图6-9。