Lua Self-study Log

刚开始自学Lua；

感觉脚本语言都是一类，语法不严密，所以规则少了，学起来，就更加容易了；

首先，我是使用Windows系统，那么就得下个，Windows下Lua专用的Editor了；

LuaForWindow_5.1

简称：Lfw

安装完后；

运行：Intruduction程序；（安装完后，有提示运行的）；

当然如果没有留意到上面操作的，也可以自己手动运行，

Lua安装目录/5.1/examples/quickluatour.lua；也一样可以让Intruduction程序再次运行；

好了，看完quickluatour.lua后，如果都了解了，那么恭喜你，你已入门喇；哈哈；

当然，你也可以，打开，Lfw的帮助手册（.chm）来瞅瞅;在安装目录下可以找到；

如果还没找到或是实在不想找，你也可以运行Lfw后，再按下：F1后，会自动打开"Lua 5.1.4.chm"的；

当然，除非说，这个文件真不存在，那就悲催了；

瞅瞅我第一个简单的DEMO：

io.write("hello world! my name is jave.lin\n");
io.write("ready to test the table statement\n");
myTable = {1,2,3,"the 4 idx value"};
myTable.old=26;
myTable.firstname="jave";
myTable.lastname="lin";
myTable.favorate="game";
for k,v in pairs(myTable) do io.write("the key : "..k," the value : "..v,"\n") end
for k,v in pairs(myTable) do
 io.write(string.format(
				"myTable[%s]=%s,k is [%s], v is [%s]\n",
				tostring(k),
				tostring(v),
				tostring(type(k)),
				tostring(type(v))
				)
		)
end

瞅瞅Lfw运行效果：

详细的更多DEMO：

--test hello wrod!
io.write("hello world! my name is jave.lin\n");
io.write("ready to test the table statement\n");
--test table object
myTable = {1,2,3,"the 4 idx value"};
myTable.old=26;
myTable.firstname="jave";
myTable.lastname="lin";
myTable.favorate="game";
--test table conver to paris by for statement
for k,v in pairs(myTable) do io.write("the key : "..k," the value : "..v,"\n") end
for k,v in pairs(myTable) do
	io.write(string.format(
				"myTable[%s]=%s,k is [%s], v is [%s]\n",
				tostring(k),
				tostring(v),
				tostring(type(k)),
				tostring(type(v))
				)
		)
end

--test callback
function myFunc ()
	print("My Name is : Lin Jian Feng, E-Name : Jave.Lin")
	return 1
end

myFunc()

local callback=myFunc;
callback()

function mySpeakHandler() print("i like the LOL Game!") end

myTable.speak=mySpeakHandler;--set the callback
myTable.speak()--call it

--return mutil results
function getMutilSpeak()
	local callback1,callback2,callback3
	function tempFunc1(s)--attention : nested func
		print(s.." i'am jave.lin, and i like 3c")-- ".." can combin the string
	end
	function tempFunc2(s)
		print(s.." i'am jave.lin, and i like dota")
	end
	function tempFunc3(s)
		print(s.." i'am jave.lin, and i like music")
	end
	callback1=tempFunc1
	callback2=tempFunc2
	callback3=tempFunc3
	return callback1,callback2,callback3
end

local c1,c2,c3=getMutilSpeak()
c1("direct call")
c2("direct call")
c3("direct call")

--create func array/table, and calls
--method1
funcTable={c1,c2,c3}
for i=1,3 do funcTable[i]("from method1") end

--method2
--attention table conver to pairs kword: pairs(tableObj)
for k,v in pairs(funcTable) do v("from method2") end

--method3
--use foreach statement
function action(idx,tempFunc)
	tempFunc("from method3, the "..idx.." : ")
end
table.foreach(funcTable,action)

--method4
--use anonymous func
table.foreach(funcTable,function(idx,tempFunc) tempFunc("from method4, the "..idx.." : anonymous func : ") end)

--test concat
strTable={"iOS","Android","Windows","Others"}
print("i like os : "..table.concat(strTable,"-"))--print result : i like os : iOS-Android-Windows-Others

strTable={"H","A","P","P","Y"}
print("are you "..table.concat(strTable))--are you HAPPY

--test sort
strTable={"c","b","a"}
print("src strTable values : "..table.concat(strTable," "))--src strTable values : c b a
table.sort(strTable)
print("and now sorted values : "..table.concat(strTable," "))--and now sorted values : a b c

--test insert
table.insert(strTable,3,"d")
print("inserted values : "..table.concat(strTable," "))--inserted values : a b d c
table.sort(strTable,function(v1,v2) return v1>v2 end)
print("and now desc sorted values : "..table.concat(strTable," "))--and now desc sorted values : d c b a

--test remove
table.remove(strTable,1)--remove first element
print("removed values : "..table.concat(strTable," "))--removed values : c b a

--test maxn
--result max key's(not value), and key must be a number
print("strTable.maxn : "..table.maxn(strTable))
t={["abceeee"]=0,["abcd"]=1,["abcde"]=3}--no key is number element, so maxn == 0
print("t.maxn : "..table.maxn(t))
t={11,22,33,["abceeee"]=0,["abcd"]=1,["abcde"]=3}--no key ,default number, 11,22,33,keys is : 1,2,3，three number,but ["abceeee"],["abcd"],["abcde"] is Nan, so maxn == 3
print("t.maxn : "..table.maxn(t))

--test getn
print("t element count : "..table.getn(t)..table.concat(t,", "))--t element count : 3
table.remove(t,1);
print("t element count : "..table.getn(t)..table.concat(t,", "))--t element count : 2

--test setn
--table.setn(t,10);--it's obsolete(作废的) in 5.1 version


--以上的方法中，很多方法都是使用了table下的方法，可以参考：http://blog.163.com/yunfei_lei@126/blog/static/14086456120128848799/
--的介绍

运行结果：

>lua -e "io.stdout:setvbuf 'no'" "myFirstLua.lua" 
hello world! my name is jave.lin
ready to test the table statement
the key : 1 the value : 1
the key : 2 the value : 2
the key : 3 the value : 3
the key : 4 the value : the 4 idx value
the key : firstname the value : jave
the key : favorate the value : game
the key : lastname the value : lin
the key : old the value : 26
myTable[1]=1,k is [number], v is [number]
myTable[2]=2,k is [number], v is [number]
myTable[3]=3,k is [number], v is [number]
myTable[4]=the 4 idx value,k is [number], v is [string]
myTable[firstname]=jave,k is [string], v is [string]
myTable[favorate]=game,k is [string], v is [string]
myTable[lastname]=lin,k is [string], v is [string]
myTable[old]=26,k is [string], v is [number]
My Name is : Lin Jian Feng, E-Name : Jave.Lin
My Name is : Lin Jian Feng, E-Name : Jave.Lin
i like the LOL Game!
direct call i'am jave.lin, and i like 3c
direct call i'am jave.lin, and i like dota
direct call i'am jave.lin, and i like music
from method1 i'am jave.lin, and i like 3c
from method1 i'am jave.lin, and i like dota
from method1 i'am jave.lin, and i like music
from method2 i'am jave.lin, and i like 3c
from method2 i'am jave.lin, and i like dota
from method2 i'am jave.lin, and i like music
from method3, the 1 :  i'am jave.lin, and i like 3c
from method3, the 2 :  i'am jave.lin, and i like dota
from method3, the 3 :  i'am jave.lin, and i like music
from method4, the 1 : anonymous func :  i'am jave.lin, and i like 3c
from method4, the 2 : anonymous func :  i'am jave.lin, and i like dota
from method4, the 3 : anonymous func :  i'am jave.lin, and i like music
i like os : iOS-Android-Windows-Others
are you HAPPY
src strTable values : c b a
and now sorted values : a b c
inserted values : a b d c
and now desc sorted values : d c b a
removed values : c b a
strTable.maxn : 3
t.maxn : 0
t.maxn : 3
t element count : 311, 22, 33
t element count : 222, 33
>Exit code: 0