Lua - The Language 1 控制结构、table数据结构
1。用[[xxxxx]]直接引用字符串，类似于C#里的 @"xxxxx"。
比如： [[alo [[
"alo\n123\"" = 123"]] = alo
123"]]
2。循环结构和选择结构
-- for and if
for i = 1,5 do
print("i is now "..i)
if i < 2 then
print("small")
elseif i < 4 then
print("medium")
else
print("big")
end
end
-- while
i=1
while i <=5 do
print("i is now "..i)
if i < 2 then
print("small")
elseif i < 4 then
print("medium")
else
print("big")
end
i = i+1
end
-- repeat until，注意没有end
i=1
repeat
print("i is now "..i)
if i < 2 then
print("small")
elseif i < 4 then
print("medium")
else
print("big")
end
i = i+1
until i == 6
输出结果：
i is now 1
small
i is now 2
medium
i is now 3
medium
i is now 4
big
i is now 5
big
3。简单的table结构
-- Arrays
myData = {}
myData[0] = "foo"
myData[1] = 42
-- Hash tables
myData["bar"] = "baz"
-- Iterate through the structure
for key,value in myData do
print(key .. "=" .. value)
end
输出结果：
1=42
0=foo
bar=baz
4。嵌套的table结构
-- table结构
myPolygon = {
color="blue",
thickness=2,
npoints=4;
{x=0,y=0},
{x=-10,y=0},
{x=-5,y=4},
}
-- 索引形式
print(myPolygon["color"])
-- 点形式
print(myPolygon.thickness)
-- 三个子表，分别是myPolygon[1] 到 myPolygon[3]
print(myPolygon[2].x)
print(myPolygon[3]["y"])
输出结果：
blue
2
-10
4