pairs 和 ipairs异同

local tabFiles = {
        [1] = "test2",
        [6] = "test3",
        [4] = "test1"
    }

for k, v in ipairs(tabFiles) do    --输出"test2",在key等于2处断开
    print(k, v)
end

local tabFiles = {
    [2] = "test2",
    [6] = "test3",
    [4] = "test1"
}

for k, v in ipairs(tabFiles) do  --[[什么都没输出，为什么？因为控制变量初始值是按升序来遍历的，当key为1时，value为nil，此时便停止了遍历， 所有什么结果都没输出]]--
    print(k, v)
end

local tabFiles = {
    [2] = "test2",
    [6] = "test3",
    [4] = "test1"
}

for k, v in pairs(tabFiles) do  --输出2 test2, 6 test3, 4 test1
    print(k, v)
end

local tabFiles = {"alpha", "beta", [3] = "no", ["two"] = "yes"}  for i,v in ipairs(tabFiles ) do    --输出前三个   备注：因为第四个key不是整数
    print( tabFiles [i] )   
end   
  
for i,v in pairs(tabFiles ) do    --全部输出   
    print( tabFiles [i] )   
end 

function split(str,delimiter)
    local dLen = string.len(delimiter)
    local newDeli = ‘‘
    for i=1,dLen,1 do
        newDeli = newDeli .. "["..string.sub(delimiter,i,i).."]"
    end

    local locaStart,locaEnd = string.find(str,newDeli)
    local arr = {}
    local n = 1
    while locaStart ~= nil
    do
        if locaStart>0 then
            arr[n] = string.sub(str,1,locaStart-1)
            n = n + 1
        end

        str = string.sub(str,locaEnd+1,string.len(str))
        locaStart,locaEnd = string.find(str,newDeli)
    end
    if str ~= nil then
        arr[n] = str
    end
    return arr
end    
t = split("php,js", ",")
for k, v in pairs(t) do
    print(k, v)
end

php
js