-- 将字符串按照指定分隔符分割成数组
function string.split(input, delimiter)
    input = tostring(input)
    delimiter = tostring(delimiter)
    if (delimiter=='') then return false end
    local pos,arr = 0, {}
    -- 对于每个找到的分隔符
    for st,sp in function() return string.find(input, delimiter, pos, true) end do
        table.insert(arr, string.sub(input, pos, st - 1))
        pos = sp + 1
    end
    table.insert(arr, string.sub(input, pos))
    return arr
end

-- 去除字符串两端的空白字符
function string.trim(input)
    input = string.gsub(input, "^[ \t\n\r]+", "")
    return string.gsub(input, "[ \t\n\r]+$", "")
end