中文字符的整数形式大于127

-- 计算字符串宽度

local

str
=

"Jimmy: 你好,世界!"

local

fontSize
= 20

local

lenInByte
= #str

local

width
= 0

for

i=1,lenInByte

do

local

curByte
=

string.byte

(str,
i)

local

byteCount
= 1;

if

curByte>0

and

curByte<=127

then

byteCount
= 1

elseif

curByte>=192

and

curByte<223

then

byteCount
= 2

elseif

curByte>=224

and

curByte<239

then

byteCount
= 3

elseif

curByte>=240

and

curByte<=247

then

byteCount
= 4

end

local

char
=

string.sub

(str,
i, i+byteCount-1)

i
= i + byteCount -1

if

byteCount
== 1

then

width
= width + fontSize * 0.5

else

width
= width + fontSize

print

(char)

end

end

print

(

"总宽度:
"

..width)