# 字符串,數組,表 - 支持單引號,多引號,\[\["字符串"\]\]三種;\\n換行,\\t制表,\\本身,' "單雙引號 ``` <pre class="calibre14">``` arg <span class="token">=</span> string<span class="token2">.</span><span class="token1">upper</span><span class="token2">(</span>arg<span class="token2">)</span> 轉換大小 lower小寫 reverse反轉字符 string<span class="token2">.</span><span class="token1">gsub</span><span class="token2">(</span><span class="token4">"aaaa"</span><span class="token2">,</span><span class="token4">"a"</span><span class="token2">,</span><span class="token4">"z"</span><span class="token2">,</span><span class="token3">3</span><span class="token2">)</span><span class="token2">;</span> 查找a替換成c<span class="token2">,</span>次數<span class="token3">3</span><span class="token2">,</span>忽略次數是全部 string<span class="token2">.</span><span class="token1">find</span><span class="token2">(</span><span class="token4">"Hello Lua user"</span><span class="token2">,</span> <span class="token4">"Lua"</span><span class="token2">)</span><span class="token2">;</span> 查找lua返回位置<span class="token3">7</span><span class="token2">,</span>從<span class="token3">1</span>開始<span class="token2">,</span>不才尊返回nil<span class="token2">,</span>php中空白 string<span class="token2">.</span><span class="token1">format</span><span class="token2">(</span><span class="token4">"the value is:%d"</span><span class="token2">,</span><span class="token3">4</span><span class="token2">)</span> 格式化字符 string<span class="token2">.</span><span class="token1">char</span><span class="token2">(</span><span class="token3">97</span><span class="token2">,</span><span class="token3">98</span><span class="token2">,</span><span class="token3">99</span><span class="token2">,</span><span class="token3">100</span><span class="token2">)</span> 返回abcd string<span class="token2">.</span><span class="token1">byte</span><span class="token2">(</span><span class="token4">"ABCD"</span><span class="token2">,</span><span class="token3">4</span><span class="token2">)</span> <span class="token3">68</span>第四個 不填是第一個 string<span class="token2">.</span><span class="token1">len</span><span class="token2">(</span><span class="token4">"abc"</span><span class="token2">)</span> <span class="token3">3</span> 中文一個是<span class="token3">3</span> string<span class="token2">.</span><span class="token1">rep</span><span class="token2">(</span><span class="token4">"abcd"</span><span class="token2">,</span><span class="token3">2</span><span class="token2">)</span> 返回拷貝數 ``` ``` - 數組下標從1開始 ``` <pre class="calibre14">``` array <span class="token">=</span> <span class="token2">{</span><span class="token4">"Lua"</span><span class="token2">,</span> <span class="token4">"Tutorial"</span><span class="token2">}</span> 一維數組 ``` ``` - 表,刪除表mytable = nil ``` <pre class="calibre14">``` tables<span class="token">=</span><span class="token2">{</span><span class="token2">}</span> tables<span class="token2">[</span><span class="token3">1</span><span class="token2">]</span><span class="token">=</span><span class="token4">"aaaa"</span> table<span class="token2">.</span><span class="token1">concat</span><span class="token2">(</span>fruits<span class="token2">,</span><span class="token4">", "</span><span class="token2">,</span> <span class="token3">2</span><span class="token2">,</span><span class="token3">3</span><span class="token2">)</span> 鏈接字符 table<span class="token2">.</span><span class="token1">insert</span><span class="token2">(</span>fruits<span class="token2">,</span><span class="token4">"mango"</span><span class="token2">)</span> 插入元素<span class="token2">,</span>默認在尾部<span class="token2">,</span>可以指定索引table<span class="token2">.</span><span class="token1">insert</span><span class="token2">(</span>fruits<span class="token2">,</span><span class="token3">2</span><span class="token2">,</span><span class="token4">"mango"</span><span class="token2">)</span> table<span class="token2">.</span><span class="token1">remove</span><span class="token2">(</span>fruits<span class="token2">)</span> 刪除最后一個 table<span class="token2">.</span><span class="token1">sort</span><span class="token2">(</span>fruits<span class="token2">)</span> 排序 ``` ``` - 模塊,表去實現,require "mod" ``` <pre class="calibre14">``` module <span class="token">=</span> <span class="token2">{</span><span class="token2">}</span> module<span class="token2">.</span>a<span class="token">=</span><span class="token4">"常量"</span> <span class="token5">function</span> module<span class="token2">.</span><span class="token1">func1</span><span class="token2">(</span><span class="token2">)</span> io<span class="token2">.</span><span class="token1">write</span><span class="token2">(</span><span class="token4">"這是一個公有函數！\n"</span><span class="token2">)</span> end local <span class="token5">function</span> <span class="token1">func2</span><span class="token2">(</span><span class="token2">)</span> <span class="token1">print</span><span class="token2">(</span><span class="token4">"這是一個私有函數！"</span><span class="token2">)</span> end <span class="token5">function</span> module<span class="token2">.</span><span class="token1">func3</span><span class="token2">(</span><span class="token2">)</span> <span class="token1">func2</span><span class="token2">(</span><span class="token2">)</span> end <span class="token5">return</span> module ``` ``` - 讀取輸出文件 ``` <pre class="calibre16">``` file<span class="token">=</span>io<span class="token2">.</span><span class="token1">open</span><span class="token2">(</span><span class="token4">"1.txt"</span><span class="token2">,</span><span class="token4">"a+"</span><span class="token2">)</span> w<span class="token">+</span>會清<span class="token3">0</span> a<span class="token">+</span>是追加 不存在會自動創建文件 io<span class="token2">.</span><span class="token1">input</span><span class="token2">(</span>file<span class="token2">)</span> arg<span class="token">=</span>io<span class="token2">.</span><span class="token1">read</span><span class="token2">(</span><span class="token4">"*a"</span><span class="token2">)</span> io<span class="token2">.</span><span class="token1">output</span><span class="token2">(</span>file<span class="token2">)</span> io<span class="token2">.</span><span class="token1">write</span><span class="token2">(</span><span class="token4">"-- test.lua 文件末尾注釋"</span><span class="token2">)</span> io<span class="token2">.</span><span class="token1">close</span><span class="token2">(</span>file<span class="token2">)</span> ``` ```