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<time datetime="2020-02-26T22:02:00.000Z" title="2/27/2020, 6:02:00 AM">2020-02-27</time></span><span class="level-item">Updated <time datetime="2024-02-17T03:35:16.587Z" title="2/17/2024, 11:35:16 AM">2024-02-17</time></span><span class="level-item"> Jack Liu </span><span class="level-item"><a class="link-muted" href="/categories/Go/">Go</a></span><span class="level-item">7 minutes read (About 1040 words)</span></div></div><h1 class="title is-3 is-size-4-mobile">Go:fmt.Printf() 格式化占位符</h1><div class="content"><h3 id="fmt-Printf-格式化占位符"><a href="#fmt-Printf-格式化占位符" class="headerlink" title="fmt.Printf() 格式化占位符"></a>fmt.Printf() 格式化占位符</h3><h4 id="格式符-fmt-Printf-quot-v-quot-variable"><a href="#格式符-fmt-Printf-quot-v-quot-variable" class="headerlink" title="格式符 fmt.Printf("%v", variable)"></a>格式符 <code>fmt.Printf("%v", variable)</code></h4><span id="more"></span><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br></pre></td><td class="code"><pre><span class="line"># 【通用占位符】</span><br><span class="line"> v 值的默认格式。</span><br><span class="line"> %+v 添加字段名(如结构体)</span><br><span class="line"> %#v 相应值的Go语法表示</span><br><span class="line"> %T 相应值的类型的Go语法表示</span><br><span class="line"> %% 字面上的百分号，并非值的占位符 </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"># 【布尔值】</span><br><span class="line"> %t true 或 false</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"># 【整数值】</span><br><span class="line"> %b 二进制表示</span><br><span class="line"> %c 相应Unicode码点所表示的字符</span><br><span class="line"> %d 十进制表示</span><br><span class="line"> %o 八进制表示</span><br><span class="line"> %q 单引号围绕的字符字面值，由Go语法安全地转义</span><br><span class="line"> %x 十六进制表示，字母形式为小写 a-f</span><br><span class="line"> %X 十六进制表示，字母形式为大写 A-F</span><br><span class="line"> %U Unicode格式：U+1234，等同于 "U+%04X"</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"># 【浮点数及复数】</span><br><span class="line"> %b 无小数部分的，指数为二的幂的科学计数法， </span><br><span class="line"> 与 strconv.FormatFloat中的 'b' 转换格式一致。例如 -123456p-78</span><br><span class="line"> %e 科学计数法，例如 -1234.456e+78</span><br><span class="line"> %E 科学计数法，例如 -1234.456E+78</span><br><span class="line"> %f 有小数点而无指数，例如 123.456</span><br><span class="line"> %g 根据情况选择 %e 或 %f 以产生更紧凑的（无末尾的0）输出</span><br><span class="line"> %G 根据情况选择 %E 或 %f 以产生更紧凑的（无末尾的0）输出</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"># 【字符串和bytes的slice表示】</span><br><span class="line"> %s 字符串或切片的无解译字节</span><br><span class="line"> %q 双引号围绕的字符串，由Go语法安全地转义</span><br><span class="line"> %x 十六进制，小写字母，每字节两个字符</span><br><span class="line"> %X 十六进制，大写字母，每字节两个字符</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"># 【指针】</span><br><span class="line"> %p 十六进制表示，前缀 0x</span><br><span class="line"> 这里没有 'u' 标记。若整数为无符号类型，他们就会被打印成无符号的。</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"># 【精度和对齐方式】</span><br><span class="line"> 〔输出最少宽度〕〔．精度〕〔长度〕类型</span><br><span class="line"> "%-md" ：左对齐，若m比实际少时，按实际输出。</span><br><span class="line"> "%m.ns"：输出m位，取字符串(左起)n位，左补空格，当n>m or m省略时m=n</span><br><span class="line"> "%m.nf"：输出浮点数的输出宽度对齐，m为宽度，n为小数点右边数位</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"># 【宽度和精度】</span><br><span class="line"> 指示符(`f')为例：</span><br><span class="line"> %f: 默认宽度和精度 </span><br><span class="line"> %mf 宽度m, 默认精度 </span><br><span class="line"> %.nf 默认宽度, 精度n </span><br><span class="line"> %m.nf 宽度m, 精度n </span><br><span class="line"> %m.f 宽度m, 精度0</span><br><span class="line"> 若遇到浮点数的指示符(`f')的话，它表示小数部分的位数。</span><br><span class="line"> 若遇到浮点数的指示符(`e', `E', `g', `G')的话，它表示有效位数</span><br><span class="line"> 若将精度设为`*'的话，将从参数中提取精度的值</span><br><span class="line"> 整数的指示符(`d', `i', `b', `o', `x', `X', `u')</span><br><span class="line"> 其中对于字符串％s或者浮点类型％f,来说，精度可以截断数据的长度</span><br><span class="line"> "%-md" ：左对齐，若m比实际少时，按实际输出。</span><br><span class="line"> "%m.ns"：输出m位，取字符串(左起)n位，左补空格，当n>m or m省略时m=n</span><br><span class="line"></span><br><span class="line"># 【显示参数占位符】</span><br><span class="line"> %[2]d, %[1]d 以%d为例：先输出第二个值，再输出第一个值.</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"># 【特殊格式标识符】</span><br><span class="line"> + 总打印数值的正负号；对于%q（%+q）保证只输出ASCII编码的字符。 </span><br><span class="line"> - 左对齐 </span><br><span class="line"> # 备用格式：</span><br><span class="line"> 为八进制添加前导 0（%#o），</span><br><span class="line"> 为十六进制添加前导 0x（%#x）或0X（%#X），为 %p（%#p）去掉前导 0x；</span><br><span class="line"> 对于 %q，若 strconv.CanBackquote 返回 true，</span><br><span class="line"> 就会打印原始（即反引号围绕的）字符串；</span><br><span class="line"> 如果是可打印字符，%U（%#U）会写出该字符的</span><br><span class="line"> Unicode编码形式（如字符 x 会被打印成 U+0078 'x'）。 </span><br><span class="line"> ' ' （空格）为数值中省略的正负号留出空白（% d）；</span><br><span class="line"> 以十六进制（% x, % X）打印字符串或切片时，在字节之间用空格隔开 </span><br><span class="line"> 0 填充前导的0而非空格；对于数字，这会将填充移到正负号之后</span><br><span class="line"></span><br></pre></td></tr></table></figure></div><div class="article-licensing box"><div class="licensing-title"><p>Go:fmt.Printf() 格式化占位符</p><p><a 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