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实现trim的3种方法.html
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<p>trim 方法 (字串) (JavaScript) 移除字串前后的空白字元以及行结束字元。</p>
<ul>
<li>用法
string.trim()</li>
</ul>
<ol>
<li><p>递归截取(不推荐)</p>
<figure class="highlight javascript"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">trim</span>(<span class="params">str</span>)</span>{</span><br><span class="line"><span class="comment">// 加入类型判断 </span></span><br><span class="line"><span class="keyword">if</span>(str[<span class="number">0</span>]===<span class="string">' '</span>||str[str.length<span class="number">-1</span>]===<span class="string">' '</span>){</span><br><span class="line"> <span class="keyword">if</span>(str[<span class="number">0</span>]===<span class="string">' '</span>){</span><br><span class="line"> str=str.substring(<span class="number">1</span>,str.length)</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(str[str.length<span class="number">-1</span>]===<span class="string">' '</span>){</span><br><span class="line"> str=str.substring(<span class="number">0</span>,str.length<span class="number">-1</span>)</span><br><span class="line"> }</span><br><span class="line"> trim(str)</span><br><span class="line"> }<span class="keyword">else</span>{</span><br><span class="line"> <span class="built_in">console</span>.log(str)</span><br><span class="line"> <span class="keyword">return</span> str</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
<li><p>2次遍历记录不为空格的索引，最后截取</p>
<figure class="highlight javascript"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">trim</span>(<span class="params">str</span>) </span>{</span><br><span class="line"> <span class="keyword">let</span> start, end <span class="comment">// 开始和结束为止 遍历记录不为空格的索引</span></span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i < str.length; i++) {</span><br><span class="line"> <span class="keyword">if</span> (str[i] !== <span class="string">' '</span>) {</span><br><span class="line"> start = i</span><br><span class="line"> <span class="keyword">break</span></span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">let</span> i = str.length - <span class="number">1</span>; i > <span class="number">0</span>; i--) {</span><br><span class="line"> <span class="keyword">if</span> (str[i] !== <span class="string">' '</span>) {</span><br><span class="line"> end = i</span><br><span class="line"> <span class="keyword">break</span></span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> str.substring(start, end + <span class="number">1</span>)</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
<li><p>正则替换</p>
<figure class="highlight javascript"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">trim</span>(<span class="params">str</span>) </span>{</span><br><span class="line"> <span class="keyword">return</span> str.replace(<span class="regexp">/(^\s*)|(\s*$)/g</span>, <span class="string">""</span>)</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">// 1. value.toString()</span></span><br><span class="line"><span class="comment">// 2. String('123213') </span></span><br><span class="line"><span class="comment">// 3. '' + value</span></span><br></pre></td></tr></table></figure></li>
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<p><span>本文标题:</span><a href="/%E5%AE%9E%E7%8E%B0trim%E7%9A%843%E7%A7%8D%E6%96%B9%E6%B3%95.html">实现trim的3种方法</a></p>
<p><span>文章作者:</span><a href="/" title="访问 陈宇（cosyer） 的个人博客">陈宇（cosyer）</a></p>
<p><span>发布时间:</span>2018年10月29日 - 15:10</p>
<p><span>最后更新:</span>2018年12月15日 - 13:12</p>
<p><span>原始链接:</span><a href="/%E5%AE%9E%E7%8E%B0trim%E7%9A%843%E7%A7%8D%E6%96%B9%E6%B3%95.html" title="实现trim的3种方法">http://mydearest.cn/%E5%AE%9E%E7%8E%B0trim%E7%9A%843%E7%A7%8D%E6%96%B9%E6%B3%95.html</a>
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