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- <div class="section" id="map">
- <h1>map<a class="headerlink" href="#map" title="Permalink to this headline">¶</a></h1>
- <div class="section" id="methods">
- <h2>Methods<a class="headerlink" href="#methods" title="Permalink to this headline">¶</a></h2>
- <dl class="function">
- <dt id="seed.KISSY.map">
- <tt class="descclassname">KISSY.</tt><tt class="descname">map</tt><big>(</big><big>)</big><a class="headerlink" href="#seed.KISSY.map" title="Permalink to this definition">¶</a></dt>
- <dd><div class="line-block">
- <div class="line">Array <strong>KISSY.map</strong> (arr,fn[,context])</div>
- <div class="line">创建一个新数组, 数组结果是在对每个原数组元素调用指定函数的返回值.</div>
- </div>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
- <li><strong>arr</strong> (<em>Array</em>) – 需要遍历的数组.</li>
- <li><strong>fn</strong> (<em>function</em>) – 能够根据原数组当前元素返回新数组元素的函数.</li>
- <li><strong>context</strong> (<em>object</em>) – 执行 <tt class="docutils literal"><span class="pre">fn</span></tt> 时的 <tt class="docutils literal"><span class="pre">this</span></tt> 值.</li>
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- <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">返回符合根据指定函数调用得到新数组</p>
- </td>
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- <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">Array</p>
- </td>
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- </table>
- <div class="admonition note">
- <p class="first admonition-title">Note</p>
- <p class="last">原数组保持不变</p>
- </div>
- <p>例如:</p>
- <div class="highlight-javascript"><div class="highlight"><pre><span class="kd">function</span> <span class="nx">makePseudoPlural</span><span class="p">(</span><span class="nx">single</span><span class="p">)</span> <span class="p">{</span>
- <span class="k">return</span> <span class="nx">single</span><span class="p">.</span><span class="nx">replace</span><span class="p">(</span><span class="sr">/o/g</span><span class="p">,</span> <span class="s2">"e"</span><span class="p">);</span>
- <span class="p">}</span>
- <span class="kd">var</span> <span class="nx">singles</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"foot"</span><span class="p">,</span> <span class="s2">"goose"</span><span class="p">,</span> <span class="s2">"moose"</span><span class="p">];</span>
- <span class="kd">var</span> <span class="nx">plurals</span> <span class="o">=</span> <span class="nx">S</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="nx">singles</span><span class="p">,</span> <span class="nx">makePseudoPlural</span><span class="p">);</span> <span class="c1">// => ["feet", "geese", "meese"]</span>
- <span class="kd">var</span> <span class="nx">a</span> <span class="o">=</span> <span class="nx">S</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="s2">"Hello World"</span><span class="p">,</span><span class="kd">function</span><span class="p">(</span><span class="nx">x</span><span class="p">)</span> <span class="p">{</span>
- <span class="k">return</span> <span class="nx">x</span><span class="p">.</span><span class="nx">charCodeAt</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>
- <span class="p">});</span> <span class="c1">// => [72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]</span>
- </pre></div>
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