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47 lines
1.3 KiB
HTML
47 lines
1.3 KiB
HTML
<p>请你写一个函数 <code>createCounter</code>. 这个函数接收一个初始的整数值 <code>init</code> 并返回一个包含三个函数的对象。</p>
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<p>这三个函数是：</p>
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<ul>
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<li><code>increment()</code> 将当前值加 1 并返回。</li>
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<li><code>decrement()</code> 将当前值减 1 并返回。</li>
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<li><code>reset()</code> 将当前值设置为 <code>init</code> 并返回。</li>
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</ul>
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<p> </p>
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<p><strong class="example">示例 1：</strong></p>
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<pre>
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<b>输入：</b>init = 5, calls = ["increment","reset","decrement"]
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<b>输出：</b>[6,5,4]
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<strong>解释：</strong>
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const counter = createCounter(5);
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counter.increment(); // 6
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counter.reset(); // 5
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counter.decrement(); // 4
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</pre>
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<p><strong class="example">示例 2：</strong></p>
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<pre>
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<b>输入：</b>init = 0, calls = ["increment","increment","decrement","reset","reset"]
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<b>输出：</b>[1,2,1,0,0]
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<strong>解释：</strong>
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const counter = createCounter(0);
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counter.increment(); // 1
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counter.increment(); // 2
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counter.decrement(); // 1
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counter.reset(); // 0
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counter.reset(); // 0
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>-1000 <= init <= 1000</code></li>
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<li><code>总调用次数不会超过 1000</code></li>
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</ul>
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