扁平风格加减乘除计算器js代码

代码片段：

<button class="num" data-num="7">7</button>
  <button class="num" data-num="8">8</button>
  <button class="num" data-num="9">9</button>
  <button data-ops="加上" class="ops">+</button>

  <button class="num" data-num="4">4</button>
  <button class="num" data-num="5">5</button>
  <button class="num" data-num="6">6</button>
  <button data-ops="减去" class="ops">-</button>

  <button class="num" data-num="1">1</button>
  <button class="num" data-num="2">2</button>
  <button class="num" data-num="3">3</button>
  <button data-ops="乘以" class="ops">*</button>

  <button class="num" data-num="0">0</button>
  <button class="num" data-num=".">.</button>
  <button id="equals" class="equals" data-result="">=</button>
  <button data-ops="除以" class="ops">/</button>

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