回答編集履歴
1
NaN対応
answer
CHANGED
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@@ -17,4 +17,27 @@
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<td class = "sample">30</td>
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</tr>
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</table>
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20
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```
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# NaN対応
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23
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```javascript
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24
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<script>
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25
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window.addEventListener('DOMContentLoaded', function(e){
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var v=[].map.call(document.querySelectorAll('.sample'),function(x){
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27
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return parseFloat(x.textContent)||0;
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}).reduce(function(prev,current){
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return prev+current;
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30
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});
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console.log(v);
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});
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</script>
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<table>
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<tr>
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<td class = "sample">10</td>
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<td class = "sample">20</td>
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<td class = "sample">30</td>
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<td class = "sample">abc</td>
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</tr>
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</table>
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20
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```
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