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【ただのメモ】htmlのタグ内のテキストを変更する

Last updated at Posted at 2018-01-11

#CMSで自動作成されるHTMLをJavaScriptで強制的に書き換えるために書いたコード
##①htmlのソース(今回はthタグの数字を書き換える)

html
<!DOCTYPE html>
<html>
<head>
  <title>JavaScriptで強制的にテキストを書き換える</title>
</head>
<body>
<table>
  <tbody>
    <tr>
      <th class="number">2</th>
    </tr>
    <tr>
      <th class="number">3</th>
    </tr>
    <tr>
      <th class="number">4</th>
    </tr>
    <tr>
      <th class="number">5</th>
    </tr>
    <tr>
      <th class="number">6</th>
    </tr>
  </tbody>
</table>
</body>
</html>

##②数字を書き換えるためのJavaScript(今回は1引いた値に変更)

javascript
var childObj = document.getElementsByClassName("number");
var childList = Object.keys(childObj).map(function(key){return childObj[key]});
(function(){
  childList.forEach(
    function(value){
      var a = parseInt(value.innerText);
      value.innerText = a - 1;
    }
  );
})();
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