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forEachの中でasync awaitは使えない(コピペ例)

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forEachの中で非同期処理で詰まったので備忘録として書く

エラー例

```javascript console.log("before_forEach", this.datas);
  this.datas.forEach(async(data) => {
    //非同期処理
  });

  console.log("after_forEach", this.datas);

<h2>成功例</h2>

```javascript
      console.log("before_forEach", this.datas);

      for (let data of this.datas){
        //非同期処理
      });

      console.log("after_forEach", this.datas);

forで書き直せば、処理順はうまくいくはず!

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