[問題] 請問如何加總
https://jsfiddle.net/oxf6wj87/
請問一下我要在頁面做計算加總
希望在total欄位 印出加總金額
但目前我只能印出單欄的價格
請問我哪邊需要修改才能做出我要的效果呢
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