## 一、第一種：將鍵和值分別組合成新數組； ``` let ageDate = { "20歲": "15.0", "40-50歲": "8.0", "30-40歲": "23.0" } let newageName = [] let newageNum = [] for (let a in ageDate ) { newageName.push(a); //獲取到鍵的名稱,放進新數組里 newageNum.push(ageDate [a]);//獲取值的內容,放進新數組里 } console.log(newageName) //打印結果：["20歲", "40-50歲", "30-40歲"] ``` ## 二、第二種：將鍵和值重新組合成新的對象加入到新的數組里；for in ``` let ageDate = { "20歲": "15.0", "40-50歲": "8.0", "30-40歲": "23.0" } let newageName = [] for (let a in ageDate ) { let newObj = {}; newObj.name = a; // 新的鍵名,舊的鍵名變成值; newObj.value = ageDate[a]; //將值與新定義的鍵value配對; newageName.push(newObj); } console.log(newageName) ```