国产chinesehd精品酒店,邱淑贞aa极毛片,国产在线色视频,玖玖爱zh综合伊人久久

今天，我們來一起學(xué)習(xí)一下如何把元素添加到元素的首個元素。

1.Array.unshift()

letfruits=["Apple","Banana","Mango"];fruits.unshift("Orange");console.log(fruits);//Prints["Orange","Apple","Banana","Mango"]fruits.unshift("Guava","Papaya");console.log(fruits);//Prints["Guava","Papaya","Orange","Apple","Banana","Mango"]

2.使用展開運算符(…)

varfruits=["Apple","Banana","Mango"];varmoreFruits=["Orange",...fruits];console.log(moreFruits);//Prints["Orange","Apple","Banana","Mango"]varsomeoMoreFruits=["Guava","Papaya",...moreFruits];console.log(someoMoreFruits);//Prints["Guava","Papaya","Orange","Apple","Banana","Mango"]console.log(fruits);//Prints["Apple","Banana","Mango"]

3.使用 Array.ｃｏｎｃａｔ()

我們還可以使用ｃｏｎｃａｔ()方法在開頭連接兩個(或更多)數(shù)組。

varfruits=["Apple","Banana","Mango"];varmoreFruits=["Orange"];varsomeoMoreFruits=["Guava","Papaya"];varallFruits=someoMoreFruits.ｃｏｎｃａｔ(moreFruits,fruits);console.log(allFruits);//Prints["Guava","Papaya","Orange","Apple","Banana","Mango"]

完~我是小智，我要去刷碗了，我們下期再見~

ps：【項目】淘寶項目邀請用戶即可獲取收益

ps：【活動】支付寶大額紅包點擊掃碼領(lǐng)取

ps：【本站主題】自適應(yīng)資訊類的網(wǎng)站主題