今天，我们来一起学习一下如何把元素添加到元素的首个元素。
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.使用展开运算符(…)
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()
我们还可以使用ｃｏｎｃａｔ()方法在开头连接两个(或更多)数组。
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，我们下期再见~
ps：【项目】淘宝项目邀请用户即可获取收益
ps：【活动】支付宝大额红包点击扫码领取
ps：【本站主题】自适应资讯类的网站主题
TAG:[db:关键词]
