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()
let fruits = ["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(…)
var fruits = ["Apple", "Banana", "Mango"];var moreFruits = ["Orange", ...fruits];console.log(moreFruits);// Prints ["Orange", "Apple", "Banana", "Mango"] var someoMoreFruits = ["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。
var fruits = ["Apple", "Banana", "Mango"];var moreFruits = ["Orange"];var someoMoreFruits = ["Guava", "Papaya"];var allFruits = 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~
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