JavaScript中往数组开头添加新元素的方法有哪些

这篇文章主要介绍JavaScript中往数组开头添加新元素的方法有哪些，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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"]

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