展开运算符

展开运算符

展开运算符（用三个连续的点 (...) 表示）是 ES6 中的新概念，使你能够将字面量对象展开为多个元素

const books = ["Don Quixote", "The Hobbit", "Alice in Wonderland", "Tale of Two Cities"];
console.log(...books);

Prints: Don Quixote The Hobbit Alice in Wonderland Tale of Two Cities

展开运算符的一个用途是结合数组。

如果你需要结合多个数组，在有展开运算符之前，必须使用 Array的 concat() 方法。

const fruits = ["apples", "bananas", "pears"];
const vegetables = ["corn", "potatoes", "carrots"];
const produce = fruits.concat(vegetables);
console.log(produce);

使用展开符来结合数组

const fruits = ["apples", "bananas", "pears"];
const vegetables = ["corn", "potatoes", "carrots"];
const produce = [...fruits,...vegetables];
console.log(produce);