介绍
本文是在学习ES6时做的一些学习笔记,所有的笔记请查看:ES6 学习笔记
剩余参数
具体介绍在如下示例代码中,可结合代码学习:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
</style>
<body>
<script>
// 参数以数组得形式保存在了numbers变量中
// numbers: [1,2,3]
function sum(...numbers){
console.log(numbers);
return numbers.reduce((prev,curv) => prev+curv,0)
}
sum(1,2,3)
// rate: 0.89
// amounts :[12,34,25] 数组
function coverCurrency(rate,...amounts){
return amounts.map(amount=>amount*rate)
}
const amounts=coverCurrency(0.89,12,34,25)
// 变量的解构,可以通过剩余参数获取所有解构内容
const player=['jelly',123,5.1,6.7,3.4,8.9]
const [name,id,score] = player // 只能获取 [jelly,123,5.1]
const [name,id,...score] =player // 获取 [jelly,123,,5.1,6.7,3.4,8.9]
</script>
</body>
</html>