<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8" />
		<title>Document</title>
	</head>
	<body>
		<script type="text/javascript" >
			let arr1 = [1,3,5,7,9]
			let arr2 = [2,4,6,8,10]
			console.log(...arr1); //展开一个数组
			let arr3 = [...arr1,...arr2]//连接数组
			
			//在函数中使用
			function sum(...numbers){
				return numbers.reduce((preValue,currentValue)=>{
					return preValue + currentValue
				})
			}
			console.log(sum(1,2,3,4));

			//构造字面量对象时使用展开语法
			let person = {name:'tom',age:18}
			let person2 = {...person}
			//console.log(...person); //报错，展开运算符不能展开对象
			person.name = 'jerry'
			console.log(person2);
			console.log(person);

			//合并
			let person3 = {...person,name:'jack',address:"地球"}
			console.log(person3);
			
		</script>
	</body>
</html>

js中的...运算符_JavaScript