<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
console.log(arr3);
//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>
