(ES6)扩展运算符使用场景

...扩展运算符 功能

...扩展运算符能将数组转换为逗号分隔的参数序列

扩展运算符 使用场景

1. 数组的合并

   const arr1 = ['a','b']
   const arr2 = ['c','d']
   const arr = [...arr1 , ...arr2]
   console.log(arr)    //['a','b','c','d']
   

2. 数组的克隆（浅拷贝）

   const arr1 = ['a','b','c']
   const arr2 = [...arr1]
   console.log(arr2)   //['a','b','c']
   

3. 将伪数组转为真正的数组

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