1、形参初始值
给函数形参赋默认的初始值,例如c=10, 调用的时候,如果c传了值,就用传的值,没有,就用默认值
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605082848214-228047403.png)
2、与解构赋值结合
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605083207188-1865924203.png)
解构赋值也可以设置形参初始值 没有传,就用默认,传了就用传的值
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605083335013-1089616646.png)
3、rest参数
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605083702324-1581016213.png)
上面的打印结果是一个对象
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605083714095-1160274756.png)
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605084221770-1384157137.png)
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605084235652-563451109.png)
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605083904825-766436304.png)
![](https://www.icode9.com/i/l/?n=22&i=blog/2468373/202206/2468373-20220605083923386-963675703.png)
...args 必写
这里打印的结果是一个数组,数组的好处就是可以使用他的一些方法, 例如 filter, some, every, map等
标签:ES6,形参,初始值,rest,解构,函数参数,默认值,赋值
来源: https://www.cnblogs.com/hpjk07/p/16343339.html