ES6--数组合并

1. ES5中合并数组

    var array_1 = ['reese','root','fusco'];

    var array_2 = ['finch','shaw','bear'].concat(array_1);//["finch", "shaw", "bear", "reese", "root", "fusco"]

这样两个数组就合体了。

2. ES6中合并数组

  var array_1 = ['reese','root','fusco'];

  var array_2 =['finch','shaw','bear',...array_1];//["finch", "shaw", "bear", "reese", "root", "fusco"]

 ps: ...运算符在ES6--默认参数中也有用到。