ES5 => 筛选功能 Array.prototypefilter()：
代码：
var words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present']; const result = words.filter(word => word.length > 6); console.log(result);
// expected output: Array ["exuberant", "destruction", "present"]
ES5 => 数组的处理 Array.prototype.map()
代码：
var array1 = [1, 4, 9, 16]; // pass a function to map
const map1 = array1.map(x => x * 2); console.log(map1);
// expected output: Array [2, 8, 18, 32]