set去重
var demo = new Set([1,1,3,5,4,6]); console.log([...demo]); // [1, 3, 5, 4, 6]
合并两个数组,合并两个对象。
const a = [1,2,3]; const b = [1,5,6]; const c = a.concat(b);//[1,2,3,1,5,6] const obj1 = { a:1, } const obj2 = { b:1, } const obj = Object.assign({}, obj1, obj2);//{a:1,b:1}
改进
const a = [1,2,3]; const b = [1,5,6]; const c = [...new Set([...a,...b])];//[1,2,3,5,6] const obj1 = { a:1, } const obj2 = { b:1, } const obj = {...obj1,...obj2};//{a:1,b:1}