## 复制数组 1.concat ~~~ var arr = [1,2,3,4,5]; var b = arr.concat(); console.log(b); ~~~ 2.slice ~~~ var c = arr.slice(); console.log(c); ~~~ 3.foreach循环 ~~~ var d = []; arr.forEach(ele=>{ d.push(ele); }) console.log(d); ~~~ > map遍历 4.展开语法 ~~~ var e = [...arr]; console.log(e); ~~~ 5.展开语法2 ~~~ temp.push(...a); console.log(temp); ~~~