方法一：forEach ``` var temp = []; var a = [1,2,3,4,5]; a.forEach(item=>{ temp.push(item) }) console.log(temp) ``` 方法二：concat ``` var a = [1,2,3,4,5] var b = [].concat(a); console.log(b); ``` 方法三：slice切割数组 ``` var a = [1,2,3,4,5]; var b = a.slice(0); console.log(b); ``` 方法四：map ``` var arr1 = [2, 3, 4]; var arr2 = arr1.map(function (value) { return value; }) console.log(arr2); ``` 方法五：...展开解构 ``` var a = [1,2,3,4,5]; var b = [...a]; console.log(b); ``` ``` var a = [1,2,3,4,5]; var temp =[]; temp.push(...a); console.log(temp) ```