<script>
//合並數組
let arr1=[11,22,33,55]; let arr2=["aa","bb","cc","dd"]; // es5的合並
let arr=arr1.concat(arr2); console.log(arr) // [11, 22, 33, 55, "aa", "bb", "cc", "dd"]
// es6的合並
let newarr=[...arr1,...arr2] console.log(newarr) // [11, 22, 33, 55, "aa", "bb", "cc", "dd"]
// 函數內部有一個對象，arguments可以獲取到實參，但是一個偽數組
//Array[餓 rei]
function sun(){ console.log(arguments) //Arguments(8) [1, 2, 3, 4, 5, 6, 7, 9, callee: ƒ, Symbol(Symbol.iterator): ƒ] 他是一個偽數組
} sun(1,2,3,4,5,6,7,9); // 如何將函數內部的偽數組變為真實的數組 方法1
function sun(){ let ags=Array.prototype.slice.call(arguments); ags.push(150); console.log(ags); //[1, 2, 3, 4, 5, 6, 7, 9, 150]
} sun(1,2,3,4,5,6,7,9); // 如何將函數內部的偽數組變為真實的數組 方法2
function sun(){ let ags=[...arguments];//將偽數組百年未真實的數組
ags.push(150); console.log(ags); //[1, 2, 3, 4, 5, 6, 7, 9, 150]
} sun(1,2,3,4,5,6,7,9); // 總結擴展運算符是... [...變為真實數組的對象]
</script>
