javascript - (_a = [""], _a.raw = [""],....); js一個小括號的意思是什麼？

Question

用typescript編譯出來的程式碼，如下：

typescript:

function test(template, name, age) {
    console.log(template);
    console.log(name);
    console.log(age);
}
let myname: string = "Keyon";
let myage: number = 18;
test`Hello, my name is ${myname}, I'm ${myage}.`;

編譯後的javascript:

function test(template, name, age) {
    console.log(template);
    console.log(name);
    console.log(age);
}
var myname = "Keyon";
var myage = 18;
(_a = ["Hello, my name is ", ", I'm ", "."], _a.raw = ["Hello, my name is ", ", I'm ", "."], test(_a, myname, myage));
var _a;

(_a = ["Hello, my name is ", ", I'm ", "."], _a.raw = ["Hello, my name is ", ", I'm ", "." ], test(_a, myname, myage));這裡直接一個小括號，裡面的像參數一樣的，是什麼意思？還有那個 _a.raw 是什麼？

Answer 1

括起來執行多個表達式

Answer 2

你可以在第一段程式碼的test函式內印下template.raw，應該就知道了