(_a = [""], _a.raw = [""],....); js一个小括号的是什么意思？

Question

用typescript编译出来的代码，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}.`;

编译后的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));这里直接一个小括号，里边的像参数一样的，是什么意思？还有那个 _a.raw 是什么？

Answer 1

你可以在第一段代码的test函数内打印下template.raw，应该就知道了