問題描述

用typescript編譯出來的代碼，如下：

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));這里直接一個小括號，里邊的像參數一樣的，是什么意思？還有那個 _a.raw 是什么？

問題解答

括起來執行多個表達式

你可以在第一段代碼的test函數內打印下template.raw，應該就知道了