javascript - 字符串中的 NodeJS v6.9.1 变量不起作用

Question

尝试学习NodeJS的基本功能，卡在append String to file with variable:

const fs = require('fs');
const os = require('os');

var user = os.userInfo();

fs.appendFile('test.txt', 'Hello ${user.username}!');

从 test.txt 我得到:

Hello ${user.username}!

这里出了什么问题？

Answer 1

您需要使用反引号 (`) 而不是 '

fs.appendFile('test.txt', `Hello ${user.username}!`);

Template literals

Template literals are enclosed by the back-tick (grave accent) character instead of double or single quotes.