javascript - 使用单引号和连接的 JS 字符串有什么区别？

Question

我对这里发生的事情完全不知所措。以下两个字符串有什么区别？

var email = "From: [e-mail]\r\n";
email += "To: [e-mail]\r\n";
email += "Subject: Hello\r\n";
email += "\r\nEmpty";

console.log(email);

var email2 = 'From: [e-mail]\r\n \
To: [e-mail]\r\n \
Subject: Hello\r\n \
\r\nEmpty';

console.log(email2);

标签： javascript