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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Errors/String_literal_EOL below:

SyntaxError: string literal contains an unescaped line break - JavaScript

SyntaxError: Invalid or unexpected token (V8-based)
SyntaxError: '' string literal contains an unescaped line break (Firefox)
SyntaxError: Unexpected EOF (Safari)

某处 js 解析字符串出错。字符串必须使用单引号或双引号来正确的关闭。在 Javascript 中使用单引号的字符和双引号的字符串是没有区别的。字符串用转义字符不是单引号就是双引。为解决这个错误，检查一下：

• 你字符串的引号是否成对。
• 你是否正确使用了转义序列
• 你的字符串是否在多行中解析正常。

在 javascript 中你不能够直接使用多行字符串赋值给一个变量。如下：

var longString = "This is a very long string which needs
                  to wrap across multiple lines because
                  otherwise my code is unreadable.";
// SyntaxError: unterminated string literal

可以使用"+"运算符，反斜杠，或模板字符串来代替多行。“+”运算符的使用如下：

var longString =
  "This is a very long string which needs " +
  "to wrap across multiple lines because " +
  "otherwise my code is unreadable.";

或者你可以使用“\”在每一行的末尾，以表示该字符串在下一行继续。要确保“\“之后没有没有空格和任何其他的字符，及缩进，否则该“\”将不会起作用。使用方法如下：

var longString =
  "This is a very long string which needs \
to wrap across multiple lines because \
otherwise my code is unreadable.";

另一种方式是使用 ES 2015 的环境所支持模板字符串（反引号` `）。

var longString = `This is a very long string which needs
                  to wrap across multiple lines because
                  otherwise my code is unreadable.`;

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