freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/escape-sequences-in-strings.md

id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
56533eb9ac21ba0edf2244b6	转义字符	1	https://scrimba.com/c/cvmqRh6	17567	escape-sequences-in-strings

--description--

引号不是字符串中唯一可以被转义（escaped）的字符。 Escape sequences allow you to use characters you may not otherwise be able to use in a string.

代码	输出
\'	单引号
\"	双引号
\\	反斜杠
\n	换行符
\t	制表符
\r	回车
\b	退格
\f	换页符

Note that the backslash itself must be escaped in order to display as a backslash.

--instructions--

Assign the following three lines of text into the single variable myStr using escape sequences.

FirstLine
    \SecondLine
ThirdLine

You will need to use escape sequences to insert special characters correctly. You will also need to follow the spacing as it looks above, with no spaces between escape sequences or words.

Note: The indentation for SecondLine is achieved with the tab escape character, not spaces.

--hints--

myStr should not contain any spaces

assert(!/ /.test(myStr));

myStr should contain the strings FirstLine, SecondLine and ThirdLine (remember case sensitivity)

assert(
  /FirstLine/.test(myStr) && /SecondLine/.test(myStr) && /ThirdLine/.test(myStr)
);

FirstLine should be followed by the newline character \n

assert(/FirstLine\n/.test(myStr));

myStr should contain a tab character \t which follows a newline character

assert(/\n\t/.test(myStr));

SecondLine should be preceded by the backslash character \

assert(/\\SecondLine/.test(myStr));

There should be a newline character between SecondLine and ThirdLine

assert(/SecondLine\nThirdLine/.test(myStr));

myStr should only contain characters shown in the instructions

assert(myStr === 'FirstLine\n\t\\SecondLine\nThirdLine');

--seed--

--seed-contents--

const myStr = ""; // Change this line

--solutions--

const myStr = "FirstLine\n\t\\SecondLine\nThirdLine";