freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/appending-variables-to-strings.md

id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
56533eb9ac21ba0edf2244ed	将变量附加到字符串	1	https://scrimba.com/c/cbQmZfa	16656	appending-variables-to-strings

--description--

我们不仅可以创建出多行的字符串，还可以使用加等号(+=)运算符来将变量追加到字符串。

--instructions--

设置变量someAdjective的值，并使用+=运算符把它追加到变量myStr上。

--hints--

someAdjective应该是一个至少包含三个字符的字符串。

assert(typeof someAdjective !== 'undefined' && someAdjective.length > 2);

使用+=操作符把someAdjective追加到myStr的后面。

assert(code.match(/myStr\s*\+=\s*someAdjective\s*/).length > 0);

--seed--

--after-user-code--

(function(){
  var output = [];
  if(typeof someAdjective === 'string') {
    output.push('someAdjective = "' + someAdjective + '"');
  } else {
    output.push('someAdjective is not a string');
  }
  if(typeof myStr === 'string') {
    output.push('myStr = "' + myStr + '"');
  } else {
    output.push('myStr is not a string');
  }
  return output.join('\n');
})();

--seed-contents--

// Change code below this line

var someAdjective;
var myStr = "Learning to code is ";

--solutions--

var someAdjective = "neat";
var myStr = "Learning to code is ";
myStr += someAdjective;