--- id: 587d7daa367417b2b2512b6c title: 使用 join 方法将数组组合成字符串 challengeType: 1 forumTopicId: 18221 --- # --description-- `join`方法用来把数组中的所有元素放入一个字符串,并通过指定的分隔符参数进行分隔。 举个例子: ```js var arr = ["Hello", "World"]; var str = arr.join(" "); // Sets str to "Hello World" ``` # --instructions-- 在函数`sentensify`内用`join`方法(及其他方法)用字符串`str`中的单词造句,这个函数应返回一个字符串。举个例子,"I-like-Star-Wars" 会被转换成 "I like Star Wars"。在此挑战中请勿使用`replace`方法。 # --hints-- 应使用`join`方法。 ```js assert(code.match(/\.join/g)); ``` 不能使用`replace`方法。 ```js assert(!code.match(/\.replace/g)); ``` `sentensify('May-the-force-be-with-you')`应返回一个字符串 ```js assert(typeof sentensify('May-the-force-be-with-you') === 'string'); ``` `sentensify('May-the-force-be-with-you')`应返回`'May the force be with you'`。 ```js assert(sentensify('May-the-force-be-with-you') === 'May the force be with you'); ``` `sentensify('The.force.is.strong.with.this.one')`应返回`'The force is strong with this one'`。 ```js assert( sentensify('The.force.is.strong.with.this.one') === 'The force is strong with this one' ); ``` `sentensify('There,has,been,an,awakening')`应返回`'There has been an awakening'`。 ```js assert( sentensify('There,has,been,an,awakening') === 'There has been an awakening' ); ``` # --solutions--