* [6.1](https://github.com/yuche/javascript#6.1)?字符串使用單引號?`''`?。 ~~~ // bad const name = "Capt. Janeway"; // good const name = 'Capt. Janeway'; ~~~ * [6.2](https://github.com/yuche/javascript#6.2)?字符串超過 80 個字節應該使用字符串連接號換行。 * [6.3](https://github.com/yuche/javascript#6.3)?注：過度使用字串連接符號可能會對性能造成影響。[jsPerf](http://jsperf.com/ya-string-concat)?和?[討論](https://github.com/airbnb/javascript/issues/40). ~~~ // bad const errorMessage = 'This is a super long error that was thrown because of Batman. When you stop to think about how Batman had anything to do with this, you would get nowhere fast.'; // bad const errorMessage = 'This is a super long error that was thrown because \ of Batman. When you stop to think about how Batman had anything to do \ with this, you would get nowhere \ fast.'; // good const errorMessage = 'This is a super long error that was thrown because ' + 'of Batman. When you stop to think about how Batman had anything to do ' + 'with this, you would get nowhere fast.'; ~~~ * [6.4](https://github.com/yuche/javascript#6.4)?程序化生成字符串時，使用模板字符串代替字符串連接。 > 為什么？模板字符串更為簡潔，更具可讀性。 ~~~ // bad function sayHi(name) { return 'How are you, ' + name + '?'; } // bad function sayHi(name) { return ['How are you, ', name, '?'].join(); } // good function sayHi(name) { return `How are you, ${name}?`; } ~~~