6. 字符串
最后更新于：2022-04-01 21:12:11
* [6.1](https://github.com/yuche/javascript#6.1) 字符串使用单引号 `''` 。
~~~
// bad
const name = "Capt. Janeway";
// good
const name = 'Capt. Janeway';
~~~
* [6.2](https://github.com/yuche/javascript#6.2) 字符串超过 80 个字节应该使用字符串连接号换行。
* [6.3](https://github.com/yuche/javascript#6.3) 注：过度使用字串连接符号可能会对性能造成影响。[jsPerf](http://jsperf.com/ya-string-concat) 和 [讨论](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) 程序化生成字符串时，使用模板字符串代替字符串连接。
> 为什么？模板字符串更为简洁，更具可读性。
~~~
// 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}?`;
}
~~~
';