掌握10种方法,提高你的代码可读性!
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javascript欄目介紹如何提高代碼可讀性的方法。
每個人都喜歡可讀性高的代碼,因為高可讀性的代碼總是能讓人眼前一亮!
就好比你向周圍的人說:快看,老師!周圍的人可能不屑一顧:老師有什么好看的?但如果你說:快看,蒼老師!那可能很多人會被你這句話所吸引。一字之差,結果截然不同。
代碼可讀性的魅力也是這樣,高可讀性的代碼,讓別人抑郁理解,能夠大量減少后期的維護時間。今天總結了10條常用的提高代碼可讀性的小方法,望大家不吝賜教。
1.語義化命名
在聲明變量時,盡量讓自己的變量名稱具有清晰的語義化,使他人一眼便能夠看出這個變量的含義,在這種情況下,可以減少注釋的使用。
示例:
// bad 別人看到會疑惑:這個list是什么的集合?const list = ['Teacher.Cang', 'Teacher.Bo', 'Teacher.XiaoZe'] // good 別人看到秒懂:原來是老師們的集合!const teacherList = ['Teacher.Cang', 'Teacher.Bo', 'Teacher.XiaoZe']復制代碼
2.各種類型命名
對于不同類型的變量值,我們可以通過一定的方式,讓別人一看看上去就知道他的值類型。
一般來說,對于boolean類型或者Array類型的值,是最好區分的。例如:boolean類型的值可以用isXXX、hasXXX、canXXX等命名;Array類型的值可以用xxxList、xxxArray等方式命名。
// badlet belongToTeacher = true;let teachers = ['Teacher.Cang', 'Teacher.Bo', 'Teacher.XiaoZe'];// goodlet isTeacher = true;let teacherList = ['Teacher.Cang', 'Teacher.Bo', 'Teacher.XiaoZe'];復制代碼
3.為常量聲明
我們在閱讀代碼時,如果你突然在代碼中看到一個字符串常量或者數字常量,你可能要花一定的時間去理解它的含義。如果使用const或者enum等聲明一下這些常量,可讀性將會有效得到提升。
示例:
// bad 別人看到會很疑惑:這個36D的含義是什么if (size === '36D') { console.log('It is my favorite');
}// good 別人看到秒懂:36D是最喜歡的大小const FAVORITE_SIZE = '36D';if (size === FAVORITE_SIZE) { console.log('It is my favorite');
}復制代碼
4.避免上下文依賴
在遍歷時,很多人會通過value、item甚至v等命名代表遍歷的變量,但是當上下文過長時,這樣的命名可讀性就會變得很差。我們要盡量做到使讀者即使不了解事情的來龍去脈的情況下,也能迅速理解這個變量代表的含義,而不是迫使讀者去記住邏輯的上下文。
const teacherList = ['Teacher.Cang', 'Teacher.Bo', 'Teacher.XiaoZe']// bad 別人看到循環的末尾處的item時需要在去上面看上下文理解item的含義teacherList.forEach(item => { // do something
// do something
// do …………
doSomethingWith(item);
})// good 別人看到最后一眼就能明白變量的意思是老師teacherList.forEach(teacher => { // do something
// do something
// do …………
doSomethingWith(teacher);
})復制代碼
5.避免冗余命名
某些情況的變量命名,例如給對象的屬性命名,直接命名該屬性的含義即可,因為本身這個屬性在對象中,無需再添加多余的前綴。
// badconst teacher = { teacherName: 'Teacher.Cang', teacherAge: 37, teacherSex: 'female',
};console.log(person.personName)// goodconst teacher = { name: 'Teacher.Cang', age: 37, sex: 'female',
};console.log(teacher.name)復制代碼
6.使用參數默認值
相比短路,使用ES6的參數默認值能讓人更輕易地理解未傳參數時參數的賦默認值。
// bad 需要多看一步才能理解是賦默認值function getTeacherInfo(teacherName) {
teacherName = teacherName || 'Teacher.Cang'; // do...}// good 一看就能看出是賦默認值function getTeacherInfo(teacherName = 'Teacher.Cang') { // do...}復制代碼
7.回調函數命名
很多人命名回調函數,尤其是為頁面或者DOM元素等設置事件監聽的回調函數時,習慣用事件的觸發條件進行命名,這樣做其實可讀性是比較差的,別人看到只知道你出發了這個函數,但卻需要花時間去理解這個函數做了什么。
我們在命名回調函數式,應當以函數所要執行的邏輯命名,讓別人清晰地理解這個回調函數所要執行的邏輯。
// bad 需要花時間去看代碼理解這個回調函數是做什么的<input type="button" value="提交" onClick="handleClick" />function handleClick() { // do...}// good 一眼就能理解這個回調函數是提交表單<input type="button" value="提交" onClick="handleSubmitForm" />;function handleSubmitForm() { // do...}復制代碼
8.減少函數的參數個數
一個函數如果參數的數量太多,使用的時候就難以記住每個參數的含義了,并且函數多個參數有順序限制,我們在調用時需要去記住每個次序的參數的含義。通常情況下我們一個函數的參數個數在1-2個為佳,盡量不要超過三個。
當函數的參數比較多時,我們可以將同一類的參數使用對象進行合并,然后將合并后的對象作為參數傳入,這樣在調用該函數時能夠很清楚地理解每個參數的含義。
// bad 調用時傳的參數難以理解含義,需要記住順序function createTeacher(name, sex, age, height, weight) { // do...}
createTeacher('Teacher.Cang', 'female', 37, 155, 45);// good 調用時雖然寫法略復雜了點,但各個參數含義一目了然,無需刻意記住順序function createTeacher({name, sex, age, height, weight}) { // do...}
createTeacher({ name: 'Teacher.Cang', sex: 'female', age: 37, height: 155, weight: 45})復制代碼
9.函數拆分
一個函數如果代碼太長,那么可讀性也是比較差的,我們應該盡量保持一個函數只處理一個功能,當邏輯復雜時將函數適當拆分。
// badfunction initData() { let resTeacherList = axios.get('/teacher/list');
teacherList = resTeacherList.data; const params = { pageSize: 20, pageNum: 1,
}; let resMovieList = axios.get('/movie/list', params);
movieList = resMovieList.data;
}// goodfunction getTeacherList() { let resTeacherList = axios.get('/teacher/list');
teacherList = resTeacherList.data;
}function getMovieList() { const params = { pageSize: 20, pageNum: 1,
}; let resMovieList = axios.get('/movie/list', params);
movieList = resMovieList.data;
}function initData() {
getTeacherList();
getMovieList();
}復制代碼
10.注重寫注釋
不寫注釋應該是很多開發者的一個惡習,看別人不寫注釋的代碼也是很多開發者最討厭的事情。
所以,無論是為了自己還是別人,都請注重編寫注釋。
// bad 不寫注釋要花大量時間理解這個函數的作用function formatNumber(num) { if (num < 1000) { return num;
} else { return `${(num / 1000).toFixed(1)}k`
}
}// good 有了注釋函數的作用和用法一目了然/**
* @param num
* @return num | x.xk
* @example formatNumber(1000);
* @description
* 小于1k不轉換
* 大于1k轉換為x.xk
*/function formatNumber(num) { if (num < 1000) { return num;
} else { return `${(num / 1000).toFixed(1)}k`
}
}復制代碼
提高代碼可讀性的代碼風格其實還有很多,以上筆者主要從變量命名、函數和注釋三個方面,總結了10條比較常用的提高代碼可讀性的方法,希望對大家有所幫助。如有補充,歡迎評論。
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