- 作者:陳大魚頭
- github: KRISACHAN
魚頭總結一些能夠提高開發效率的JS技巧,這些技巧很實用,覺得挺好,想推薦給大家,所以有了這篇文章。
生成隨機UID
const genUid = () => {
var length = 20
var soupLength = genUid.soup_.length
var id = []
for (var i = 0; i < length; i++) {
id[i] = genUid.soup_.charAt(Math.random() * soupLength)
}
return id.join('')
}
genUid.soup_ = '!#$%()*+,-./:;=?@[]^_`{|}~ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
genUid() // ;l`yCPc9A8IuK}?N6,%}
無loop生成指定長度的數組
const List = len => [...new Array(len).keys()]
const list = List(10) // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
一行代碼去重數組
const list = [1, 1, 2, 3, 6, 45, 8, 5, 4, 6, 5]
const uniqueList = [...new Set(list)] // [1, 2, 3, 6, 45, 8, 5, 4]
RGB色值生成16進制色值
const rgb2Hex = rgb => {
let rgbList = rgb.toString().match(/\d+/g)
let hex = '#'
for (let i = 0, len = rgbList.length; i < len; ++i) {
hex += ('0' + Number(rgbList[i]).toString(16)).slice(-2)
}
return hex
};
rgb2Hex('100, 50, 0') // '#643200'
顏色混合
const colourBlend = (c1, c2, ratio) => {
ratio = Math.max(Math.min(Number(ratio), 1), 0)
let r1 = parseInt(c1.substring(1, 3), 16)
let g1 = parseInt(c1.substring(3, 5), 16)
let b1 = parseInt(c1.substring(5, 7), 16)
let r2 = parseInt(c2.substring(1, 3), 16)
let g2 = parseInt(c2.substring(3, 5), 16)
let b2 = parseInt(c2.substring(5, 7), 16)
let r = Math.round(r1 * (1 - ratio) + r2 * ratio)
let g = Math.round(g1 * (1 - ratio) + g2 * ratio)
let b = Math.round(b1 * (1 - ratio) + b2 * ratio)
r = ('0' + (r || 0).toString(16)).slice(-2)
g = ('0' + (g || 0).toString(16)).slice(-2)
b = ('0' + (b || 0).toString(16)).slice(-2)
return '#' + r + g + b
}
colourBlend('#ff0000', '#3333ff', 0.5) // "#991a80"
判斷是否爲質數
const mathIsPrime = n => {
if (n === 2 || n === 3) {
return true
}
if (isNaN(n) || n <= 1 || n % 1 != 0 || n % 2 == 0 || n % 3 == 0) {
return false;
}
for (let x = 6; x <= Math.sqrt(n) + 1; x += 6) {
if (n % (x - 1) == 0 || n % (x + 1) == 0) {
return false
}
}
return true
}
mathIsPrime(0) // true
遍歷類數組對象
const elements = document.querySelectorAll(selector);
[].prototype.forEach.call(elements, (el, idx, list) => {
console.log(el) // 元素節點
})
判斷對象類型
const type = data => Object.prototype.toString.call(data).replace(/^\[object (.+)\]$/, '$1').toLowerCase()
type({}) // object
優化多層判斷條件
const getScore = score => {
const scoreData = new Array(101).fill(0)
.map((data, idx) => ([idx, () => (idx < 60 ? '不及格' : '及格')]))
const scoreMap = new Map(scoreData)
return (scoreMap.get(score)
? scoreMap.get(score)()
: '未知分數')
}
getScore(30) // 不及格
時間格式化
const dateFormatter = (formatter, date) => {
date = (date ? new Date(date) : new Date)
const Y = date.getFullYear() + '',
M = date.getMonth() + 1,
D = date.getDate(),
H = date.getHours(),
m = date.getMinutes(),
s = date.getSeconds()
return formatter.replace(/YYYY|yyyy/g, Y)
.replace(/YY|yy/g, Y.substr(2, 2))
.replace(/MM/g, (M < 10 ? '0' : '') + M)
.replace(/DD/g, (D < 10 ? '0' : '') + D)
.replace(/HH|hh/g, (H < 10 ? '0' : '') + H)
.replace(/mm/g, (m < 10 ? '0' : '') + m)
.replace(/ss/g, (s < 10 ? '0' : '') + s)
}
dateFormatter('YYYY-MM-DD HH:mm', '1995/02/15 13:55') // 1995-02-15 13:55
後記
以上十個技巧都是我在日常開發中經常用到的一些代碼片段,善用這些技巧,可以大大減少我們的開發時間。如果此時正在看文章的你也有類似的技巧心得,不妨在下方留言來分享給大家。
如果你、喜歡探討技術,或者對本文有任何的意見或建議,你可以掃描下方二維碼,關注微信公衆號“魚頭的Web海洋”,隨時與魚頭互動。歡迎!衷心希望可以遇見你。