总结一些能够提高开发效率的JS技巧,这些技巧很实用,觉得挺好,整理一下。
生成随机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,%}
无loop生成指定长度的数组
const List = len => [...new Array(len).keys()]
const list = List(10) // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
数组去重
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进制色值
const rgb2Hex = (r, g, b) => {
r = Math.max(Math.min(Number(r), 100), 0) * 2.55
g = Math.max(Math.min(Number(g), 100), 0) * 2.55
b = Math.max(Math.min(Number(b), 100), 0) * 2.55
r = ('0' + (Math.round(r) || 0).toString(16)).slice(-2)
g = ('0' + (Math.round(g) || 0).toString(16)).slice(-2)
b = ('0' + (Math.round(b) || 0).toString(16)).slice(-2)
return '#' + r + g + b
}
rgb2Hex(100, 50, 0) // "#ff7f00"
判断是否为质数
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
遍历类数组对象
const elements = document.querySelectorAll(selector);
[].prototype.forEach.call(elements, (el, idx, list) => {
console.log(el) // 元素节点
})
判断对象类型
const type = data => Object.prototype.toString.call(data).replace(/^\[object (.+)\]$/, '$1').toLowerCase()
type({}) // object