JavaScript中提高效率的技巧一

1.生成随机颜色的两种方式

1）.生成RandomHexColor

const generateRandomHexColor = () => {
  return `#${Math.floor(Math.random() * 0xffffff).toString(16).padStart(6, '0')}`
}
generateRandomHexColor() // #a8277c
generateRandomHexColor() // #09c20c
generateRandomHexColor() // #dbc319

2）.生成随机RGBA

const generateRandomRGBA = () => {
  const r = Math.floor(Math.random() * 256)
  const g = Math.floor(Math.random() * 256)
  const b = Math.floor(Math.random() * 256)
  const a = Math.random().toFixed(2)
  return `rgba(${[ r, g, b, a ].join(',')})`
}
generateRandomRGBA() // rgba(242,183,70,0.21)
generateRandomRGBA() // rgba(65,171,97,0.72)
generateRandomRGBA() // rgba(241,74,149,0.33)

2.复制内容到剪贴板的两种方式

方式1

const copyToClipboard = (text) => navigator.clipboard && navigator.clipboard.writeText && navigator.clipboard.writeText(text)

copyToClipboard('hello medium')

方式2

const copyToClipboard = (content) => {
  const textarea = document.createElement("textarea")

  textarea.value = content
  document.body.appendChild(textarea)
  textarea.select()
  document.execCommand("Copy")
  textarea.remove()
}

copyToClipboard('hello medium')

3. 获取URL中的查询参数​​​​​​​

const parseQuery = (name) => {
  return new URL(window.location.href).searchParams.get(name)
}
​​​​​​​
// https://medium.com?name=fatfish&age=100
parseQuery('name') // fatfish
parseQuery('age') // 100
parseQuery('sex') // null

4.Please wait for a while

const timeout = (timeout) => new Promise((rs) => setTimeout(rs, timeout))

5.打乱数组

const shuffle = (array) => array.sort(() => 0.5 - Math.random())

shuffle([ 1, -1, 2, 3, 0, -4 ]) // [2, -1, -4, 1, 3, 0]
shuffle([ 1, -1, 2, 3, 0, -4 ]) // [3, 2, -1, -4, 0, 1]

6. 深拷贝一个对象

如何深拷贝对象？使用 StructuredClone 使其变得非常容易。

const obj = {
  name: 'fatfish',
  node: {
    name: 'medium',
    node: {
      name: 'blog'
    }
  }
}
const cloneObj = structuredClone(obj)
cloneObj.name = '1111'
cloneObj.node.name = '22222'
console.log(cloneObj)
/*
{
    "name": "1111",
    "node": {
        "name": "22222",
        "node": {
            "name": "blog"
        }
    }
}
*/
console.log(obj)
/*
{
    "name": "fatfish",
    "node": {
        "name": "medium",
        "node": {
            "name": "blog"
        }
    }
}
*/