js一些方法记录

1.获取字符串中的元音

getYuan (str) {
  let arr = str.match(/[aeiou]/gi)
  return arr
}

2.将带#的字符串特殊处理

 parseComments (value) {
      var exp
      exp = /(#|＃)((?!#).)*(#|＃)/g
      value = value.replace(/<[^>]*?>(.*?)/gi, '').replace(/(.*?)<\/[^>]*?>/gi, '').replace(exp, (item) => {
        let newVal = '<span class="text-blue">' + item + '</span>'
        return newVal
      })
      return value
    }

3.平方每个数

this.squareNum(9119)
squareNum (str) {
  let strArr = (str + '').split('')
  let content = strArr.map((item) => {
    return Number(item) * Number(item)
  }).join('')
  return content
}

3.
console.log('is2', 'is2'.replace(/¹/gi, '')) // 2; 去掉字符串的非数字
console.log('sdf34', 'sdf34'.replace(/d/g, '')) // sdf; 去掉数字

4.数组的深拷贝
(1) slice 方法复制数组

let copy = [1, 2, 3]
let deepCopy = copy.slice()
copy[2] = 4
console.log('copy', copy) // [1,2,4]
console.log('deepCopy', deepCopy) // [1,2,3]

(2) concat 方法复制数组

let copy = [1, 2, 3]
let deepCopy = [].concat(copy)
copy[2] = 4
console.log('copy', copy) // [1,2,4]
console.log('deepCopy', deepCopy) // [1,2,3]

(3) 遍历数组

forEach 或者 for循环

(4) 扩展运算符 方法复制数组

let copy = [1, 2, 3]
let deepCopy = [...copy]
copy[2] = 4
console.log('copy', copy)
console.log('deepCopy', deepCopy)

(5) 转换成json再转换成对象

let copy = [1, 2, 3]
let deepCopy = JSON.parse(JSON.stringify(copy))
copy[2] = 4
console.log('copy', copy)
console.log('deepCopy', deepCopy)

5.对象的深拷贝
(1) for循环

let copy = {
  name: 'xiaoyingzi',
  sex: 'female',
  age: 25
}
let res = {}
for (let i in copy) {
  console.log('i=====', i)
  res[i] = copy[i]
}
console.log('res', res) 
copy.name = 'xiaoyouzi'
console.log('res', res)

(2) 转换成json再转换成对象

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1. 0-9 ↩