关于javascript: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#的字符串非凡解决

 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(' ')      // console.log(strArr)      // let content = strArr.map((item) => {      //   return Number(item) * Number(item)      // }).join(' ')      // console.log('content', content)      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 办法复制数组

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

(2) concat 办法复制数组

let copy = [1, 2, 3]let deepCopy = [].concat(copy)copy[2] = 4console.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) 扩大运算符办法复制数组

let copy = [1, 2, 3]let deepCopy = [...copy]copy[2] = 4console.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] = 4console.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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