共计 2074 个字符，预计需要花费 6 分钟才能阅读完成。
- 格式化货币 ( 仅转换小数点前的整数局部 )
实现成果，遵循的准则： - ==> 123,456,789
123456789.1234 ==> 123,456,789.123
const formatMoney = (money) =>{return money.replace( new RegExp( `(?!^)(?=(\\d{3})+${money.includes('.') ? '\\.' : '$'})`, 'g'), ',' ) )
}
formatMoney('123456789') // '123,456,789'
formatMoney('123456789.123') // '123,456,789.123'
formatMoney('123') // '123'
formatMoney('123456789.123456')//'123,456,789.123456'- 实现 trim 性能的两种形式
去掉字符串首尾的空格
办法 1：
const trim1 = (str) => {return str.replace( /^\s*|s*$/g, '')
}
const string = 'hello world'
const noSpaceString = 'hello world'
const trimString = trim1(string)
console.log(string) // hello world
console.log(trimString, trimString === noSpaceString)//hello world, true
console.log(string) // hello world 办法 2：
const trim2 = (str) => {return str.replace(/^\s*(.*?)\s*$/g, '$1')
}
const string = 'hello medium'
const noSpaceString = 'hello medium'
const trimString = trim2(string)
console.log(string) // hello medium
console.log(trimString, trimString === noSpaceString)//hello medium,true
console.log(string)// hello medium - 解析链接上的搜寻参数
// url https://qianlongo.github.io/vue-demos/dist/index.html?name=fatfish&age=100#/home
const getQueryByName = (name) => {const queryNameRegex = new RegExp(`[?&]${name}=([^&]*)(&|$)`)
const queryNameMatch = window.location.search.match(queryNameRegex)
return queryNameMatch ? decodeURIComponent(queryNameMatch[1]) : ''
}
const name = getQueryByName('name')
const age = getQueryByName('age')
console.log(name, age) // fatfish, 100- 驼峰式字符串
示例：
foo Bar => fooBar
foo-bar—- => fooBar
foo_bar__ => fooBar
const camelCase = (string) => {const camelCaseRegex = /[-_\s]+(.)?/g
return string.replace(camelCaseRegex, (match, char) => {return char ? char.toUpperCase() : ''
})
}
console.log(camelCase('foo Bar')) // fooBar
console.log(camelCase('foo-bar--')) // fooBar
console.log(camelCase('foo_bar__')) // fooBar- 将字符串的首字母转换为大写
请将 hello world 转换为 Hello World。
const capitalize = (string) => {const capitalizeRegex = /(?:^|\s+)\w/g
return string.toLowerCase().replace(capitalizeRegex, (match) => match.toUpperCase())
}
console.log(capitalize('hello world')) // Hello World
console.log(capitalize('hello WORLD')) // Hello World- 依照 3 -4- 4 格局划分电话号码
let mobile = '18379836654'
let mobileReg = /(?=(\d{4})+$)/g
console.log(mobile.replace(mobileReg, '-')) // 183-7983-6654正文完