JavaScript千分符---正则实现

一般在JavaScript中实现千分符，是使用切割+连接一顿操作

这里尝试一下使用正则快速实现千分符-----支持小数

 let num0 = '12'
 let num1 = '123'
 let num2 = '1234'
 let num3 = '123456789'
 let num4 = '1234567890'
 let num5 = '12345678901'
 let num6 = '123456789012'
 let num7 = '1234567890123'

 let r0 = num0.replace(/(\d{1,3})(?=(\d{3})+(?:[$|.]))/g, '$1,')
 let r1 = num1.replace(/(\d{1,3})(?=(\d{3})+(?:[$|.]))/g, '$1,')
 let r2 = num2.replace(/(\d{1,3})(?=(\d{3})+(?:[$|.]))/g, '$1,')
 let r3 = num3.replace(/(\d{1,3})(?=(\d{3})+(?:[$|.]))/g, '$1,')
 let r4 = num4.replace(/(\d{1,3})(?=(\d{3})+(?:[$|.]))/g, '$1,')
 let r5 = num5.replace(/(\d{1,3})(?=(\d{3})+(?:[$|.]))/g, '$1,')
 let r6 = num6.replace(/(\d{1,3})(?=(\d{3})+(?:[$|.]))/g, '$1,')
 let r7 = num7.replace(/(\d{1,3})(?=(\d{3})+(?:[$|.]))/g, '$1,')

 console.log(r0) //
 console.log(r1) //
 console.log(r2) // 1,234
 console.log(r3) // 123,456,789
 console.log(r4) // 1,234,567,890
 console.log(r5) // 12,345,678,901
 console.log(r6) // 123,456,789,012
 console.log(r7) // 1,234,567,890,123