SOURCE

const getPhone = (str) => str.replace(/[-\s]/g, '').slice(-11)
// 源数据
const repo = [
    '+86 18612345678',
    '8613898765421',
    '135-1234-5678',
    '+8615145698763',
    '+86 151-4569-8763'
]

for (const item of repo) {
    console.log(getPhone(item))
}