Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

JavaScript

var phone = prompt('Введите номер');
var lenPhone = phone.length;
var tt=phone.split('');
if(lenPhone == 12){
tt.splice(2,"", "(");
tt.splice(6,"", ")");
tt.splice(10,"", "-");
tt.splice(13,"", "-");
}else if(lenPhone == 13){
tt.splice(3,"", "(");
tt.splice(7,"", ")");
tt.splice(11,"", "-");
tt.splice(14,"", "-");
}
alert(tt.join(''))

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JSFiddle - React, Tailwind, and code Playground

JavaScript

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Use pre-released features

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