e
let currentBtn;
let btns = document.querySelectorAll('button[data-type="def"]');
let startBtn = document.querySelector('button[data-type="start"]');
btns.forEach(e=>{
e.addEventListener('click', function(){
currentBtn = this;
})
})
startBtn.addEventListener('click', function(){
window[currentBtn.getAttribute('data-func')]()
})
function func1(){
alert('1 func')
}
function func2(){
alert('2 func')
}
function func3(){
alert('3 func')
}
function func4(){
alert('4 func')
}