JS按钮点击工具

var yes = document.querySelectorAll('.yes');
var index = 0;
yes[index].style.display = 'block';
for (var i = 0; i < yes.length; i++) {
  yes[i].num = i;
  yes[i].onclick = function() {
    yes[index].style.display = '';
    index = this.num;
    yes[index].style.display = 'block';
  }
}