javascript实现前端成语点击验证优化

//事件委托
var verifyArr = [];
var str = null;
var timer = null;
var a = 0;
var idiomBox = document.querySelector('.idiom_box');
clearTimeout(timer)
idiomBox.onclick = function (e) {
 
 e.target ? e.srcElement : e.target;
 console.log(e.pageX);
 console.log(e.offsetX)
 var radio_left = event.pageX-$(this).offset().left-15+'px';
 var radio_top =event.pageY-$(this).offset().top-15+'px'
 if (e.target.tagName == 'SPAN') {
  a++;
  console.log(a)
  let rad=$(`<div class='radio'>${a}</div>`)
  rad.css({
   left:radio_left,
   top:radio_top
  })
  $('.idiom_box').append(rad)
  // console.log(e.target.innerText);
  verifyArr.push(e.target.innerText);
  str = verifyArr.join('')
  if (str.length === randomIdiom.length) {
   if (str == randomIdiom) {
    // alert('验证成功！！')
    $('.verify_box').html('验证成功');
    idiomBox.onclick = false //验证成功就不能再点了。
   } else {
    $('.verify_box').html('验证失败')
    timer = setTimeout(() => {
     location.reload()
    }, 1000);
   }
  }
 } else {
  alert('请点击有效区域')
 }
}

.radio{
 background-color: #1abd6c;
   color: #fff;
   z-index: 9999;
   width: 30px;
   height: 30px;
   text-align: center;
   line-height: 30px;
   border-radius: 50%;
   position: absolute;
  z-index: 10;
  line-height: 30px;
  color: white;
}