你好，这里我使用了一个滑块，一个定制的滑块，我在这里使用双色前指针和后指针，然后我创建了一个重置按钮，重置输入（滑块输入）的值，它也工作得很好，但问题是颜色，当我们点击重置按钮时颜色没有重置。如何修复？

顺晟科技：

单击重置按钮时应再次调用，让它根据滑块值重新绘制元素的样式。

//Start FOnt Size Slider
function isOlderEdgeOrIE() {
  return (
    window.navigator.userAgent.indexOf("MSIE ") > -1 ||
    !!navigator.userAgent.match(/Trident.*rv\:11\./) ||
    window.navigator.userAgent.indexOf("Edge") > -1
  );
}

function valueTotalRatio(value, min, max) {
  return ((value - min) / (max - min)).toFixed(2);
}

function getLinearGradientCSS(ratio, leftColor, rightColor) {
  return [
    '-webkit-gradient(',
    'linear, ',
    'left top, ',
    'right top, ',
    'color-stop(' + ratio + ', ' + leftColor + '), ',
    'color-stop(' + ratio + ', ' + rightColor + ')',
    ')'
  ].join('');
}

function updateRangeEl(rangeEl) {
  var ratio = valueTotalRatio(rangeEl.value, rangeEl.min, rangeEl.max);

  rangeEl.style.backgroundImage = getLinearGradientCSS(ratio, '#8e2f58', '#c5c5c5');
}

function initRangeEl() {
  var rangeEl = document.querySelector('input[type=range]');
  var textEl = document.querySelector('.fntSz');

  /**
   * IE/Older Edge FIX
   * On IE/Older Edge the height of the <input type="range" />
   * is the whole element as oposed to Chrome/Moz
   * where the height is applied to the track.
   *
   */
  if (isOlderEdgeOrIE()) {
    rangeEl.style.height = "20px";
    // IE 11/10 fires change instead of input
    // https://stackoverflow.com/a/50887531/3528132
    rangeEl.addEventListener("change", function(e) {
      textEl.value = e.target.value;
    });
    rangeEl.addEventListener("input", function(e) {
      textEl.value = e.target.value;
    });
  } else {
    updateRangeEl(rangeEl);
    rangeEl.addEventListener("input", function(e) {
      updateRangeEl(e.target);
      textEl.value = e.target.value;
    });
  }
}

initRangeEl();
//End Font Size Slider



$('.resetbtn').click(function(){
      $('#slider, .fntSz').val(40);
});