一款基于jquery带百分比的响应式进度加载条

<h1>
        Battle.net <b>style progress bar</b></h1>
    <div class="progress">
        <b class="progress__bar"><span class="progress__text">Progress: <em>0%</em> </span>
        </b>
    </div>

.progress {
  font-size: 1.2em;
  height: 20px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 2px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.progress--active .progress__bar {
  opacity: 1;
}
.progress__text {
  width: 20em;
  padding: 0 0.9em;
  position: absolute;
}
.progress__text em {
  font-style: normal;
}
.progress__bar {
  color: white;
  font-size: 12px;
  font-weight: normal;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.6);
  line-height: 19px;
  display: block;
  position: relative;
  top: -1px;
  left: -1px;
  width: 0%;
  height: 100%;
  opacity: 0;
  border: 1px solid;
  border-radius: 2px 0 0 2px;
  background-size: 100px 30px, 130px 30px, 130px 30px;
  background-position: -20% center, right center, left center;
  background-repeat: no-repeat, no-repeat, no-repeat;
  -webkit-transition: opacity 0.2s ease, width 0.8s ease-out, background-color 1s ease, border-color 0.3s ease, box-shadow 1s ease;
          transition: opacity 0.2s ease, width 0.8s ease-out, background-color 1s ease, border-color 0.3s ease, box-shadow 1s ease;
  -webkit-animation: pulse 2s ease-out infinite;
          animation: pulse 2s ease-out infinite;
  background-color: rgba(201, 4, 20, 0.95);
  background-image: -webkit-linear-gradient(0deg, rgba(226, 4, 22, 0) 10%, rgba(250, 6, 26, 0.8) 30%, #fb1f31 70%, rgba(250, 6, 26, 0.8) 80%, rgba(226, 4, 22, 0) 90%), -webkit-linear-gradient(left, rgba(251, 31, 49, 0) 0%, #fb1f31 100%), -webkit-linear-gradient(right, rgba(251, 31, 49, 0) 0%, #fb1f31 100%);
  background-image: linear-gradient(90deg, rgba(226, 4, 22, 0) 10%, rgba(250, 6, 26, 0.8) 30%, #fb1f31 70%, rgba(250, 6, 26, 0.8) 80%, rgba(226, 4, 22, 0) 90%), linear-gradient(to right, rgba(251, 31, 49, 0) 0%, #fb1f31 100%), linear-gradient(to left, rgba(251, 31, 49, 0) 0%, #fb1f31 100%);
  border-color: #fb3848;
  box-shadow: 0 0 0.6em #fa061a inset, 0 0 0.4em #e20416 inset, 0 0 0.5em rgba(201, 4, 20, 0.5), 0 0 0.1em rgba(254, 206, 210, 0.5);
}
.progress__bar--orange {
  background-color: rgba(201, 47, 0, 0.95);
  background-image: -webkit-linear-gradient(0deg, rgba(227, 53, 0, 0) 10%, rgba(252, 59, 0, 0.8) 30%, #ff4d17 70%, rgba(252, 59, 0, 0.8) 80%, rgba(227, 53, 0, 0) 90%), -webkit-linear-gradient(left, rgba(255, 77, 23, 0) 0%, #ff4d17 100%), -webkit-linear-gradient(right, rgba(255, 77, 23, 0) 0%, #ff4d17 100%);
  background-image: linear-gradient(90deg, rgba(227, 53, 0, 0) 10%, rgba(252, 59, 0, 0.8) 30%, #ff4d17 70%, rgba(252, 59, 0, 0.8) 80%, rgba(227, 53, 0, 0) 90%), linear-gradient(to right, rgba(255, 77, 23, 0) 0%, #ff4d17 100%), linear-gradient(to left, rgba(255, 77, 23, 0) 0%, #ff4d17 100%);
  border-color: #ff6030;
  box-shadow: 0 0 0.6em #fc3b00 inset, 0 0 0.4em #e33500 inset, 0 0 0.5em rgba(201, 47, 0, 0.5), 0 0 0.1em rgba(255, 214, 201, 0.5);
}
.progress__bar--yellow {
  background-color: rgba(232, 158, 0, 0.95);
  background-image: -webkit-linear-gradient(0deg, rgba(255, 174, 2, 0) 10%, rgba(255, 183, 28, 0.8) 30%, #ffbf36 70%, rgba(255, 183, 28, 0.8) 80%, rgba(255, 174, 2, 0) 90%), -webkit-linear-gradient(left, rgba(255, 191, 54, 0) 0%, #ffbf36 100%), -webkit-linear-gradient(right, rgba(255, 191, 54, 0) 0%, #ffbf36 100%);
  background-image: linear-gradient(90deg, rgba(255, 174, 2, 0) 10%, rgba(255, 183, 28, 0.8) 30%, #ffbf36 70%, rgba(255, 183, 28, 0.8) 80%, rgba(255, 174, 2, 0) 90%), linear-gradient(to right, rgba(255, 191, 54, 0) 0%, #ffbf36 100%), linear-gradient(to left, rgba(255, 191, 54, 0) 0%, #ffbf36 100%);
  border-color: #ffc74f;
  box-shadow: 0 0 0.6em #ffb71c inset, 0 0 0.4em #ffae02 inset, 0 0 0.5em rgba(232, 158, 0, 0.5), 0 0 0.1em rgba(255, 248, 232, 0.5);
}
.progress__bar--green {
  background-color: rgba(0, 178, 23, 0.95);
  background-image: -webkit-linear-gradient(0deg, rgba(0, 203, 26, 0) 10%, rgba(0, 229, 30, 0.8) 30%, #00fe21 70%, rgba(0, 229, 30, 0.8) 80%, rgba(0, 203, 26, 0) 90%), -webkit-linear-gradient(left, rgba(0, 254, 33, 0) 0%, #00fe21 100%), -webkit-linear-gradient(right, rgba(0, 254, 33, 0) 0%, #00fe21 100%);
  background-image: linear-gradient(90deg, rgba(0, 203, 26, 0) 10%, rgba(0, 229, 30, 0.8) 30%, #00fe21 70%, rgba(0, 229, 30, 0.8) 80%, rgba(0, 203, 26, 0) 90%), linear-gradient(to right, rgba(0, 254, 33, 0) 0%, #00fe21 100%), linear-gradient(to left, rgba(0, 254, 33, 0) 0%, #00fe21 100%);
  border-color: #19ff37;
  box-shadow: 0 0 0.6em #00e51e inset, 0 0 0.4em #00cb1a inset, 0 0 0.5em rgba(0, 178, 23, 0.5), 0 0 0.1em rgba(178, 255, 188, 0.5);
}
.progress__bar--blue {
  background-color: rgba(18, 135, 204, 0.95);
  background-image: -webkit-linear-gradient(0deg, rgba(20, 151, 227, 0) 10%, rgba(37, 162, 236, 0.8) 30%, #3dacee 70%, rgba(37, 162, 236, 0.8) 80%, rgba(20, 151, 227, 0) 90%), -webkit-linear-gradient(left, rgba(61, 172, 238, 0) 0%, #3dacee 100%), -webkit-linear-gradient(right, rgba(61, 172, 238, 0) 0%, #3dacee 100%);
  background-image: linear-gradient(90deg, rgba(20, 151, 227, 0) 10%, rgba(37, 162, 236, 0.8) 30%, #3dacee 70%, rgba(37, 162, 236, 0.8) 80%, rgba(20, 151, 227, 0) 90%), linear-gradient(to right, rgba(61, 172, 238, 0) 0%, #3dacee 100%), linear-gradient(to left, rgba(61, 172, 238, 0) 0%, #3dacee 100%);
  border-color: #54b6f0;
  box-shadow: 0 0 0.6em #25a2ec inset, 0 0 0.4em #1497e3 inset, 0 0 0.5em rgba(18, 135, 204, 0.5), 0 0 0.1em rgba(225, 242, 252, 0.5);
}
.progress__bar:before, .progress__bar:after {
  content: "";
  position: absolute;
  right: -1px;
  top: -10px;
  width: 1px;
  height: 40px;
}
.progress__bar:before {
  width: 7px;
  right: -4px;
  background: -webkit-radial-gradient(center, ellipse, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0) 75%);
  background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0) 75%);
}
.progress__bar:after {
  background: -webkit-linear-gradient(top, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.3) 25%, rgba(255, 255, 255, 0.3) 75%, rgba(255, 255, 255, 0) 100%);
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.3) 25%, rgba(255, 255, 255, 0.3) 75%, rgba(255, 255, 255, 0) 100%);
}
.progress--complete .progress__bar {
  -webkit-animation: none;
          animation: none;
  border-radius: 2px;
}
.progress--complete .progress__bar:after, .progress--complete .progress__bar:before {
  opacity: 0;
}

@-webkit-keyframes pulse {
  0% {
    background-position: -50% center, right center, left center;
  }
  100% {
    background-position: 150% center, right center, left center;
  }
}

@keyframes pulse {
  0% {
    background-position: -50% center, right center, left center;
  }
  100% {
    background-position: 150% center, right center, left center;
  }
}
body, html {
  color: white;
  padding: 20px 50px;
  background: #131c23;
  font-family: Roboto;
}

h1 {
  font-weight: 900;
  line-height: 1em;
  margin: 0.5em 0;
}

h1 b {
  font-weight: 100;
}

  var $progress = $(".progress"),
    $bar = $(".progress__bar"),
    $text = $(".progress__text"),
    percent = 0,
    update,
    resetColors,
    speed = 200,
    orange = 30,
    yellow = 55,
    green = 85,
    timer;

        resetColors = function () {

            $bar
    .removeClass("progress__bar--green")
    .removeClass("progress__bar--yellow")
    .removeClass("progress__bar--orange")
    .removeClass("progress__bar--blue");

            $progress
    .removeClass("progress--complete");

        };

        update = function () {

            timer = setTimeout(function () {

                percent += Math.random() * 1.8;
                percent = parseFloat(percent.toFixed(1));

                $text.find("em").text(percent + "%");

                if (percent >= 100) {

                    percent = 100;
                    $progress.addClass("progress--complete");
                    $bar.addClass("progress__bar--blue");
                    $text.find("em").text("Complete");

                } else {

                    if (percent >= green) {
                        $bar.addClass("progress__bar--green");
                    }

                    else if (percent >= yellow) {
                        $bar.addClass("progress__bar--yellow");
                    }

                    else if (percent >= orange) {
                        $bar.addClass("progress__bar--orange");
                    }

                    speed = Math.floor(Math.random() * 900);
                    update();

                }

                $bar.css({ width: percent + "%" });

            }, speed);

        };

        setTimeout(function () {

            $progress.addClass("progress--active");
            update();

        }, 1000);


        $(document).on("click", function (e) {

            percent = 0;
            clearTimeout(timer);
            resetColors();
            update();

        }); //@ sourceURL=pen.js