js+css3实现的百分比进度条（源码分享）

body {
        background-color: #f5f7f9;
        color: #6c6c6c;
        font: 300 1em/1.5em;
    }

    .container {
        left: 50%;
        position: absolute;
        top: 40%;
        transform: translate(-50%, -50%);
        -webkit-transform: translate(-50%, -50%);
    }
    /* PROGRESS */

    .progress {
        background-color: #e5e9eb;
        height: 0.25em;
        position: relative;
        width: 24em;
    }

    #progress-bar {
        animation-duration: 3s;
        animation-name: width;
        background-image: linear-gradient(to right, #4cd964, #5ac8fa, #007aff, #34aadc, #5856d6, #ff2d55);
        background-image: -webkit-linear-gradient(to right, #4cd964, #5ac8fa, #007aff, #34aadc, #5856d6, #ff2d55);
        background-size: 24em 0.25em;
        height: 100%;
        position: relative;
    }

    @key s width {
        0%,
        100% {
            transition-timing-function: cubic-bezier(1, 0, 0.65, 0.85);
        }
        0% {
            width: 0;
        }
        100% {
            width: 100%;
        }
    }

    .container .notice {
        animation: change 5s linear 0s infinite;
        font-size: 15px;
        margin: 10px;
    }

    @key s change {
        0% {
            color: #4cd964;
        }
        25% {
            color: #5ac8fa;
        }
        50% {
            color: #007aff;
        }
        75% {
            color: #5856d6;
        }
        100% {
            color: #ff2d55;
        }
    }

<div class="container">
        <div class="notice"id="notice">
            奴家,正在~客官不要急啦~(づ￣ 3￣)づ
        </div>
        <div class="progress">
            <div id="progress-bar">
            </div>
        </div>
  </div>

  window.  = function() {
            var progressBar = {
                //初始化
                init: function() {
                    var oBar = document.getElementById('progress-bar');
                    var oNotice = document.getElementById('notice');
                    var count = 0;
                    //百分比计算,根据css的来
                    var timer = setInterval(function() {
                        count++;
                        oBar.innerHTML = count + '%';
                        if (count === 100) {
                            oNotice.innerHTML = '客官,奴家好了~(✿◡‿◡)'
                            clearInterval(timer);
                        }
                    }, 30);
                }
            };
            progressBar.init();
        }