酷炫的progressbar(上限可大于100%)

<link rel="stylesheet" type="text/css" href="./index.css">
<div id="progress"></div>
<script type="text/javascript" src="./index.js"></script>
<script type="text/javascript">
	var cp1 = new ColorProgress('progress', 'danger', 84)
</script>

/**
 * Created by lonelydawn on 2017-11-20.
 * ColorProgress - Pretty easy progressar
 * @params
 * el: String
 * type: enum['exceed', 'success', 'warning', 'danger']
 * percentage: Integer
 * max: Integer
 * height: Integer
 * 
 * @methods
 * setPercentage(percentage: Integer)
 * setType(type: enum['exceed', 'success', 'warning', 'danger'])
 */

var ColorProgress = function (el, type, percentage, max, height) {
	var types = ['exceed', 'success', 'warning', 'danger']
	type = types.indexOf(type) > -1 ? type : types[0]
	max = (max && max >= 100) ? max : 100
	percentage = (percentage && percentage <= max) ? percentage : 0
	height = height || 12

	var setPercentage = function (percentage) {
		inner.style.width = percentage * 100 / max + '%'
		label.innerHTML = percentage + '%'
		label.className = 'progress-label' + (percentage === 0 ? ' is-danger' : '')
	}
	var setType = function (type) {
		inner.className = 'progress-inner ' + {
			exceed: 'status-exceed',
			success: 'status-success',
			warning: 'status-warning',
			danger: 'status-danger'
		}[type]
	}

	var wrapper = document.getElementById(el)
	if (wrapper) {
		// 清空容器
		var childs = wrapper.childNodes
		for(var i = childs.length - 1; i >= 0; i--) {
		  wrapper.removeChild(childs[i]); 
		}
		// 添加节点并设置样式
		var track = document.createElement('div')
		track.className = 'progress-track'
		track.style.height = height + 'px'
		var inner = document.createElement('div')
		var label = document.createElement('div')
		var bg = document.createElement('div')
		bg.className = 'progress-bg'
		bg.style.width = 10000 / max + '%'
		setPercentage(percentage)
		setType(type)

		track.appendChild(inner)
		track.appendChild(label)
		track.appendChild(bg)
		wrapper.appendChild(track)
	}

	return {
		setPercentage: setPercentage,
		setType: setType
	}
} 

.progress-track {
  width: 100%;
  position: relative;
}
.progress-bg {
  top: 0;
  left: 0;
  height: 100%;
  z-index: 1049;
  position: absolute;
  background-color: #ebeef5;
  border-top-right-radius: 100px;
  border-bottom-right-radius: 100px;
}
.progress-inner {
  height: 100%;
  display: inline-block;
  vertical-align: top;
  position: relative;
  z-index: 1050;
  border-top-right-radius: 100px;
  border-bottom-right-radius: 100px;
  -webkit-transition: all 500ms;
  -moz-transition: all 500ms;
  -ms-transition: all 500ms;
  -o-transition: all 500ms;
  transition: all 500ms;
}
.progress-label {
  height: 100%;
  line-height: 100%;
  position: relative;
  z-index: 1050;
  display: inline-block;
  vertical-align: top;
  font-size: 12px;
}
.status-exceed {
  background: rgb(252,248,177); /* Old browsers */
  background: -moz-linear-gradient(top, rgba(252,248,177,1) 0%, rgba(229,218,95,1) 100%); /* FF3.6-15 */
  background: -webkit-linear-gradient(top, rgba(252,248,177,1) 0%,rgba(229,218,95,1) 100%); /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(to bottom, rgba(252,248,177,1) 0%,rgba(229,218,95,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#fcf8b1', endColorstr='#e5da5f',GradientType=0 ); /* IE6-9 */
}
.status-success {
  background: rgb(215,238,233); /* Old browsers */
  background: -moz-linear-gradient(top, rgba(215,238,233,1) 0%, rgba(111,192,172,1) 100%); /* FF3.6-15 */
  background: -webkit-linear-gradient(top, rgba(215,238,233,1) 0%,rgba(111,192,172,1) 100%); /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(to bottom, rgba(215,238,233,1) 0%,rgba(111,192,172,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#d7eee9', endColorstr='#6fc0ac',GradientType=0 ); /* IE6-9 */
}
.status-warning {
  background: rgb(248,201,153); /* Old browsers */
  background: -moz-linear-gradient(top, rgba(248,201,153,1) 0%, rgba(222,142,82,1) 100%); /* FF3.6-15 */
  background: -webkit-linear-gradient(top, rgba(248,201,153,1) 0%,rgba(222,142,82,1) 100%); /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(to bottom, rgba(248,201,153,1) 0%,rgba(222,142,82,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f8c999', endColorstr='#de8e52',GradientType=0 ); /* IE6-9 */
}
.status-danger {
  background: rgb(250,161,154); /* Old browsers */
  background: -moz-linear-gradient(top, rgba(250,161,154,1) 0%, rgba(202,68,61,1) 100%); /* FF3.6-15 */
  background: -webkit-linear-gradient(top, rgba(250,161,154,1) 0%,rgba(202,68,61,1) 100%); /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(to bottom, rgba(250,161,154,1) 0%,rgba(202,68,61,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#faa19a', endColorstr='#ca443d',GradientType=0 ); /* IE6-9 */
}
.is-danger {
  color: #f00;
}