【前端CSS3】CSS3實現進度條

1、使用keyframes實現

// html結構
<div class="progress">
	<div class="progress-bar">
		<div class="animate-bar"></div>
	</div>
</div>

// CSS部分
.progress {
	position: relative;
	width: auto;
	height: 8px;
	margin: 0 auto;
  	border-radius: 8px;
  	background-color: #ccc;
}
.progress .progress-bar {
	position: absolute;
	left: 0;
	top: 0;
	width: 20%;
	height: 8px;
	border-radius: 8px;
	background-color: #2d8cf0;
}
.progress .progress-bar .animate-bar {
	position: absolute;
	left: 0;
	top: 0;
	width: 0%;
	height: 8px;
	border-radius: 8px;
	opacity: 0;
	background-color: #fff;
	-webkit-animation: progress-active 2s ease-in-out infinite;
	animation: progress-active 2s ease-in-out infinite；
}
@-webkit-keyframes progress-active {
	0% {
		opacity: .3;
		width: 0;
	}
	to {
		opacity: 0;
		width: 100%;
	}
}
@keyframes progress-active {
	0% {
		opacity: .3;
		width: 0;
	}
	to {
		opacity: 0;
		width: 100%;
	}
 }

效果圖如下：[這是一個動態的進度條]

2、靜態背景漸變滾動條

// html結構
<div class="progress">
	<div class="progress-bar">
		<div class="progress-value">80%</div>
	</div>
</div>

// CSS部分
.progress {
	position: relative;
	width: 200px;
	height: 20px;
	background: #262626;
	border-radius: 20px;
}
.progress-bar {
	position: absolute;
	left: 0;
	top: 0;
	width: 80%;
	height: 20px;
	line-height: 20px;
	border-radius: 20px;
	background: linear-gradient(to right, #da81a1 35%, #7aa4c8 68%);
	font-size: 12px;
	color: #fff;
	text-align: center;
	-webkit-transition: 80% .6s ease;
	-o-transition: 80% .6s ease;
	transition: 80% .6s ease;
	animation: animate-positive 2s;
}

@-webkit-keyframes animate-positive{
	0% { width: 0%; }
}
@keyframes animate-positive{
	0% { width: 0%; }
}

效果圖如下：