首先定義一個div內嵌一個span:

<div id="loadbar">
			  <span id="bar"  style="width: 10%;">10%</span>
		</div>

然後使用css完成進度條的樣式：

	div#loadbar{
				width:300px;
				background-color: silver;
				border:1px solid salmon;
				text-align: center;
				border-radius:8px ;
			}
			#bar{
				display: block;
				font-family: arial;
				font-size: 12px;
				background-color: sandybrown;
				text-align: center;
				padding: 5px;
				border-radius:5px ;
				 
			}
 

		var i=0; 
			function startbar(){
				var showbar=setInterval("setbar()",1000);
			}
			function setbar(){
				console.log("setbar");
				i+=5;
				if(i>=100)
				{ 
					clearInterval(showbar);
			    }
				document.getElementById("bar").style.width=i+"%";
				document.getElementById("bar").innerHTML=i+"%";
			}
			
			startbar();