js progress bar control implementation

First define a div with a span embedded in it:

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

Then use css to complete the style of the progress bar:

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 ;  
               
        }

Finally, use js to control the progress bar display:

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();

The effect is as follows:

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