lovecoding
/
Web1020


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .progress-border{
            width: 600px;
            height: 100px;
            border:4px solid black;
            border-radius: 10px;
            position: relative;
            overflow: hidden;

        }
        .progress-bar{
            width: 0;
            height: 100px;
            background-color: blue;
            position: absolute;
            top: 0;
            left: 0;
        }
        .progress-border .progress-num{
            position: absolute;
            top: 0;
            left: 50px;
            z-index: 1;
            font-size: 40px;
            font-weight: bolder;
            height: 100px;
            line-height: 100px;
        }
    </style>
</head>
<body>
    <div class="progress-content">
        <div class="progress-border">
            <div class="progress-num">0%</div>
            <div class="progress-bar"></div>
        </div>
        <button id="btn">start</button>
    </div>
    <script>
        var oNum = document.getElementsByClassName("progress-num")[0];
        var oBar = document.getElementsByClassName("progress-bar")[0];
        var oBtn = document.getElementById("btn");
        var i = 0;
        var timer = null;
        oBtn.onclick = function(){
            // oBar.style.width = "10px";
            timer = setInterval(function(){
                // if(oBar.offsetWidth >= 600){

                // }
                if(i >= 100){
                    clearInterval(timer);
                }else{
                    oBar.style.width = oBar.offsetWidth + 6 + "px";
                    oNum.innerText = ++i + "%";
                }
            },16);
        }
    </script>
</body>
</html>