javascript中級--運動二

時間 2019-11-19

原文原文鏈接

1、設置圖片透明度變化html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #img1 {
            filter: alpha(opacity=30);
            opacity: 0.3;
        }
    </style>
    <script>
        window.onload = function() {
            var oImg = document.getElementById('img1');
            oImg.onmouseover = function() {
                startMove(100);
            }

            oImg.onmouseout = function() {
                startMove(30);
            }

        }
        var timer = null;
        var alpha = 30;

        function startMove(iTarget) {
            var oImg = document.getElementById('img1');
            clearInterval(timer);
            timer = setInterval(function() {
                var iSpeed = -1;
                if (alpha < iTarget) {
                    iSpeed = -iSpeed;
                }
                if (alpha == iTarget) {
                    clearInterval(timer);
                } else {
                    alpha += iSpeed;
                    //document.title = alpha;
                    oImg.style.filter = 'alpha(opacity=' + alpha + ')';
                    oImg.style.opacity = alpha / 100;
                }
            }, 30)
        }
    </script>
</head>

<body>
    <img id="img1" src="p1.jpg" alt="" width="300px">
</body>

</html>

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