Js运动动画系列2--透明度动画

紫菜中毒

于 2016-07-11 10:40:08 发布

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分类专栏： JavaScript Js动画文章标签：动画博客前端 javascript

本文链接：https://blog.youkuaiyun.com/u014492334/article/details/51878941

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<head>
    <title>透明度动画</title>
    <style type="text/css">
        *
        {
            margin: 0;
            padding: 0;
        }
        #div1
        {
            width: 200px;
            height: 200px;
            background: red;
            filter:alpha(opacity:30);
            opacity:0.3;
            cursor: pointer;
        }
    </style> 
</head>
<body>
    <div id="div1">
    </div>
</body>
</html>

<script type="text/javascript">
        window.onload = function () {
            var oDiv = document.getElementById('div1');
            oDiv.onmousemove = function () {
                startChange(100);
            }
            oDiv.onmouseout = function () {
                startChange(30);
            }
        }
        var timer = null;
        var alpha=30;
        function startChange(iTarget) {
            var oDiv = document.getElementById('div1');
            clearInterval(timer);
            timer = setInterval(function () {
                var speed = 0;
                if (alpha > iTarget) {
                    speed = -10;
                } else {
                    speed = 10;
                }
                if (alpha == iTarget) {
                    clearInterval(timer);
                } else {
                    alpha += speed
                    oDiv.style.filter='alpha(opacity:'+alpha+')';
                    oDiv.style.opacity=alpha/100;
                }
            }, 30);
        }
    </script>