transition 
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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>transition</title>

    <script type="text/javascript">
        window.onload = function () {
            var box = document.getElementById("box");
            //监听事件
            box.addEventListener("mouseover", function () {
                this.style.opacity = 1;
                this.style.height = '50px';
                this.style.width = '300px';
                this.style.backgroundColor = 'blue';//改变的变量值需要加'引号
                this.style.borderRadius = '5px';
                this.style.boxShadow = '2px 2px 6px blue';
            })
            box.addEventListener("mouseout", function () {
                this.style.opacity = 0.5;
                this.style.height = '150px';
                this.style.width = '150px';
                //js对应的属性中由'-'的，去掉'-',变为'-'的首字母大写
                this.style.backgroundColor = "blue";
                this.style.borderRadius = "50%";
                this.style.boxShadow = '0px 0px 0px ';

            })


            var circle = document.getElementById("circle")
            circle.addEventListener("mouseover", function () {
                this.style.borderRadius = "0";
                this.style.backgroundColor = "#c847c8"
            })
            circle.addEventListener("mouseout", function () {
                this.style.borderRadius = "50%";
                this.style.backgroundColor = "purple"
            })
        }

    </script>
    <style type="text/css">
        .box {
            height: 150px;
            width: 150px;
            background-color: red;
            opacity: 0.5;
            transition: opacity 1s, height 1s, width 1.8s, background-color 1s,
                border-radius 1s, box-shadow 2s;
            display: inline-block;
        }

        .circle {
            height: 150px;
            width: 150px;
            border-radius: 50%;
            background-color: purple;
            display: inline-block;
            opacity: 0.6;
            transition: background-color 1s, border-radius 1.5s;
        }
    </style>
</head>

<body>
    <div class="box" id="box"></div>
    <div class="circle" id="circle"></div>

</body>

</html>

更新于：2020年10月20日

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