js设计模式之策略模式

js设计模式之策略模式

<!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>
        * {
            margin: 0;
            padding: 0;
        }

        .wrap {
            width: 300px;
            height: 80px;
            display: flex;
            justify-content: center;
            margin: 100px auto;
        }

        .wrap div {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            margin: 0 10px;
            border: 1px #ccc solid;
            text-align: center;
            line-height: 80px;
        }

        .wrap .active {
            background-color: red;
        }
    </style>
</head>

<body>
    <div class="wrap">
        <div></div>
        <div></div>
        <div></div>
    </div>
    <script>
        class Active {
            constructor(selector, tactics) {
                this.nodes = [...document.querySelectorAll(selector)];
                this.tactics = tactics;
                this.bindEvent();
            }
            bindEvent() {
                this.nodes.forEach((item) => {
                    var that = this
                    item.onclick = function () {
                        that.tactics.handle(this, that.nodes)
                    }
                })
            }
        }
        class Tactics1 {//策略一,点击元素变红
            handle(ele, nodes) {
                ele.classList.toggle('active')
            }
        }
        class Tactics2 {//策略二,点击元素变红,最多选中2个标签
            handle(ele, nodes) {
                let res = nodes.filter((item) => item.classList.contains('active'))
                if(res.length === 2 && !ele.classList.contains('active'))
                return
                ele.classList.toggle('active')
            }
        }
        class Tactics3 {//策略二,点击元素变红,最多选中2个标签,点击第三个随机取消之前的一个
            handle(ele, nodes) {
                ele.classList.toggle('active')
                if(nodes.every(item=>item.classList.contains('active'))){
                    nodes.filter(item=>item!==ele)[Math.floor(Math.random()*2)].classList.toggle('active')
                }
            }
        }
        new Active('.wrap div', new Tactics2())
    </script>
</body>

</html>

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