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原生js实现简洁的下拉菜单

截图：


在线预览：
https://jsrun.net/3cdKp/embedded/all/light


使用示例：

var clicked = function(e) {
    console.log("clicked", e.target.dataset.value)
}
new MyDropdown({
    el: ".my-dropdown-btn",
    maxWidth: '200px',
    maxHeight: '400px',
    //支持click mouseenter dblclick等，默认click
    toggleEvent: 'mouseenter',
    items: [
        {
            name: 'Home',
            value: 'home',
            icon: '',
            fn: clicked
        },
        {
            name: 'About',
            value: 'about',
            icon: '',
            selected: false,
            fn: clicked
        },
        {
            name: 'Contact',
            value: 'contact',
            icon: '',
            fn: clicked,
            //icon也支持对象传值，同样具有html和fn属性
            op: {
                html: `×`,
                fn: function(e) {
                    console.log('op clicked');
                }
            }
        }
    ],
    created: function(menu) {
        console.log('After created callback');
    },
    shown: function(menu) {
        console.log('After shown callback');
    },
    hidden: function(menu) {
        console.log('After hidden callback');
    }
});