js自定义右键菜单

js自定义右键菜单

要把一些小东西记录下来，

---

function Mmenu(nodeId, list) {
    this.window = window;
    if (!nodeId || !list) {
        throw '参数不全'
    }
    this.list = list;
    this.nodeId = nodeId;
    this.node = document.getElementById(nodeId);
    if (!this.node) {
        throw `${nodeId}该节点不存在`
    }
    Mmenu.blackTheme(this.node.style)
    for (let item in list) {
        Mmenu.childNode(item, list, this.node);
    }
    // 创建样式表
    let _style = document.createElement("style");
    document.head.appendChild(_style);
    let sheet = _style.sheet;
    sheet.addRule('.menu-li:hover', 'background-color: #99cc66');
    sheet.addRule('.menu-li', 'padding: 10px 10px 10px 20px;');
};
Mmenu.prototype.init = function() {
    Mmenu.blackTheme(this.node.style)
    this.window.oncontextmenu = (e) => {
        e.preventDefault();
        let style = this.node.style;
        style.display = 'block';
        style.left = e.clientX + 'px';
        style.top = e.clientY + 'px';
    }
    this.window.onclick = (e) => {
        this.node.style.display = 'none'
    }
};
Mmenu.blackTheme = (style) => {
    style.backgroundColor = '#333333';
    style.color = '#ffffff';
    style.width = '110px';
    style.height = '132px';
    style.paddingTop = '5px';
    style.cursor = 'pointer';
    style.borderRadius = '6px';

};
Mmenu.childNode = (item, list, node) => {
    let li = document.createElement('li');
    li.style.listStyle = 'none';
    li.innerHTML = item;
    li.onclick = list[item];
    li.setAttribute('class', 'menu-li')
    node.appendChild(li)
}

方法调用

let menu = new Mmenu('menu', {
    '删除': _delete,
    '打开': _open,
    '下载': _download
});
menu.init()

function _delete() {
    alert('delete')
};

function _open() {
    alert('open');
};

function _download() {
    alert('download');
};

效果显示