<li
    v-for="item in resourceList"
    :key="item.id"
    @click="handleClickFolder(item)"
    @contextmenu.prevent="openMenu($event,item)"
   >
   ...
   </li>

<ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu">
  <!-- <li v-if="rightClickItem.fileType==99" @click="handleClickFolder(rightClickItem)">打开</li>
  <li @click="handleDelete(rightClickItem)">删除</li>
  <li @click="handleDownloadFile(rightClickItem)" v-if="rightClickItem.fileType!=99">下载</li>
  <li @click="handlePreviewFile(rightClickItem)" v-if="rightClickItem.fileType!=99">预览</li>
  <li @click="handleUpdate(rightClickItem)">编辑</li> -->
  <li>内容</li>
 </ul>

data() { 
	return {
			visible: false,
			top: 0,
			left: 0
	}
}

 watch: {
 visible(value) {
  if (value) {
  document.body.addEventListener('click', this.closeMenu)
  } else {
  document.body.removeEventListener('click', this.closeMenu)
  }
 }
 }

 openMenu(e, item) {
  this.rightClickItem = item;

  var x = e.pageX;
  var y = e.pageY;

  this.top = y;
  this.left = x;
  
  this.visible = true;
 },
 closeMenu() {
  this.visible = false;
 }

.contextmenu {
 margin: 0;
 background: #fff;
 z-index: 3000;
 position: absolute;
 list-style-type: none;
 padding: 5px 0;
 border-radius: 4px;
 font-size: 12px;
 font-weight: 400;
 color: #333;
 box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
}

.contextmenu li {
 margin: 0;
 padding: 7px 16px;
 cursor: pointer;
}

.contextmenu li:hover {
 background: #eee;
}

npm install vue-contextmenu --save

import VueContextMenu from 'vue-contextmenu'
Vue.use(VueContextMenu)

<template>
<div id="app" @contextmenu="showMenu"
 style="width: 100px;height: 100px;margin-top: 20px;background: red;">
 <vue-context-menu :contextMenuData="contextMenuData"
  @savedata="savedata"
  @newdata="newdata"></vue-context-menu>
</div>
</template>
<script>
export default {
 name: 'app',
 data () {
 return {
  	// contextmenu data (菜单数据)
  contextMenuData: {
  // the contextmenu name(@1.4.1 updated)
  menuName: 'demo',
  // The coordinates of the display(菜单显示的位置)
  axis: {
   x: null,
   y: null
  },
  // Menu options (菜单选项)
  menulists: [{
   fnHandler: 'savedata', // Binding events(绑定事件)
   icoName: 'fa fa-home fa-fw', // icon (icon图标 )
   btnName: 'Save' // The name of the menu option (菜单名称)
  }, {
   fnHandler: 'newdata',
   icoName: 'fa fa-home fa-fw',
   btnName: 'New'
  }]
  }
 }
 },
 methods: {
 showMenu () {
  event.preventDefault()
  var x = event.clientX
  var y = event.clientY
  // Get the current location
  this.contextMenuData.axis = {
  x, y
  }
 },
 savedata () {
  alert(1)
 },
 newdata () {
  console.log('newdata!')
 }
 }
}
</script>