vue 获取按钮权限

  import Vue from 'vue';
import store from '@/store';
// 权限检查方法
let hasPermission = Vue.prototype.$has = function(value) {
  if (value in store.getters.roles) {
    return true;
  }
  return false;
};

function remove(selectors) {
  if (selectors.removeNode && selectors.removeNode.length) return;
  selectors.removeNode = [];
  if (selectors.length != undefined) {
    var len = selectors.length;
    for (var i = 0; i < len; i++) {
      selectors.removeNode.push({
        parent: selectors[i].parentNode,
        inner: selectors[i].outerHTML,
        next: selectors[i].nextSibling,
        node: selectors[i]
      });
    }
    for (var i = 0; i < len; i++)
      selectors[0].parentNode.removeChild(selectors[0]);
  } else {
    selectors.removeNode.push({
      parent: selectors.parentNode,
      inner: selectors.outerHTML,
      next: selectors.nextSibling,
      node: selectors
    });
    selectors.parentNode.removeChild(selectors);
  }
}

function getNodeNext(node) {
  if (node) {
    //如果是普通节点
    if (!node.removeNode || !node.removeNode[0]) return node;
    //如果next是普通节点
    if (node.removeNode[0].next && !node.removeNode[0].next.removeNode) return node.removeNode[0].next
    //如果不是处理后的节点(未生成)
    if (node.removeNode[0].next.removeNode.length != 0) return getNodeNext(node.removeNode[0].next)
  }
  return null;
}

function recover(selectors) {
  var len = selectors.removeNode.length;
  for (var i = 0; i < len; i++) {
    var node = selectors.removeNode[i];
    if (node.next == null) {
      node.parent.appendChild(node.node);
    } else {
      node.parent.insertBefore(node.node, getNodeNext(node.next));
    }
  }
  selectors.removeNode = [];
}

export default {
  update(el, binding, vnode, ovnode) {
    // 获取按钮权限
    if (!hasPermission(binding.value)) {
      remove(el);
    } else {
      recover(el);
    }
  }
};