Vue 權限控制 使用自定義指令 代替v-if

參考了vue-element-admin 指令庫的permission

使用Demo(demo.vue)

<template>
  <p>admin組:<span v-permission="['admin']">可看見v-permission="['admin']"</span></p>
  
  <p>editor:<span v-permission="['editor']">可看見v-permission="['editor']"</span></p>
  
  <p>admin editor組:<span v-permission="['admin','editor']">可看見v-permission="['admin','editor']"</span></p>
  
  <p>another組:<span v-permission="['another']">可看見v-permission="['another']"</span></p>
</template>

v-permission指令代碼 注冊到全局(main.js)

const permission={
    inserted(el, binding, vnode) {
        const { value } = binding
        const roles = ['editor','admin']
        if (value && value instanceof Array && value.length > 0) {
            const permissionRoles = value
            const hasPermission = roles.some(role => {
                return permissionRoles.includes(role)
            })
            if (!hasPermission) {
                el.parentNode && el.parentNode.removeChild(el)
            }
        } else {
            throw new Error(`need roles! Like v-permission="['admin','editor']"`)
        }
    }
}

Vue.directive('permission', permission)

對比

-  v-show (v-show的dom不隱藏，改變display用戶可以看到不該看的信息)

- v-if (v-if刪除節點遺留<!-- -->的注釋)

易維護，明了