登录button添加loading属性,校验失败属性变为false

src/views/user/Login.vue

@@ -303,7 +303,6 @@
       },
       loginSuccess() {
         this.loginBtn = false
-        this.loading = false
         this.$router.push({ name: 'dashboard' })
         this.$notification.success({
           message: '欢迎',