newline-after-var
变量声明后需要或不允许空行（newline-after-var）
在--fix命令行上的选项可以自动修复一些被这条规则反映的问题。
此规则在ESLint v4.0.0 中已弃用，并由填充行间语句规则取代。
从今天起，在将变量声明与其他代码分离时没有一致性。有些开发人员在var语句和其他代码之间留下了一条空行，如下所示：
var foo;
// do something with foo
而其他人根本没有留下任何空白的换行符。
var foo;
// do something with foo
问题在于这些开发人员在一个项目中一起工作。此规则强制执行，其中空换行符允许或禁止后一种编码风格var，let或const语句。它有助于代码在整个项目中保持一致。
规则细节
此规则强制执行，其中空线都需要或禁止后一种编码风格var，let或const语句来实现整个项目一致的编码风格。
选项
这条规则有一个字符串选项：
"always"（默认）需要后一个空行var，let或const在一条线上评论之后直接变种语句被当作附加的变种语句。
"never"不允许空行之后var，let或const
always
此规则的默认代码错误代码示例"always"：
/*eslint newline-after-var: ["error", "always"]*/
/*eslint-env es6*/
var greet = "hello,",
name = "world";
console.log(greet, name
let greet = "hello,",
name = "world";
console.log(greet, name
var greet = "hello,";
const NAME = "world";
console.log(greet, NAME
var greet = "hello,";
var name = "world";
// var name = require("world"
console.log(greet, name
具有默认选项的此规则的正确代码示例"always"：
/*eslint newline-after-var: ["error", "always"]*/
/*eslint-env es6*/
var greet = "hello,",
name = "world";
console.log(greet, name
let greet = "hello,",
name = "world";
console.log(greet, name
var greet = "hello,";
const NAME = "world";
console.log(greet, NAME
var greet = "hello,";
var name = "world";
// var name = require("world"
console.log(greet, name
never
此规则的错误代码示例包含以下"never"选项：
/*eslint newline-after-var: ["error", "never"]*/
/*eslint-env es6*/
var greet = "hello,",
name = "world";
console.log(greet, name
let greet = "hello,",
name = "world";
console.log(greet, name
var greet = "hello,";
const NAME = "world";
console.log(greet, NAME
var greet = "hello,";
var name = "world";
// var name = require("world"
console.log(greet, name
此规则的正确代码示例包含以下"never"选项：
/*eslint newline-after-var: ["error", "never"]*/
/*eslint-env es6*/
var greet = "hello,",
name = "world";
console.log(greet, name
let greet = "hello,",
name = "world";
console.log(greet, name
var greet = "hello,";
const NAME = "world";
console.log(greet, NAME
var greet = "hello,";
var name = "world";
// var name = require("world"
console.log(greet, name
版本
此规则在ESLint 0.18.0中引入。
