comma-style

强制使用一致的逗号样式

一些该规则报告的问题可以通过 --fix 命令行选项 自动修复

逗号样式规则强制使用逗号分隔列表的样式。JavaScript 中主要使用两种逗号样式：

• 标准样式，其中逗号放在当前行的末尾
• 逗号优先样式，其中逗号放在下一行的开头

使用 Comma First 样式的理由之一是它可以帮助跟踪缺少和尾随的逗号。这些都是有问题的，因为变量声明中缺少逗号会导致全局变量泄漏，而尾随逗号会导致旧版本 IE 中的错误。

规则详情

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选项

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last

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/*eslint comma-style: ["error", "last"]*/

var foo = 1
,
bar = 2;

var foo = 1
  , bar = 2;

var foo = ["apples"
           , "oranges"];

function bar() {
    return {
        "a": 1
        ,"b:": 2
    };
}

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/*eslint comma-style: ["error", "last"]*/

var foo = 1, bar = 2;

var foo = 1,
    bar = 2;

var foo = ["apples",
           "oranges"];

function bar() {
    return {
        "a": 1,
        "b:": 2
    };
}

first

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/*eslint comma-style: ["error", "first"]*/

var foo = 1,
    bar = 2;

var foo = ["apples",
           "oranges"];

function bar() {
    return {
        "a": 1,
        "b:": 2
    };
}

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/*eslint comma-style: ["error", "first"]*/

var foo = 1, bar = 2;

var foo = 1
    ,bar = 2;

var foo = ["apples"
          ,"oranges"];

function bar() {
    return {
        "a": 1
        ,"b:": 2
    };
}

exceptions

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/*eslint comma-style: ["error", "first", { "exceptions": { "ArrayExpression": true, "ObjectExpression": true } }]*/

var o = {},
    a = [];

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/*eslint comma-style: ["error", "first", { "exceptions": { "ArrayExpression": true, "ObjectExpression": true } }]*/

var o = {fst:1,
         snd: [1,
               2]}
  , a = [];

何时不使用

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