enforce consistent indentation (indent)

强制使用一致的缩进 (indent)

The --fix option on the command line can automatically fix some of the problems reported by this rule.

命令行中的 --fix 选项可以自动修复一些该规则报告的问题。

There are several common guidelines which require specific indentation of nested blocks and statements, like:

一些常见的准则要求嵌套的块和语句使用特定的缩进，比如：

function hello(indentSize, type) {
    if (indentSize === 4 && type !== 'tab') {
        console.log('Each next indentation will increase on 4 spaces');
    }
}

These are the most common scenarios recommended in different style guides:

这是最常见的情况，也是不同的风格指南中都推荐的：

Rule Details

This rule enforces a consistent indentation style. The default style is 4 spaces.

该规则旨在强制使用一致的缩进风格。默认是 4个空格。

Options

This rule has a mixed option:

该规则有一个混合选项：

For example, for 2-space indentation:

例如，2 个空格缩进：

{
    "indent": ["error", 2]
}

Or for tabbed indentation:

或 tab 缩进：

{
    "indent": ["error", "tab"]
}

Examples of incorrect code for this rule with the default options:

默认选项的 错误 代码示例：

/*eslint indent: "error"*/

if (a) {
  b=c;
  function foo(d) {
    e=f;
  }
}

Examples of correct code for this rule with the default options:

默认选项的 正确 代码示例：

/*eslint indent: "error"*/

if (a) {
    b=c;
    function foo(d) {
        e=f;
    }
}

This rule has an object option:

该规则有一个对象选项：

Level of indentation denotes the multiple of the indent specified. Example:

缩进级别表示指定的多个缩进。例如：

tab

Examples of incorrect code for this rule with the "tab" option:

选项 "tab" 的 错误 代码示例：

/*eslint indent: ["error", "tab"]*/

if (a) {
     b=c;
function foo(d) {
           e=f;
 }
}

Examples of correct code for this rule with the "tab" option:

选项 "tab" 的 正确 代码示例：

/*eslint indent: ["error", "tab"]*/

if (a) {
/*tab*/b=c;
/*tab*/function foo(d) {
/*tab*//*tab*/e=f;
/*tab*/}
}

SwitchCase

Examples of incorrect code for this rule with the 2, { "SwitchCase": 1 } options:

选项 2, { "SwitchCase": 1 } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "SwitchCase": 1 }]*/

switch(a){
case "a":
    break;
case "b":
    break;
}

Examples of correct code for this rule with the 2, { "SwitchCase": 1 } option:

选项 2, { "SwitchCase": 1 } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "SwitchCase": 1 }]*/

switch(a){
  case "a":
    break;
  case "b":
    break;
}

VariableDeclarator

Examples of incorrect code for this rule with the 2, { "VariableDeclarator": 1 } options:

选项 2, { "VariableDeclarator": 1 } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "VariableDeclarator": 1 }]*/
/*eslint-env es6*/

var a,
    b,
    c;
let a,
    b,
    c;
const a = 1,
    b = 2,
    c = 3;

Examples of correct code for this rule with the 2, { "VariableDeclarator": 1 } options:

选项 2, { "VariableDeclarator": 1 } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "VariableDeclarator": 1 }]*/
/*eslint-env es6*/

var a,
  b,
  c;
let a,
  b,
  c;
const a = 1,
  b = 2,
  c = 3;

Examples of correct code for this rule with the 2, { "VariableDeclarator": 2 } options:

选项 2, { "VariableDeclarator": 2 } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "VariableDeclarator": 2 }]*/
/*eslint-env es6*/

var a,
    b,
    c;
let a,
    b,
    c;
const a = 1,
    b = 2,
    c = 3;

Examples of incorrect code for this rule with the 2, { "VariableDeclarator": "first" } options:

选项 2, { "VariableDeclarator": "first" } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "VariableDeclarator": "first" }]*/
/*eslint-env es6*/

var a,
  b,
  c;
let a,
  b,
  c;
const a = 1,
  b = 2,
  c = 3;

Examples of correct code for this rule with the 2, { "VariableDeclarator": "first" } options:

选项 2, { "VariableDeclarator": "first" } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "VariableDeclarator": "first" }]*/
/*eslint-env es6*/

var a,
    b,
    c;
let a,
    b,
    c;
const a = 1,
      b = 2,
      c = 3;

Examples of correct code for this rule with the 2, { "VariableDeclarator": { "var": 2, "let": 2, "const": 3 } } options:

选项 2, { "VariableDeclarator": { "var": 2, "let": 2, "const": 3 } } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "VariableDeclarator": { "var": 2, "let": 2, "const": 3 } }]*/
/*eslint-env es6*/

var a,
    b,
    c;
let a,
    b,
    c;
const a = 1,
      b = 2,
      c = 3;

outerIIFEBody

Examples of incorrect code for this rule with the options 2, { "outerIIFEBody": 0 }:

选项 2, { "outerIIFEBody": 0 } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "outerIIFEBody": 0 }]*/

(function() {

  function foo(x) {
    return x + 1;
  }

})();


if(y) {
console.log('foo');
}

Examples of correct code for this rule with the options 2, {"outerIIFEBody": 0}:

选项 2, {"outerIIFEBody": 0} 的 正确 代码示例：

/*eslint indent: ["error", 2, { "outerIIFEBody": 0 }]*/

(function() {

function foo(x) {
  return x + 1;
}

})();


if(y) {
   console.log('foo');
}

MemberExpression

Examples of incorrect code for this rule with the 2, { "MemberExpression": 1 } options:

选项 2, { "MemberExpression": 1 } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "MemberExpression": 1 }]*/

foo
.bar
.baz()

Examples of correct code for this rule with the 2, { "MemberExpression": 1 } option:

选项 2, { "MemberExpression": 1 } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "MemberExpression": 1 }]*/

foo
  .bar
  .baz();

// Any indentation is permitted in variable declarations and assignments.
var bip = aardvark.badger
                  .coyote;

FunctionDeclaration

Examples of incorrect code for this rule with the 2, { "FunctionDeclaration": {"body": 1, "parameters": 2} } option:

选项 2, { "FunctionDeclaration": {"body": 1, "parameters": 2} } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "FunctionDeclaration": {"body": 1, "parameters": 2} }]*/

function foo(bar,
  baz,
  qux) {
    qux();
}

Examples of correct code for this rule with the 2, { "FunctionDeclaration": {"body": 1, "parameters": 2} } option:

选项 2, { "FunctionDeclaration": {"body": 1, "parameters": 2} } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "FunctionDeclaration": {"body": 1, "parameters": 2} }]*/

function foo(bar,
    baz,
    qux) {
  qux();
}

Examples of incorrect code for this rule with the 2, { "FunctionDeclaration": {"parameters": "first"} } option:

选项 2, { "FunctionDeclaration": {"parameters": "first"} } 的 错误 代码示例：

/*eslint indent: ["error", 2, {"FunctionDeclaration": {"parameters": "first"}}]*/

function foo(bar, baz,
  qux, boop) {
  qux();
}

Examples of correct code for this rule with the 2, { "FunctionDeclaration": {"parameters": "first"} } option:

选项 2, { "FunctionDeclaration": {"parameters": "first"} } 的 正确 代码示例：

/*eslint indent: ["error", 2, {"FunctionDeclaration": {"parameters": "first"}}]*/

function foo(bar, baz,
             qux, boop) {
  qux();
}

FunctionExpression

Examples of incorrect code for this rule with the 2, { "FunctionExpression": {"body": 1, "parameters": 2} } option:

选项 2, { "FunctionExpression": {"body": 1, "parameters": 2} } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "FunctionExpression": {"body": 1, "parameters": 2} }]*/

var foo = function(bar,
  baz,
  qux) {
    qux();
}

Examples of correct code for this rule with the 2, { "FunctionExpression": {"body": 1, "parameters": 2} } option:

选项 2, { "FunctionExpression": {"body": 1, "parameters": 2} } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "FunctionExpression": {"body": 1, "parameters": 2} }]*/

var foo = function(bar,
    baz,
    qux) {
  qux();
}

Examples of incorrect code for this rule with the 2, { "FunctionExpression": {"parameters": "first"} } option:

选项 2, { "FunctionExpression": {"parameters": "first"} } 的 错误 代码示例：

/*eslint indent: ["error", 2, {"FunctionExpression": {"parameters": "first"}}]*/

var foo = function(bar, baz,
  qux, boop) {
  qux();
}

Examples of correct code for this rule with the 2, { "FunctionExpression": {"parameters": "first"} } option:

选项 2, { "FunctionExpression": {"parameters": "first"} } 的 正确 代码示例：

/*eslint indent: ["error", 2, {"FunctionExpression": {"parameters": "first"}}]*/

var foo = function(bar, baz,
                   qux, boop) {
  qux();
}

CallExpression

Examples of incorrect code for this rule with the 2, { "CallExpression": {"arguments": 1} } option:

选项 2, { "CallExpression": {"arguments": 1} } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "CallExpression": {"arguments": 1} }]*/

foo(bar,
    baz,
      qux
);

Examples of correct code for this rule with the 2, { "CallExpression": {"arguments": 1} } option:

选项 2, { "CallExpression": {"arguments": 1} } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "CallExpression": {"arguments": 1} }]*/

foo(bar,
  baz,
  qux
);

Examples of incorrect code for this rule with the 2, { "CallExpression": {"arguments": "first"} } option:

选项 2, { "CallExpression": {"arguments": "first"} } 的 错误 代码示例：

/*eslint indent: ["error", 2, {"CallExpression": {"arguments": "first"}}]*/

foo(bar, baz,
  baz, boop, beep);

Examples of correct code for this rule with the 2, { "CallExpression": {"arguments": "first"} } option:

选项 2, { "CallExpression": {"arguments": "first"} } 的 正确 代码示例：

/*eslint indent: ["error", 2, {"CallExpression": {"arguments": "first"}}]*/

foo(bar, baz,
    baz, boop, beep);

ArrayExpression

Examples of incorrect code for this rule with the 2, { "ArrayExpression": 1 } option:

选项 2, { "ArrayExpression": 1 } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "ArrayExpression": 1 }]*/

var foo = [
    bar,
baz,
      qux
];

Examples of correct code for this rule with the 2, { "ArrayExpression": 1 } option:

选项 2, { "ArrayExpression": 1 } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "ArrayExpression": 1 }]*/

var foo = [
  bar,
  baz,
  qux
];

Examples of incorrect code for this rule with the 2, { "ArrayExpression": "first" } option:

选项 2, { "ArrayExpression": "first" } 的 错误 代码示例：

/*eslint indent: ["error", 2, {"ArrayExpression": "first"}]*/

var foo = [bar,
  baz,
  qux
];

Examples of correct code for this rule with the 2, { "ArrayExpression": "first" } option:

选项 2, { "ArrayExpression": "first" } 的 正确 代码示例：

/*eslint indent: ["error", 2, {"ArrayExpression": "first"}]*/

var foo = [bar,
           baz,
           qux
];

ObjectExpression

Examples of incorrect code for this rule with the 2, { "ObjectExpression": 1 } option:

选项 2, { "ObjectExpression": 1 } 的 错误 代码示例：

/*eslint indent: ["error", 2, { "ObjectExpression": 1 }]*/

var foo = {
    bar: 1,
baz: 2,
      qux: 3
};

Examples of correct code for this rule with the 2, { "ObjectExpression": 1 } option:

选项 2, { "ObjectExpression": 1 } 的 正确 代码示例：

/*eslint indent: ["error", 2, { "ObjectExpression": 1 }]*/

var foo = {
  bar: 1,
  baz: 2,
  qux: 3
};

Examples of incorrect code for this rule with the 2, { "ObjectExpression": "first" } option:

选项 2, { "ObjectExpression": "first" } 的 错误 代码示例：

/*eslint indent: ["error", 2, {"ObjectExpression": "first"}]*/

var foo = { bar: 1,
  baz: 2 };

Examples of correct code for this rule with the 2, { "ObjectExpression": "first" } option:

选项 2, { "ObjectExpression": "first" } 的 正确 代码示例：

/*eslint indent: ["error", 2, {"ObjectExpression": "first"}]*/

var foo = { bar: 1,
            baz: 2 };

ImportDeclaration

Examples of correct code for this rule with the 4, { "ImportDeclaration": 1 } option (the default):

默认选项 4, { "ImportDeclaration": 1 } 的 正确 代码示例：

/*eslint indent: ["error", 4, { "ImportDeclaration": 1 }]*/

import { foo,
    bar,
    baz,
} from 'qux';

import {
    foo,
    bar,
    baz,
} from 'qux';

Examples of incorrect code for this rule with the 4, { "ImportDeclaration": "first" } option:

选项 4, { "ImportDeclaration": "first" } 的 错误 代码示例：

/*eslint indent: ["error", 4, { "ImportDeclaration": "first" }]*/

import { foo,
    bar,
    baz,
} from 'qux';

Examples of correct code for this rule with the 4, { "ImportDeclaration": "first" } option:

选项 4, { "ImportDeclaration": "first" } 的 正确 代码示例：

/*eslint indent: ["error", 4, { "ImportDeclaration": "first" }]*/

import { foo,
         bar,
         baz,
} from 'qux';

flatTernaryExpressions

Examples of incorrect code for this rule with the default 4, { "flatTernaryExpressions": false } option:

默认选项 4, { "flatTernaryExpressions": false } 的 错误 代码示例：

/*eslint indent: ["error", 4, { "flatTernaryExpressions": false }]*/

var a =
    foo ? bar :
    baz ? qux :
    boop;

Examples of correct code for this rule with the default 4, { "flatTernaryExpressions": false } option:

选项 4, { "flatTernaryExpressions": false } 的 正确 代码示例：

/*eslint indent: ["error", 4, { "flatTernaryExpressions": false }]*/

var a =
    foo ? bar :
        baz ? qux :
            boop;

Examples of incorrect code for this rule with the 4, { "flatTernaryExpressions": true } option:

选项 4, { "flatTernaryExpressions": true } 的 错误 代码示例：

/*eslint indent: ["error", 4, { "flatTernaryExpressions": true }]*/

var a =
    foo ? bar :
        baz ? qux :
            boop;

Examples of correct code for this rule with the 4, { "flatTernaryExpressions": true } option:

选项 4, { "flatTernaryExpressions": true } 的 正确 代码示例：

/*eslint indent: ["error", 4, { "flatTernaryExpressions": true }]*/

var a =
    foo ? bar :
    baz ? qux :
    boop;

ignoredNodes

The following configuration ignores the indentation of ConditionalExpression (“ternary expression”) nodes:

下面的配置忽略 ConditionalExpression (三元表达式)节点的缩进:

Examples of correct code for this rule with the 4, { "ignoredNodes": ["ConditionalExpression"] } option:

选项 4, { "ignoredNodes": ["ConditionalExpression"] } 的 正确 代码示例：

/*eslint indent: ["error", 4, { "ignoredNodes": ["ConditionalExpression"] }]*/

var a = foo
      ? bar
      : baz;

var a = foo
                ? bar
: baz;

The following configuration ignores indentation in the body of IIFEs.

下面的配置忽略了 IIFE 中的缩进。

Examples of correct code for this rule with the 4, { "ignoredNodes": ["CallExpression > FunctionExpression.callee > BlockStatement.body"] } option:

选项 4, { "ignoredNodes": ["CallExpression > FunctionExpression.callee > BlockStatement.body"] } 的 正确 代码示例：

/*eslint indent: ["error", 4, { "ignoredNodes": ["CallExpression > FunctionExpression.callee > BlockStatement.body"] }]*/

(function() {

foo();
bar();

})

ignoreComments

Examples of additional correct code for this rule with the 4, { "ignoreComments": true } option:

选项 4, { "ignoreComments": true } 的 正确 代码示例：

/*eslint indent: ["error", 4, { "ignoreComments": true }] */

if (foo) {
    doSomething();

// comment intentionally de-indented
    doSomethingElse();
}

Compatibility

Version

This rule was introduced in ESLint 0.14.0.

该规则在 ESLint 0.14.0 被引入。

Resources