array-bracket-spacing
Enforce consistent spacing inside array brackets
Some problems reported by this rule are automatically fixable by the --fix command line option
一些风格指南要求或不允许在数组括号和其他标记之间有空格。这条规适用于数组字面量和解构赋值（ECMAScript 6）。
/*eslint-env es6*/
var arr = [ 'foo', 'bar' ];
var [ x, y ] = z;
var arr = ['foo', 'bar'];
var [x,y] = z;
规则细节
这条规则使数组括号内的间距一致。
选项
此规则有个值为字符串的选项：
"never"（默认值）禁止数组括号内的空格"always"数组括号内需要一个或多个空格或换行
此规则有一个用于处理例外情况的 "never" 选项：
"singleValue": true单一元素的数组字面量的括号内要有一个或多个空格或换行"objectsInArrays": true数组字面量的括号和它们的对象字面元素的括号[ {或} ]间要有一个或多个空格或换行。"arraysInArrays": true数组字面量的大括号和其数组字面量元素的大括号[ [或] ]间要有一个或多个空格或换行。
此规则有一个用于处理例外情况的 "always" 选项：
"singleValue": false禁止包含单一元素的数组字面量的括号内的空格"objectsInArrays": false禁止数组字面量的括号和其对象字面元素的括号[{或}]间的空格。"arraysInArrays": false禁止数组字面量和其数组字面量元素的括号[[或 ``]]` 间的空格。
这个规则有内置的例外。
"never"（以及"always"选项的例外）允许在数组括号内换行，因为这是一个常见的模式。"always"不要求空格或换行在空的数组字面量[]。
never
使用此规则与默认 "never" 选项的错误示例：
/*eslint array-bracket-spacing: ["error", "never"]*/
/*eslint-env es6*/
var arr = [ 'foo', 'bar' ];
var arr = ['foo', 'bar' ];
var arr = [ ['foo'], 'bar'];
var arr = [[ 'foo' ], 'bar'];
var arr = [ 'foo',
'bar'
];
var [ x, y ] = z;
var [ x,y ] = z;
var [ x, ...y ] = z;
var [ ,,x, ] = z;
使用此规则与默认 "never" 选项的正确示例：
/*eslint array-bracket-spacing: ["error", "never"]*/
/*eslint-env es6*/
var arr = [];
var arr = ['foo', 'bar', 'baz'];
var arr = [['foo'], 'bar', 'baz'];
var arr = [
'foo',
'bar',
'baz'
];
var arr = ['foo',
'bar'
];
var arr = [
'foo',
'bar'];
var [x, y] = z;
var [x,y] = z;
var [x, ...y] = z;
var [,,x,] = z;
always
使用此规则与 "always" 选项的错误示例：
/*eslint array-bracket-spacing: ["error", "always"]*/
/*eslint-env es6*/
var arr = ['foo', 'bar'];
var arr = ['foo', 'bar' ];
var arr = [ ['foo'], 'bar' ];
var arr = ['foo',
'bar'
];
var arr = [
'foo',
'bar'];
var [x, y] = z;
var [x,y] = z;
var [x, ...y] = z;
var [,,x,] = z;
使用此规则与 "always" 选项的正确示例：
/*eslint array-bracket-spacing: ["error", "always"]*/
/*eslint-env es6*/
var arr = [];
var arr = [ 'foo', 'bar', 'baz' ];
var arr = [ [ 'foo' ], 'bar', 'baz' ];
var arr = [ 'foo',
'bar'
];
var arr = [
'foo',
'bar' ];
var arr = [
'foo',
'bar',
'baz'
];
var [ x, y ] = z;
var [ x,y ] = z;
var [ x, ...y ] = z;
var [ ,,x, ] = z;
singleValue
使用此规则与 "always", { "singleValue": false } 选项的错误示例：
/*eslint array-bracket-spacing: ["error", "always", { "singleValue": false }]*/
var foo = [ 'foo' ];
var foo = [ 'foo'];
var foo = ['foo' ];
var foo = [ 1 ];
var foo = [ 1];
var foo = [1 ];
var foo = [ [ 1, 2 ] ];
var foo = [ { 'foo': 'bar' } ];
使用此规则与 "always", { "singleValue": false } 选项的正确示例：
/*eslint array-bracket-spacing: ["error", "always", { "singleValue": false }]*/
var foo = ['foo'];
var foo = [1];
var foo = [[ 1, 1 ]];
var foo = [{ 'foo': 'bar' }];
objectsInArrays
使用此规则与 "always", { "objectsInArrays": false } 选项的错误示例：
/*eslint array-bracket-spacing: ["error", "always", { "objectsInArrays": false }]*/
var arr = [ { 'foo': 'bar' } ];
var arr = [ {
'foo': 'bar'
} ]
使用此规则与 "always", { "objectsInArrays": false } 选项的正确示例：
/*eslint array-bracket-spacing: ["error", "always", { "objectsInArrays": false }]*/
var arr = [{ 'foo': 'bar' }];
var arr = [{
'foo': 'bar'
}];
arraysInArrays
使用此规则与 "always", { "arraysInArrays": false } 选项的错误示例：
/*eslint array-bracket-spacing: ["error", "always", { "arraysInArrays": false }]*/
var arr = [ [ 1, 2 ], 2, 3, 4 ];
var arr = [ [ 1, 2 ], 2, [ 3, 4 ] ];
使用此规则与 "always", { "arraysInArrays": false } 选项的正确示例：
/*eslint array-bracket-spacing: ["error", "always", { "arraysInArrays": false }]*/
var arr = [[ 1, 2 ], 2, 3, 4 ];
var arr = [[ 1, 2 ], 2, [ 3, 4 ]];
何时不用
如果你不关心数组括号之间间距是否一致，你可以关闭这个规则。
Related Rules
Version
This rule was introduced in ESLint v0.24.0.