semi-spacing
在分号前后强制执行一致的间距
此规则报告的一些问题可通过 --fix 命令行选项自动修复
此规则在 ESLint v8.53.0 中已弃用。请在 @stylistic/eslint-plugin-js 中使用 相应的规则。
¥This rule was deprecated in ESLint v8.53.0. Please use the corresponding rule in @stylistic/eslint-plugin-js.
JavaScript 允许你在分号之前或之后放置不必要的空格。
¥JavaScript allows you to place unnecessary spaces before or after a semicolon.
禁止或强制使用分号周围的空格可以提高程序的可读性。
¥Disallowing or enforcing space around a semicolon can improve the readability of your program.
var a = "b" ;
var c = "d";var e = "f";
规则详情
¥Rule Details
此规则旨在强制在分号周围使用空格。此规则防止在表达式中的分号前使用空格。
¥This rule aims to enforce spacing around a semicolon. This rule prevents the use of spaces before a semicolon in expressions.
在以下情况下，此规则不检查间距：
¥This rule doesn’t check spacing in the following cases:
-
分号后的间距（如果它是行中的第一个标记）。
¥The spacing after the semicolon if it is the first token in the line.
-
如果分号在左括号（
(或{）之后，则为分号之前的空格，如果在右括号（)或}）之前，则为分号之后的空格。该间距由space-in-parens或block-spacing检查。¥The spacing before the semicolon if it is after an opening parenthesis (
(or{), or the spacing after the semicolon if it is before a closing parenthesis ()or}). That spacing is checked byspace-in-parensorblock-spacing. -
具有空条件 (
for(;;)) 的 for 循环中分号周围的间距。¥The spacing around the semicolon in a for loop with an empty condition (
for(;;)).
选项
¥Options
该规则采用一个选项，一个对象，它有两个键 before 和 after，其布尔值 true 或 false。如果 before 是 true，则分号前必须有空格，如果是 false，分号前不允许有空格。如果 after 是 true，分号后强制空格，如果是 false，分号后不允许空格。只有分号不在行尾时才会应用 after 选项。
¥The rule takes one option, an object, which has two keys before and after having boolean values true or false.
If before is true, space is enforced before semicolons and if it’s false, space is disallowed before semicolons.
If after is true, space is enforced after semicolons and if it’s false, space is disallowed after semicolons.
The after option will be only applied if a semicolon is not at the end of line.
默认值为 {"before": false, "after": true}。
¥The default is {"before": false, "after": true}.
"semi-spacing": ["error", {"before": false, "after": true}]
{"before": false, "after": true}
这是默认选项。它强制分号后有空格，不允许分号前有空格。
¥This is the default option. It enforces spacing after semicolons and disallows spacing before semicolons.
此规则的错误代码示例：
¥Examples of incorrect code for this rule:
/*eslint semi-spacing: "error"*/
var foo ;
var foo;var bar;
throw new Error("error") ;
while (a) { break ; }
for (i = 0 ; i < 10 ; i++) {}
for (i = 0;i < 10;i++) {}
此规则的正确代码示例：
¥Examples of correct code for this rule:
/*eslint semi-spacing: "error"*/
var foo;
var foo; var bar;
throw new Error("error");
while (a) { break; }
for (i = 0; i < 10; i++) {}
for (;;) {}
if (true) {;}
;foo();
{"before": true, "after": false}
此选项强制分号前有空格，而分号后不允许有空格。
¥This option enforces spacing before semicolons and disallows spacing after semicolons.
使用 {"before": true, "after": false} 选项的此规则的错误代码示例：
¥Examples of incorrect code for this rule with the {"before": true, "after": false} option:
/*eslint semi-spacing: ["error", { "before": true, "after": false }]*/
var foo;
var foo ; var bar;
throw new Error("error");
while (a) { break; }
for (i = 0;i < 10;i++) {}
for (i = 0; i < 10; i++) {}
使用 {"before": true, "after": false} 选项的此规则的正确代码示例：
¥Examples of correct code for this rule with the {"before": true, "after": false} option:
/*eslint semi-spacing: ["error", { "before": true, "after": false }]*/
var foo ;
var foo ;var bar ;
throw new Error("error") ;
while (a) {break ;}
for (i = 0 ;i < 10 ;i++) {}
何时不使用
¥When Not To Use It
如果你不关心分号前后间距的一致性，你可以关闭此规则。
¥You can turn this rule off if you are not concerned with the consistency of spacing before or after semicolons.
相关规则
版本
此规则是在 ESLint v0.16.0 中引入。