require parentheses when invoking a constructor with no arguments (new-parens)

要求调用无参构造函数时带括号 (new-parens)

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。

JavaScript allows the omission of parentheses when invoking a function via the new keyword and the constructor has no arguments. However, some coders believe that omitting the parentheses is inconsistent with the rest of the language and thus makes code less clear.

在 JavaScript 中，如果通过 new 关键调用一个函数而且它的构造函数不带参数，则可以省略后面圆括号。然而，一些程序员认为省略圆括号与整体不一致，从而使代码不清晰。

var person = new Person;

Rule Details

This rule can enforce or disallow parentheses when invoking a constructor with no arguments using the new keyword.

当使用 new 关键字调用没有参数的构造函数时，此规则可以强制或禁止括号。

Options

This rule takes one option.

此规则接受一个选项。

• "always" enforces parenthesis after a new constructor with no arguments (default)
• "always" 强制括号后的新构造函数没有参数（默认）
• "never" enforces no parenthesis after a new constructor with no arguments
• "never" 强制在没有参数的新构造函数后不出现任何圆括号

always

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

选项 "always" 的 错误 代码示例：

/*eslint new-parens: "error"*/

var person = new Person;
var person = new (Person);

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

选项 "always" 的 正确 代码示例：

/*eslint new-parens: "error"*/

var person = new Person();
var person = new (Person)();

never

Examples of incorrect code for this rule with the "never" option:

选项 "never" 的 错误 代码示例：

/*eslint new-parens: ["error", "never"]*/

var person = new Person();
var person = new (Person)();

Examples of correct code for this rule with the "never" option:

选项 "never" 的 正确 代码示例：

/*eslint new-parens: ["error", "never"]*/

var person = new Person;
var person = (new Person);
var person = new Person("Name");

Version

This rule was introduced in ESLint 0.0.6.

该规则在 ESLint 0.0.6 中被引入。

Resources

• Rule source
• Documentation source