noVar

JavaScript (and super languages)

摘要

¥Summary

规则生效日期：v1.0.0

¥Rule available since: v1.0.0
诊断类别：lint/suspicious/noVar

¥Diagnostic Category: lint/suspicious/noVar
此规则包含 unsafe 修复程序。

¥This rule has an unsafe fix.
此规则的默认严重级别为 warning。

¥The default severity of this rule is warning.
来源：

¥Sources:
- 与 no-var 相同
  
  ¥Same as no-var

如何配置

¥How to configure

1
{
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  "linter": {
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    "rules": {
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      "suspicious": {
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        "noVar": "error"
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      }
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    }
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  }
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}

描述

¥Description

禁止使用 var

¥Disallow the use of var

ECMAScript 6 允许程序员使用 let 和 const 关键字创建具有块作用域而不是函数作用域的变量。

¥ECMAScript 6 allows programmers to create variables with block scope instead of function scope using the let and const keywords.

块范围在许多其他编程语言中很常见，可辅助程序员避免错误。

¥Block scope is common in many other programming languages and helps programmers avoid mistakes.

示例

¥Examples

无效

¥Invalid

1
var foo = 1;

code-block.js:1:1 lint/suspicious/noVar  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use let or const instead of var.
  
  > 1 │ var foo = 1;
      │ ^^^^^^^^^^^
    2 │ 
  
  ℹ A variable declared with var is accessible in the whole module. Thus, the variable can be accessed before its initialization and outside the block where it is declared.
  
  ℹ See MDN web docs for more details.
  
  ℹ Unsafe fix: Use ‘const’ instead.
  
    1   │ - var·foo·=·1;
      1 │ + const·foo·=·1;
    2 2 │

有效

¥Valid

1
const foo = 1;
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let bar = 1;

noVar

摘要

如何配置

描述

示例

无效

有效

相关链接