eqeqeq

需要使用 ===!==

一些该规则报告的问题可以通过 --fix 命令行选项 自动修复

使用类型安全的相等运算符 ===!== 而不是它们的常规对应项 ==!= 被认为是一种很好的做法。

原因是 ==!= 在相当晦涩的 抽象等式比较算法 之后进行类型强制。例如,以下语句都被视为 true

  • [] == false
  • [] == ![]
  • 3 == "03"

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规则详情

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/*eslint eqeqeq: "error"*/

if (x == 42) { }

if ("" == text) { }

if (obj.getStuff() != undefined) { }

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选项

always

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/*eslint eqeqeq: ["error", "always"]*/

a == b
foo == true
bananas != 1
value == undefined
typeof foo == 'undefined'
'hello' != 'world'
0 == 0
true == true
foo == null

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/*eslint eqeqeq: ["error", "always"]*/

a === b
foo === true
bananas !== 1
value === undefined
typeof foo === 'undefined'
'hello' !== 'world'
0 === 0
true === true
foo === null

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smart

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/*eslint eqeqeq: ["error", "smart"]*/

// comparing two variables requires ===
a == b

// only one side is a literal
foo == true
bananas != 1

// comparing to undefined requires ===
value == undefined

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/*eslint eqeqeq: ["error", "smart"]*/

typeof foo == 'undefined'
'hello' != 'world'
0 == 0
true == true
foo == null

allow-null

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["error", "always", {"null": "ignore"}]

何时不使用

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