no-func-assign

禁止重新分配 function 声明

JavaScript 函数可以写成 FunctionDeclaration function foo() { ... } 或 FunctionExpression var foo = function() { ... };。虽然 JavaScript 解释器可能会容忍它，但覆盖/重新分配编写为 FunctionDeclaration 的函数通常表明存在错误或问题。

¥JavaScript functions can be written as a FunctionDeclaration function foo() { ... } or as a FunctionExpression var foo = function() { ... };. While a JavaScript interpreter might tolerate it, overwriting/reassigning a function written as a FunctionDeclaration is often indicative of a mistake or issue.

function foo() {}
foo = bar;
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规则详情

¥Rule Details

此规则不允许重新分配 function 声明。

¥This rule disallows reassigning function declarations.

此规则的错误代码示例：

¥Examples of incorrect code for this rule:

/*eslint no-func-assign: "error"*/

function foo() {}
foo = bar;

function baz() {
    baz = bar;
}

var a = function hello() {
  hello = 123;
};
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与 JSHint 中的相应规则不同，此规则的错误代码示例：

¥Examples of incorrect code for this rule, unlike the corresponding rule in JSHint:

/*eslint no-func-assign: "error"*/

foo = bar;
function foo() {}
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此规则的正确代码示例：

¥Examples of correct code for this rule:

/*eslint no-func-assign: "error"*/

var foo = function () {}
foo = bar;

function baz(baz) { // `baz` is shadowed.
    baz = bar;
}

function qux() {
    var qux = bar;  // `qux` is shadowed.
}
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由 TypeScript 处理

使用 TypeScript 时禁用此规则是安全的，因为 TypeScript 的编译器强制执行此检查。

版本

此规则是在 ESLint v0.0.9 中引入。

资源

• 规则源码
• 测试源码