函数声明不应放在块中。使用函数表达式或将语句移动到外部函数的顶部 [英] Function declarations should not be placed in blocks. Use a function expression or move the statement to the top of the outer function

问题描述

我有以下代码：

if (typeof console === "object" && typeof console.error === "function") {
    function e(msg) {"use strict"; console.info(msg);}
}

jsLint给出了以下错误：

For which jsLint gives the following error:

不应将函数语句放在块中。使用函数表达式或将语句移动到外部函数的顶部。

Function statements should not be placed in blocks. Use a function expression or move the statement to the top of the outer function.

为什么它会出现此错误，它是什么意思？

Why is it giving this error and what does it mean?

推荐答案

你不应该在if中创建函数。你做得好多了：

You should not be creating function inside if block. You are much better off doing:

var e = function(){};

if(typeof console === "object" && typeof console.error === "function"){
    e = function (msg){ ... };
}

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