JavaScript：JSLint错误“for的主体应该包含在if语句中以从原型中过滤掉不需要的属性” [英] JavaScript: JSLint error "The body of a for in should be wrapped in an if statement to filter unwanted properties from the prototype"

问题描述

我正在使用 JSLint 工具来确保我的JavaScript严格。

I'm using the JSLint tool to ensure my JavaScript is "strict".

我收到以下错误但不明白如何修复它：

I'm receiving the following error but don't understand how to fix it:

The body of a for in should be wrapped in an if statement to filter unwanted properties from the prototype

For以下代码：

for (var i in keypairs) {
    ...
}

任何人都有任何想法如何修复它的JavaScript严格并且不会被JSLint标记

Anyone have any ideas how to fix this to that it's JavaScript "strict" and won't be flagged by JSLint

推荐答案

如果密钥对是一个数组，那么你应该真的迭代元素如：

If keypairs is an array, then you should really iterate over the elements like:

for(var i = 0; i < keypairs.length; i++) {
  ...
}

如果密钥对是一个哈希，然后JSLint正确地建议你检查你是否在运行t他适当的密钥类型（即，确认哈希是预期的类型）

If keypairs is a hash, then JSLint is correctly recommending that you check that you are operating on the appropriate key type (i.e., confirming that the hash is the expected type)

所以类似

for(var i in keypairs) {
  if(keypairs.hasOwnProperty(i)) {
    ...
  }
}

其中if验证了什么标准，确保你没有访问原型函数等。

where the if is validating whatever criteria ensures that you are not accessing a prototype function etc.

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