JavaScript点表示法 [英] JavaScript dot notation

问题描述

以下一行显然是用点表示法编写的。我正在尝试清理我的JavaScript代码以使其严格。这是什么意思？

The following line is apparently written best in dot notation. I am trying to clean my JavaScript code to make it strict. What does it mean?

if (ie||ns6)
{
    var tipobj=document.all? document.all["dhtmltooltip"] : document.getElementById? document.getElementById("dhtmltooltip") : "";
}

我在代码行中添加了一些上下文，如果有帮助的话？
我对 DOM 一无所知。我不是要支持Internet Explorer 4，这不是我的代码，我自己也无法编写JavaScript。我只是试图让它符合要求并且 JSLint 工具说明了这一行：

I added some context to my line of code, in case this helps? I know nothing about DOM. I am not trying to support Internet Explorer 4, this is not my code and I wouldn't be able to write JavaScript myself. I am only trying to get it compliant and the JSLint tool says about this line:

17行字符43的问题：['dhtmltooltip']最好用点表示法编写。

Problem at line 17 character 43: ['dhtmltooltip'] is better written in dot notation.

推荐答案

有两个在JavaScript中访问对象属性的方法。

点符号

foo.bar.baz

Square括号表示法

foo['bar']['baz']

您在部分代码中使用后者。

You are using the latter in part of your code.

Douglas Crockford，谁编写了JSLint（一个提供该错误消息的工具），认为在可能的情况下最好使用点符号。

Douglas Crockford, who wrote JSLint (a tool which gives that error message), is of the opinion that is is better to use dot notation where possible.

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