“javascript：”的重点是什么？在代码（而不是URL）？ [英] What's the point of "javascript:" in code (not URLs)?

问题描述

我偶然发现了一些我以前从未见过的奇怪的事情：

I stumbled upon something strange that I never really seen before:

javascript:a=a+10;

上面的行似乎是正确的并且评价得很开心（至少在Firefox中），就像 javascript：部分从未存在。

The line above seems to be correct and evaluates happily (at least in Firefox) just like if the javascript: part never existed.

虽然我明白旧的 javascript的目的：在 style < a href =../> https://en.wikipedia.org/wiki/Dynamic_HTMLrel =noreferrer> DHTML ，我只是无法在纯JavaScript代码中弄清楚这个前缀的任何有用用法。

While I do understand the purpose of the old javascript:void(...) style <a href=".."/> used during the dark ages of DHTML, I just can't figure out any useful usage of this prefix in plain JavaScript code.

它有一些特殊含义吗？

推荐答案

javascript ：是一个标签。它应该用于识别循环，以便您可以使用 break javascript; 来突破它，但在这里被滥用。它是无害的，但是对于不是循环的语句添加标签可能不是一个好主意。

The "javascript:" is a label. It's supposed to be used to identify a loop so that you could then use "break javascript;" to break out of it, but is being misused here. It's harmless, but probably not a good idea to add a label to a statement that isn't a loop.

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