一段时间以来，人们一直被警告在浏览器中禁用Java，或者在系统中完全删除它，除非他们真的需要它。但是，如果你禁用或删除它，你真的失去了很多，如果有的话，功能？今天的超级用户问答帖子回答了一位关注的读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者Mark Wolinsky想知道，如果他禁用基于浏览器的Java，是否会失去任何功能：

I have read that disabling Java (not JavaScript) will make my computer safer from malicious software attacks. All indicati*** are that it will indeed make it safer, but I have not seen any real indicati*** out there as to what functionality I will lose in the browsing experience, if anything. Can someone tell me what I would or would not experience if I disable Java and is it really necessary for browsing these days?

如果马克禁用基于浏览器的Java，他真的会失去任何功能吗？

答案

超级用户贡献者JakeGould为我们提供了答案：

• Can someone tell me what I would or would not experience if I disable Java and is it really necessary for browsing these days?

This is a fairly good question. What it boils down to is this: If you need Java in a browser, you will know so right away. If you do not need Java (and are unaware if you are even using it or not), chances are good that you will never miss it or bump into it again. The chances of a casual user tripping over a website that would truly need Java to function in 2015 is rare at best nowadays.

Just so you understand the history of Java and the web, Java is essentially a “black box” virtual machine that allows you to code in Java and then run that code on any system that can run Java. The concept was that Java would be a middle ground platform that could run on any machine: Windows, Macintosh, Linux, etc. The Java plugin simply allows you to run Java apps from within a web browser. This was appealing in the early days of the Internet due to a lack of cross-platform compatibilities and other “rough edges” of the early Internet.

But in 2015, most of the “fancy” base-level functionality that Java provided in the past (cool graphics, effects, and such) are now handled within the browser itself via CSS, HTML, and JavaScript. Back in the late 1990s/early-2000s, lots of creative sites used Java because native browsers could not handle the tricks one could only do in Java back then. Java even came bundled as a basic plugin in Netscape Navigator back in the day thanks to the commonly accepted functionality it provided.

Now where you might miss it in 2015 depends on the kinds of websites you access. For example, I know that many financial systems accessible online (such as personal tax systems, payroll gateways, and other such systems) use complex Java applicati*** to allow end users to get a richer experience with their financial tools. So if you are using your computer to access web-based financial applicati*** like that, then you definitely need Java enabled. But in my experience, even in those cases, many such instituti*** are slowly moving their archaic Java-based systems to a more stable, non-Java-based setup that takes better advantage of modern web browser functionality.

For example, a little over a year ago anyone using the browser-based screen sharing software/service GoToMeeting needed to have Java enabled in their browser as well as on their system. But as explained in this support forum thread on their site, they have now officially dropped the Java requirement in favor of their own non-Java-based software tool:

• In the past we used to use Java to automate launching our software, we have since replaced that method with our own launcher. Since introducing our launcher, we no longer use Java.

So my advice is if Java worries you as a potential security concern on a browser level, just disable it for now. I am pretty confident that you will not miss it. And if, in like 8 to 9 months, you need Java for some reason, deal with it then.

HTG注意：如果您的系统不需要Java，我们建议您完全卸载它或禁用浏览器插件。

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