JavaScript 犀牛 + JQuery简单脚本性能问题

发布于 2024-11-29 22:08:36 字数 1363 浏览 5 评论 0原文

想问一下今天是否有可能在Rhino 的独立模式下运行javascript 以获得良好的性能。

我在运行 Rhino、EnvJS + JQuery 脚本时遇到性能问题。

这是脚本：

load('tools/envjs/env.rhino.js')
window.location = "test.html"
load('tools/jquery.js')

// add TOC div
$('body').append('<div id="toc"></div>');

// Build TOC
$("h1, h2, h3").each(function(i) {
    var current = $(this);
    current.attr("id", "title" + i);

    var pos = current.position().top / $("#content").height() * $(window).height();
    $("#toc").append("<a id='link" + i + "' href='#title" + i +
    "' title='" + current.attr("tagName") + "'>" +
    current.html() + "</a>");

    $("#link" + i).css("top", pos);
});    
Envjs.writeToFile(document.documentElement.outerHTML, Envjs.uri('test-toc.html'))

这是我在网上找到的脚本的稍微修改版本，用于为输入 html 文档构建目录。

我使用以下命令在 3.06Ghz 处理器上的命令行上运行它：

$ time java -jar tools/js.jar -opt -1 tools/make-toc.js 
[  Envjs/1.6 (Rhino; U; Mac OS X x86_64 10.7; en-US; rv:1.7.0.rc2) Resig/20070309 PilotFish/1.2.13  ]

real    0m16.554s
user    0m34.131s
sys 0m1.288s

完成相当多的处理需要 16 秒。我还发现最慢的部分是 Build TOC - 大部分时间大约需要 10 秒。

只是补充一点，输入文件或多或少是一个 23 KB 大小的小文档。

我想知道为什么要跑这么长时间。我希望它能在不到一秒的时间内完成。

问题：这里性能损失的根源是什么？我可以想象的选项： 1) 犀牛 2) 环境J 3）JQuery 4) 我的脚本

如果有任何其他执行环境的建议，我们将不胜感激。但需要注意的是，它需要集成到跨平台开发周期中。

原文

Wanted to ask if it's possible today to have a good performance for running javascript in standalone mode with Rhino.

I have a performance issue running Rhino, EnvJS + JQuery script.

Here is the script:

load('tools/envjs/env.rhino.js')
window.location = "test.html"
load('tools/jquery.js')

// add TOC div
$('body').append('<div id="toc"></div>');

// Build TOC
$("h1, h2, h3").each(function(i) {
    var current = $(this);
    current.attr("id", "title" + i);

    var pos = current.position().top / $("#content").height() * $(window).height();
    $("#toc").append("<a id='link" + i + "' href='#title" + i +
    "' title='" + current.attr("tagName") + "'>" +
    current.html() + "</a>");

    $("#link" + i).css("top", pos);
});    
Envjs.writeToFile(document.documentElement.outerHTML, Envjs.uri('test-toc.html'))

It's a slightly modified version of the script I've found on the web to build a TOC for input html document.

I run it on command line on 3.06Ghz processor using following command:

$ time java -jar tools/js.jar -opt -1 tools/make-toc.js 
[  Envjs/1.6 (Rhino; U; Mac OS X x86_64 10.7; en-US; rv:1.7.0.rc2) Resig/20070309 PilotFish/1.2.13  ]

real    0m16.554s
user    0m34.131s
sys 0m1.288s

It takes 16 seconds to complete quite a lot for processing.
I've also found that the most slow part is Build TOC - it takes most of the time about 10 seconds.

Just to add that input file is more or less small document 23 kilobytes size.

I wonder why it takes so long to run. I would expect it to complete in less than a second.

Question: what is the source of performance loss here?
Options I can imagine:
1) Rhino
2) EnvJs
3) JQuery
4) My Script

Any suggestions of other execution environments would be quite appreciated. But need to note that it requires to be integrated into cross-platform development cycle.

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