YUI Compressor:什么是微优化? [英] YUI Compressor: What are micro optimizations?

问题描述

YUI Compressor在其(不是很广泛)的文档中将此作为一种选择:

YUI Compressor, in its (not very extensive) documentation states this as an option:

--disable-optimizations
    Disable all the built-in micro optimizations.

有人知道这意味着什么吗?
这将打开/关闭什么?
我还没有找到任何相关文档.

Does anyone know what this means?
What will this turn on/off?
I haven't found any documentation about it.

谢谢！

推荐答案

查看JavaScriptCompressor的来源:

Looking at the source of JavaScriptCompressor:

行548 -

    if (!disableOptimizations) {
        optimizeObjectMemberAccess(this.tokens);
        optimizeObjLitMemberDecl(this.tokens);
    }

行467 -

/*
* Transforms obj["foo"] into obj.foo whenever possible, saving 3 bytes.
*/
private static void optimizeObjectMemberAccess(ArrayList tokens) {

行497 -

/*
 * Transforms 'foo': ... into foo: ... whenever possible, saving 2 bytes.
 */
private static void optimizeObjLitMemberDecl(ArrayList tokens) {

因此，它正在将foo['bar']中的常量字符串的使用转换为foo.bar，并将{'bar':x}中的常量字符串的使用转换为{bar:x}.

So it's converting use of constant strings in foo['bar'] to foo.bar and {'bar':x} to {bar:x}.

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