保留 sprintf 输出前导空白的最有效方法
给出以下有效的代码：
for (i=0; i<nLinears; i++) {
for (j=0; j<nLinearPts[i]-1; j++) {
$wb.upLinearLoad.append('<div>' + sprintf("%5s%8.1f to%7.1f%8.1f"
,sLinearSegName[i][j],fLinearPtBA[i][j],fLinearPtBA[i][j+1],fLen)
.replace(/ /g," "));
}
}
这可以确保当数字从小（更多前导空格）变为大（更少前导空格）时，列间距将保持不变。但是，据我了解，使用 .replace 的正则表达式效率不高，并且由于我在整个应用程序中都有这种结构，因此我需要让它尽可能快地运行。
我相信 jQuery .text() 会满足我的需要，但我还需要 .append() .text() 结果，而且我不知道如何让它们一起工作。
任何建议将不胜感激。
Given the following code which works:
for (i=0; i<nLinears; i++) {
for (j=0; j<nLinearPts[i]-1; j++) {
$wb.upLinearLoad.append('<div>' + sprintf("%5s%8.1f to%7.1f%8.1f"
,sLinearSegName[i][j],fLinearPtBA[i][j],fLinearPtBA[i][j+1],fLen)
.replace(/ /g," "));
}
}
This ensures that as the numbers change from small (more leading spaces) to large (fewer leading spaces), the column spacing will be maintained. However, as I understand it, using the regular expression for the .replace is not efficient, and as I have this kind of structure throughout the application, I need to have it run as fast as possible.
I believe that jQuery .text() will take care my need, but I also need to .append() the .text() result, and I can't figure out how to make them work together.
Any suggestions will be greatly appreciated.
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评论（3）
您可以更新 sprintf() 函数以首先输出不间断空格。
但是您是否真的发现使用正则表达式
.replace()存在性能问题？我认为你不会有问题。鉴于您似乎有表格数据，为什么不使用？这就是表格的用途。You could update the
sprintf()function to output non-breaking spaces in the first place.But have you actually found a performance problem using a regex
.replace()? I don't think you'll have a problem. Given that you seem to have tabular data, why don't you use a<table>? This is what tables are for.您可以将它们放入
这通常会使用固定宽度的字体来格式化它们并保留空格，而无需任何额外的工作。
如果这不能完美工作并且您需要替代方案，您可以 查看有关如何在不同上下文中使用预格式化文本的问题。
You could put these in
<pre>elements instead of string-replacingThis would (usually) format them with a fixed-width font and preserve spaces without any extra work. The
<pre>is for preformatted text, which makes sense for what you have here.If this doesn't work perfectly and you need alternatives, you could check out this question about how to use pre-formatted text in different contexts.
我查看了 sprintf()，发现一个简单的单语句更改就产生了我所需要的内容：
感谢 sprintf() 实现的作者使用有意义的变量名称。
I looked at sprintf() and found that a simple one-statement change produced what I needed:
My thanks to the author of the sprintf() implementation for using meaningful variable names.