+ String运算符的性能低于StringBuffer.append（）

问题描述：

在我的团队中，我们通常会像这样进行字符串连接：

On my team, we usually do string concatentation like this:

var url = // some dynamically generated URL
var sb = new StringBuffer();
sb.append("<a href='").append(url).append("'>click here</a>");

显然以下内容更具可读性：

Obviously the following is much more readable:

var url = // some dynamically generated URL
var sb = "<a href='" + url + "'>click here</a>";

但JS专家声称 + 运算符的性能低于 StringBuffer.append（）。这是真的吗？

But the JS experts claim that the + operator is less performant than StringBuffer.append(). Is this really true?

答

Internet Explorer是当今世界上唯一真正受此影响的浏览器。（版本5,6和7是狗慢.8没有显示相同的退化。）而且，你的字符串越长，IE变得越来越慢。

Internet Explorer is the only browser which really suffers from this in today's world. (Versions 5, 6, and 7 were dog slow. 8 does not show the same degradation.) What's more, IE gets slower and slower the longer your string is.

如果你有连接的长字符串，那么肯定使用array.join技术。（或者为了便于阅读，可以使用一些StringBuffer包装。）但如果你的字符串很短，请不要打扰。

If you have long strings to concatenate then definitely use an array.join technique. (Or some StringBuffer wrapper around this, for readability.) But if your strings are short don't bother.

+ String运算符的性能低于StringBuffer.append（）

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