引导程序模式中的href && href.replace（/.*（？=＃[^ \\ s] + $）/，''）注释为“ strip for ie7”，该行对ie7有什么作用？

Question

I am just wondering what goods does this line do for IE7? This code snippet is from bootstrap modal source code.

var $target = $($this.attr('data-target') || (href && href.replace(/.*(?=#[^\s]+$)/, ''))) // strip for ie7

Answer 1

Until IE8 there was a "feature" in IE's implementation of getAttribute()

If you have an <a> tag like this

<a href="#anchor">link</a>

and you are using element.getAttribute('href') IE7 returns the absolute path - http://example.com/index.html#anchor while other browsers just returns #anchor .

The regex in bootstrap takes care of this - it removes anything before # .

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Update. See also this very old question in SO (oct 2009!) -> Wrong extraction of .attr(“href”) in IE7 vs all other browsers? with various suggestions of how to solve the problem. Twitter Bootstraps solution is far better, in my opinion.