jQuery add text before href attribute

问题

How can I add text to before a href attribute?

Example:

<a href="/page/subpage">Link!</a>

To:

<a href="http://www.example.com/page/subpage">Link!</a>

I have tried this, which is not working:

$('http://www.example.com').insertBefore('a[href=]');

回答1:

You can use a callback function with attr:

$('a[href]').attr('href', function(index, href) {
    if (href.indexOf('http') === 0) {
        return href;
    } else {
        return 'http://www.example.com' + href;
    }
});

The more cryptic way would be to use the <base> tag:

$('<base href="http://www.example.com/">').appendTo('body');

Or just put it into your HTML:

<base href="http://www.example.com/">

It'll force all relative URLs to resolve relative to this URL.

回答2:

Just change href attribute:

$('a:not([href*="//"])').attr(function(_, href){
    return "http://www.example.com" + href;
});

来源：https://stackoverflow.com/questions/16739832/jquery-add-text-before-href-attribute