blocks|key|3464749|text|简单的字符串操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3464750|​|3464751|var+url+=+'https://img.evbuc.com/moreStuff'
var+newUrl+=+url.split('//')[0]+%2B+'//www.'+%2B+url.split('//')[1]
console.log(newUrl)|code-block|syntax|javascript|3464752|3464753|另一种方法是这样做的：|3464754|3464755|var+url+=+'https://img.evbuc.com/moreStuff'
var+newUrl+=+url.replace('https://',+'https://www.')
console.log(newUrl)|3464756|3464757|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|V|8|@]|9|@]|A|$]]|$1|L|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$G|H]]|$1|O|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|Q|$]]

<p>Simple string operations:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var url = 'https://img.evbuc.com/moreStuff'
var newUrl = url.split('//')[0] + '//www.' + url.split('//')[1]
console.log(newUrl)</code></pre>
</div>
</div>
</p>

<p>and yet another way to do this is like this:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var url = 'https://img.evbuc.com/moreStuff'
var newUrl = url.replace('https://', 'https://www.')
console.log(newUrl)</code></pre>
</div>
</div>
</p>


blocks|key|4933506|text|您可以使用正则表达式来搜索和替换。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4933507|下面的示例也适用于：|4933508|4933509|http://img.evbuc.com/moreStuff|unordered-list-item|offset|length|style|CODE|4933510|//img.evbuc.com/moreStuff|4933511|https://img.evbuc.com/moreStuff//someMoreStuff|4933512|4933513|​|4933514|function+prependUrl(url)+{
++return+url.replace(/%5E([%5E\/]*)(\/\/)(.*)/,+'$1//www.$3');
}

const+urls+=+[
++++'https://img.evbuc.com/moreStuff',
++++'http://img.evbuc.com/moreStuff',
++++'//img.evbuc.com/moreStuff',
++++'https://img.evbuc.com/moreStuff//someMoreStuff'
];

urls.forEach((url)+=>+console.log(`${+url+}+->+${+prependUrl(url)+}`));|code-block|syntax|javascript|4933515|4933516|4933517|正则表达式包含3个捕获组：|4933518|4933519|1.+Select+everything+up+to+the+first+`/`+(excluding)
2.+Select+the+`//`+(for+protocol+root)
3.+Select+the+rest|4933520|4933521|替换值会将所有内容带到第一个/+(可能是一个空字符串，因为well)|4933522|Replace+|4933523|+//+with+//www.|4933524|Append+|4933525|/|4933526|4933527|4933528|4933529|entityMap^0|0|0|0|0|U|0|0|P|0|0|1A|0|0|0|0|0|0|0|0|0|0|E|1|0|0|1|2|9|6|0|1|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1L|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|1N|8|@$H|1O|I|1P|J|K]]|9|@]|A|$]]|$1|L|3|M|5|G|7|1Q|8|@$H|1R|I|1S|J|K]]|9|@]|A|$]]|$1|N|3|O|5|G|7|1T|8|@$H|1U|I|1V|J|K]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1X|8|@]|9|@]|A|$]]|$1|S|3|T|5|U|7|1Y|8|@]|9|@]|A|$V|W]]|$1|X|3|R|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|20|8|@]|9|@]|A|$]]|$1|Z|3|10|5|G|7|21|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|22|8|@]|9|@]|A|$]]|$1|12|3|13|5|U|7|23|8|@]|9|@]|A|$V|W]]|$1|14|3|R|5|6|7|24|8|@]|9|@]|A|$]]|$1|15|3|16|5|6|7|25|8|@$H|26|I|27|J|K]]|9|@]|A|$]]|$1|17|3|18|5|G|7|28|8|@]|9|@]|A|$]]|$1|19|3|1A|5|G|7|29|8|@$H|2A|I|2B|J|K]|$H|2C|I|2D|J|K]]|9|@]|A|$]]|$1|1B|3|1C|5|G|7|2E|8|@]|9|@]|A|$]]|$1|1D|3|1E|5|G|7|2F|8|@$H|2G|I|2H|J|K]]|9|@]|A|$]]|$1|1F|3|-4|5|6|7|2I|8|@]|9|@]|A|$]]|$1|1G|3|-4|5|6|7|2J|8|@]|9|@]|A|$]]|$1|1H|3|-4|5|6|7|2K|8|@]|9|@]|A|$]]|$1|1I|3|-4|5|6|7|2L|8|@]|9|@]|A|$]]]|1J|$]]

<p>You can use a regular expression to search and replace.</p>

<p>Following example also works with:</p>

<ul>
<li><code>http://img.evbuc.com/moreStuff</code></li>
<li><code>//img.evbuc.com/moreStuff</code></li>
<li><code>https://img.evbuc.com/moreStuff//someMoreStuff</code></li>
</ul>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>function prependUrl(url) {
  return url.replace(/^([^\/]*)(\/\/)(.*)/, '$1//www.$3');
}

const urls = [
    'https://img.evbuc.com/moreStuff',
    'http://img.evbuc.com/moreStuff',
    '//img.evbuc.com/moreStuff',
    'https://img.evbuc.com/moreStuff//someMoreStuff'
];

urls.forEach((url) =&gt; console.log(`${ url } -&gt; ${ prependUrl(url) }`));</code></pre>
</div>
</div>
</p>

<ul>
<li><p>The regular expression contains 3 capturing groups:</p>

<ol>
<li>Select everything up to the first <code>/</code> (excluding)</li>
<li>Select the <code>//</code> (for protocol root)</li>
<li>Select the rest</li>
</ol></li>
<li><p>The replacement value takes everything up to the first <code>/</code> (which may be an empty string as well)</p></li>
<li>Replace the <code>//</code> with <code>//www.</code></li>
<li>Append the rest</li>
</ul>


blocks|key|1148428|text|为此，您不需要正则表达式，只需使用URL+api即可|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1148429|​|1148430|let+url+=+"https://img.evbuc.com/moreStuff"

let+parsed+=+new+URL(url)

parsed.host+=+parsed.host.startsWith('www.')+?+parsed.host+:+"www."%2B+parsed.host

console.log(parsed)|code-block|syntax|javascript|1148431|1148432|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/API/URL^0|H|3|H|3|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|13|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]]]

<p>You don't need regex for this you can simply use <a href="https://developer.mozilla.org/en-US/docs/Web/API/URL" rel="nofollow noreferrer"><code>URL</code></a> api</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>let url = "https://img.evbuc.com/moreStuff"

let parsed = new URL(url)

parsed.host = parsed.host.startsWith('www.') ? parsed.host : "www."+ parsed.host

console.log(parsed)</code></pre>
</div>
</div>
</p>


blocks|key|1148440|text|如果你想要能与任何协议一起工作的东西，试试这个正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1148441|var+url+=+"https://img.evbuc.com/moreStuff"
var+new_url+=+url.replace(/%5E([a-zA-Z][a-zA-Z0-9\.\%2B\-]*):\/\//,+"$1://www.")
console.log('new+URL:+',+new_url)|code-block|syntax|javascript|1148442|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>If you want something that will work with any protocol, try this regex: </p>

<pre><code>var url = "https://img.evbuc.com/moreStuff"
var new_url = url.replace(/^([a-zA-Z][a-zA-Z0-9\.\+\-]*):\/\//, "$1://www.")
console.log('new URL: ', new_url)
</code></pre>


<p>I am retrieving some data from an external API using javascript, I'm then displaying this data on a HTML page. </p>

<p>Within this returned data is a URL, it's in the following format;</p>

<pre><code>var url = https://img.evbuc.com/moreStuff
</code></pre>

<p>I need to rewrite this URL so that it's prefixed with <code>www</code>, like this;</p>

<pre><code>var url = https://www.img.evbuc.com/moreStuff
</code></pre>

<p>I want to achieve this using either javascript or jquery.</p>

<p>How can I achieve this? An explanation of the correct code would be great too.</p>


Rewrite URL Prefix Using Javascript / Jquery

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用javascript从外部API检索一些数据，然后将这些数据显示在HTML页面上。在这个返回的数据中是一个URL，它的格式如下；var url = https://img.evbuc.com/moreStuff我需要重写这个网址，使它以www为前缀，如下所示；var url = https://www.img...

问使用Javascript / Jquery重写URL前缀
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