blocks|key|1894690|text|从node版本0.12.0开始，您可以使用path模块中的path.isAbsolute(path)函数。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1894691|即：|1894692|var+path+=+require('path');
if(path.isAbsolute(myPath))+{
++++//...
}|code-block|syntax|javascript|1894693|entityMap|0|LINK|mutability|MUTABLE|url|https://nodejs.org/api/path.html|1|https://nodejs.org/api/path.html#path_path_isabsolute_path^0|T|L|L|4|0|T|L|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]|$9|12|A|13|1|14]]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

Since node version 0.12.0 you can use the <a href="https://nodejs.org/api/path.html#path_path_isabsolute_path" rel="noreferrer"><code>path.isAbsolute(path)</code></a> function from the <a href="https://nodejs.org/api/path.html" rel="noreferrer">path</a> module.

i.e:

<pre><code>var path = require('path');
if(path.isAbsolute(myPath)) {
 //...
}
</code></pre>

blocks|key|1680729|text|你可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1680730|path.resolve(yourPath)===yourPath|code-block|syntax|javascript|1680731|如果您的路径未标准化，请使用|1680732|path.resolve(+yourPath+)+==+path.normalize(+yourPath+)|1680733|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You could use

<pre><code>path.resolve(yourPath)===yourPath
</code></pre>

If your path isn't normalized, use 

<pre><code>path.resolve( yourPath ) == path.normalize( yourPath )
</code></pre>

blocks|key|1680855|text|正如对dystroy的回答所评论的那样，如果绝对路径尚未标准化(例如，路径：///a//..//b//./)，则所提出的解决方案不起作用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1680856|正确的解决方案是：|1680857|path.resolve(yourPath)+===+path.normalize(yourPath)|code-block|syntax|javascript|1680858|1680859|正如Marc+Diethelm在评论中建议的那样，这仍然存在一些问题，因为path.resolve删除了尾部斜杠，而path.normalize没有。|1680860|我不确定这些函数到底是如何运行的(你可以在评论中看到)，不管怎么说，下面的代码片段看起来至少在Linux环境下工作得很好：|1680861|path.resolve(yourPath)+===+path.normalize(yourPath).replace(+RegExp(path.sep%2B'$'),+''+);|1680862|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/546491/marc-diethelm^0|12|F|0|0|0|0|11|C|1M|E|2|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|P|3|Q|5|6|7|1F|8|@]|D|@]|E|$]]|$1|R|3|S|5|J|7|1G|8|@]|D|@]|E|$K|L]]|$1|T|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|U|$V|$5|W|X|Y|E|$Z|10]]]]

As commented to dystroy's answer, the proposed solutions don't work if an absolute path is not already normalized (for example the path: <code>///a//..//b//./</code>).

A correct solution is:

<pre><code>path.resolve(yourPath) === path.normalize(yourPath)
</code></pre>

<hr>

As <a href="https://stackoverflow.com/users/546491/marc-diethelm">Marc Diethelm</a> suggests in the comments, this has still some issues, since <code>path.resolve</code> removes trailing slashes while <code>path.normalize</code> doesn't.

I'm not sure how these function exactly behave (as you can read in the comments), anyway the following snippet seem to work fine at least in Linux environments:

<pre><code>path.resolve(yourPath) === path.normalize(yourPath).replace( RegExp(path.sep+'$'), '' );
</code></pre>

blocks|key|1680968|text|这有点复杂，但这是我使用(pre+node+0.12.0)+path模块找到的最健壮的方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1680969|function+isAbsolute(p)+{
++++return+path.normalize(p+%2B+'/')+===+path.normalize(path.resolve(p)+%2B+'/');
}|code-block|syntax|javascript|1680970|应该注意，path.isAbsolute从节点0.12.0开始存在。|1680971|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is a little convoluted, but the most robust way I've found using just the (pre node 0.12.0) path module

<pre><code>function isAbsolute(p) {
 return path.normalize(p + '/') === path.normalize(path.resolve(p) + '/');
}
</code></pre>

It should be noted that path.isAbsolute exists from node 0.12.0 onwards.

blocks|key|1894500|text|我对node.js一无所知，但是你可以在github中看到path.js的源代码：https://github.com/joyent/node/blob/master/lib/path.js|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1894501|您可以看到：|1894502|//+windows+version
exports.isAbsolute+=+function(path)+{
++++var+result+=+splitDeviceRe.exec(path),
++++device+=+result[1]+%7C%7C+'',
++++isUnc+=+device+&&+device.charAt(1)+!==+':';
++++//+UNC+paths+are+always+absolute
++++return+!!result[2]+%7C%7C+isUnc;
};|code-block|syntax|javascript|1894503|和：|1894504|//+posix+version
exports.isAbsolute+=+function(path)+{
++++return+path.charAt(0)+===+'/';
};|1894505|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/joyent/node/blob/master/lib/path.js^0|15|1I|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

I have no idea about node.js, but you can see the source of path.js in github:
<a href="https://github.com/joyent/node/blob/master/lib/path.js" rel="nofollow">https://github.com/joyent/node/blob/master/lib/path.js</a>

You can see:

<pre><code>// windows version
exports.isAbsolute = function(path) {
 var result = splitDeviceRe.exec(path),
 device = result[1] || '',
 isUnc = device &amp;&amp; device.charAt(1) !== ':';
 // UNC paths are always absolute
 return !!result[2] || isUnc;
};
</code></pre>

And: 

<pre><code>// posix version
exports.isAbsolute = function(path) {
 return path.charAt(0) === '/';
};
</code></pre>

blocks|key|1894721|text|++++isRelative(url){
++++++++return+(/%5E(\.){1,2}(\/){1,2}$/.test(url.slice(0,3))+%7C%7C
++++++++/(\/){1,2}(\.){1,2}(\/){1,2}/.test(url));+
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1894722|这使得即使缺少节点路径模块API也很容易检查路径是否是相对的。|unstyled|1894723|(/%5E(\.%7C~){1,2}(\/){1,2}$/.test(url.slice(0,3))|1894724|此部分检查路径字符串是否以"./“、"../”或"~/“开头。如果是，则返回布尔值true。否则，将执行下一个测试。|1894725|/(\/){1,2}(\.){1,2}(\/){1,2}/.test(url)|1894726|这只检查路径字符串是否包含"/./“或"/../”。并对any返回true，对两者都返回false。|1894727|如果两个测试中的任何一个为真，则路径字符串是相对的。|1894728|用于windows。|1894729|++++isRelative(url){
++++++++return+(/%5E(\.){1,2}(\\){1,2}$/.test(url.slice(0,3))+%7C%7C
++++++++/(\\){1,2}(\.){1,2}(\\){1,2}/.test(url));+
++++}|1894730|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$B|C]]|$1|U|3|-4|5|F|7|15|8|@]|9|@]|A|$]]]|V|$]]

<pre><code> isRelative(url){
 return (/^(\.){1,2}(\/){1,2}$/.test(url.slice(0,3)) ||
 /(\/){1,2}(\.){1,2}(\/){1,2}/.test(url)); 
 }
</code></pre>

This makes it easy to check whether a path is relative despite of absence of node path module API. 

<pre><code>(/^(\.|~){1,2}(\/){1,2}$/.test(url.slice(0,3))
</code></pre>

this part checks if the path string starts with the "./" or "../" or "~/". 
If it does, Boolean true is returned. Otherwise the next test is executed.

<pre><code>/(\/){1,2}(\.){1,2}(\/){1,2}/.test(url)
</code></pre>

This just checks if the path string has either "/./" or "/../". and returns true on any and false on neither. 

If any of the two tests is true then the path string is relative. 

For windows. 

<pre><code> isRelative(url){
 return (/^(\.){1,2}(\\){1,2}$/.test(url.slice(0,3)) ||
 /(\\){1,2}(\.){1,2}(\\){1,2}/.test(url)); 
 }
</code></pre>

UNIX absolute path starts with '/', whereas Windows starts with alphabet 'C:' or '\'. Does node.js has a standard multiplatform function to check if a path is absolute or relative ?

How to check if a path is absolute or relative

Windows

Linux

UNIX绝对路径以'/‘开头，而Windows以字母'C:’或'\‘开头。node.js有没有一个标准的多平台功能来检查路径是绝对的还是相对的？

问如何检查路径是绝对路径还是相对路径
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