方法说明:
获取真实路径。
可以使用process.cwd解决相对路径。
语法:
代码如下:
由于该方法属于fs模块,使用前需要引入fs模块(var fs= require(“fs”) )
接收参数:
path 路径
cache 可选,一个文字的映射路径可用于强制一个特定的路径解决或避免额外的fs.stat需要知道真正的路径对象。
callback 回调
err 异常
resolvedPath 真实地址
例子:
代码如下:
源码:
代码如下:
= p.length) {
if (cache) cache[original] = p;
return cb(null,p);
}
// find the next part
nextPartRe.lastIndex = pos;
var result = nextPartRe.exec(p);
prevIoUs = current;
current += result[0];
base = prevIoUs + result[1];
pos = nextPartRe.lastIndex;
// continue if not a symlink
if (knownHard[base] || (cache && cache[base] === base)) {
return process.nextTick(LOOP);
}
if (cache && Object.prototype.hasOwnProperty.call(cache,base)) {
// known symbolic link. no need to stat again.
return gotResolvedLink(cache[base]);
}
return fs.lstat(base,gotStat);
}
function gotStat(err,stat) {
if (err) return cb(err);
// if not a symlink,skip to the next path part
if (!stat.isSymbolicLink()) {
knownHard[base] = true;
if (cache) cache[base] = base;
return process.nextTick(LOOP);
}
// stat & read the link if not read before
// call gotTarget as soon as the link target is known
// dev/ino always return 0 on windows,so skip the check.
if (!isWindows) {
var id = stat.dev.toString(32) + ':' + stat.ino.toString(32);
if (seenLinks.hasOwnProperty(id)) {
return gotTarget(null,seenLinks[id],base);
}
}
fs.stat(base,function(err) {
if (err) return cb(err);
fs.readlink(base,function(err,target) {
if (!isWindows) seenLinks[id] = target;
gotTarget(err,target);
});
});
}
function gotTarget(err,target,base) {
if (err) return cb(err);
var resolvedLink = pathModule.resolve(prevIoUs,target);
if (cache) cache[base] = resolvedLink;
gotResolvedLink(resolvedLink);
}
function gotResolvedLink(resolvedLink) {
// resolve the link,then start over
p = pathModule.resolve(resolvedLink,p.slice(pos));
start();
}
};
原文链接:https://www.f2er.com/nodejs/56894.html