node.js中的path.join方法使用说明

方法说明：
将多个参数组合成一个 path （详细请看例子）
语法：
复制代码代码如下:
path.join（[path1], [path2], [...]）

由于该方法属于path模块，使用前需要引入path模块（var path= require（“path”））
例子：
复制代码代码如下:
path.join（"/foo", "bar", "baz/asdf", "quux", ".."）
// returns
"/foo/bar/baz/asdf"
path.join（"foo", {}, "bar"）
// throws exception
TypeError: Arguments to path.join must be strings

源码：
复制代码代码如下:
// windows version
exports.join = function（） {
    function f（p） {
      if （！util.isString（p）） {
        throw new TypeError（"Arguments to path.join must be strings"）;
      }
      return p;
    }

    var paths = Array.prototype.filter.call（arguments, f）;
    var joined = paths.join（"\"）;

    // Make sure that the joined path doesn"t start with two slashes, because
    // normalize（） will mistake it for an UNC path then.
    //
    // This step is skipped when it is very clear that the user actually
    // intended to point at an UNC path. This is assumed when the first
    // non-empty string arguments starts with exactly two slashes followed by
    // at least one more non-slash character.
    //
    // Note that for normalize（） to treat a path as an UNC path it needs to
    // have at least 2 components, so we don"t filter for that here.
    // This means that the user can use join to construct UNC paths from
    // a server name and a share name; for example:
    // path.join（"//server", "share"） -> "\\server\share"）
    if （！/^[\/]{2}[^\/]/.test（paths[0]）） {
      joined = joined.replace（/^[\/]{2,}/, "\"）;
    }

    return exports.normalize（joined）;
};