Node.js the method of calling JavaScript's Ejs Template Library in a project _node.js

As an external module, the method invoked is the same as the MySQL module, and is no longer to repeat.

Ejs's render function has two arguments. The first is a string, the second is an optional object, and the data that needs to be rendered as other JavaScript templates is included in the option object

Ejs.render (str,option); 
Render string str typically reads the 
ejs.render (str,{ 
  data:user_data//required render data}) through the ReadFile method of the Nodejs file system 
; 

When an include tag is not included in the STR string, rendering data is not problematic, and conversely, an error is encountered. I've already mentioned that my project file and the Nodejs installation file are not in the same root directory. To resolve this issue, configure the filename attribute of the option parameter.

Looking at the Ejs source, you will find that Ejs uses a resolveinclude function when dealing with the path to the include include file:

function resolveinclude (name, filename) { 
 var path = join (dirname (filename), name); 
 var ext = extname (name); 
 if (!ext) path = '. Ejs '; 
 return path; 
} 

FileName is precisely the parameter of the DirName function, as the path.dirname () of the Nodejs core module, the path returned is always relative to the Nodejs installation path, and if no filename value is specified, the file cannot be found
When using dirname, it should be noted that when a function processes an incoming path parameter, it intercepts the first
The section before '/' as a path name for example:

Path.dirname ('/foo/bar/baz/asdf/quux ') 
//returns 
'/FOO/BAR/BAZ/ASDF ' 

To obtain the TPL directory you can write this:

Path.dirname ('/tpl/. ')//RETURN/TPL 

The complete render function can be this way:

Ejs.render (str,{ 
  filename:path + '/tpl/... ',//TPL file is saved in template file 
  data:user_data 
});