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There are many template engines for nodejs, and EJS is relatively simple and easy to use. This article will introduce EJS in detail

Overview

EJS is a simple and efficient template language, through data and templates, you can generate HTML markup text. It can be said that EJS is a JavaScript library, EJS can be run on both the client side and the server side, the client side can be installed directly into the file, and the server side is installed with the npm package.

[installation]

Ejs can be used with express framework or directly in node / browser

$npm install ejs

[characteristics]

1. Compile and render quickly

2. Simple template tags

3. Custom tag delimiter

4. Support text inclusion

5. Support browser-side and server-side

6. Template static cache

7. Support express view system

Usage

Document var html = ejs.render ('',''); document.getElementById ('div1') [xss_clean] = html

Method

[ejs.compile (str, [option])]

Compile the string to get the template function with the following parameters

Str: string template to be parsed option: configuration options var template = ejs.compile (''); var result = template (); console.log (result); / / 123

[ejs.render (str,data, [option])]

Directly render the string and generate html. The parameters are as follows

Str: string template to be parsed data: data option: configuration option var result = ejs.render (''); console.log (result); / / 123

The configuration option parameter options included by the two functions is as follows:

Cache caches the compiled function (ejs.compile (..), which requires the filename parameter as the cached keyfilename for the cached key. And the execution context of the includecontext function compileDebug outputs the information of compile to trace the debug client returns the compiled function delimiter refers to the% debug output ejs.compile () here to get whether the function returned by the function body strict ejs.compile () is executed in strict mode _ with whether to use with () {.} to access the local variable localsName to save the object name of the local variable, the default is localsrmWhitespace to remove extra spaces

Commonly used label

[js]

All enclosed content will be compiled into Javascript and can be Coding like js in the template file.

/ / test.ejs//test.jsvar ejs = require ('ejs'); var fs = require (' fs'); var data = fs.readFileSync ('test.ejs'); var result = ejs.render (data.toString ()); console.log (result); / / 123

Or, write something like this

Var ejs = require ('ejs'); var result = ejs.render (''); console.log (result); / / 123

[variable]

With the output variable, the variable will be escaped if it contains characters such as'&'.

Var ejs = require ('ejs'); var result = ejs.render ('', {av é lange 123'}); console.log (result); / / 123

If you do not want the contents of the value of the variable to be escaped, use the output variable like this

Var ejs = require ('ejs'); var result = ejs.render ('', {av é lange 123'}); console.log (result); / / 123

[notes]

Used to comment, do not execute, do not output

[include]

Include can refer to template files with absolute or relative paths

/ / test.ejs//test.jsvar ejs = require ('ejs'); var result = ejs.render (''); / / throw new Error ('`roomde` use relative path requires the\' filename\ 'option.'); console.log (result)

As you can see from the above prompts, when using relative paths, the 'filename' option must be set

/ / test.ejs//test.jsvar ejs = require ('ejs'); var result = ejs.render ('', {filename:'test.ejs'}); console.log (result); / / 123

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