Tasks for building web programs using GruntJS_node.js

How to customize Grunt tasks

Sometimes we need to write some of our own grunt tasks, here is a specific example

1. Preparation

1. Create a new directory g1
2. Create a new package.json and put it in g1
3. Create a new Gruntfile.js and put it in g1

package.json

Copy code The code is as follows:

{
"name": "g1",
"version": "0.1.0",
"author": "@snandy",
"homepage": "http://www.g1.com",
"devDependencies" : {
"grunt": "~0.4.0"
}
}

4. cd into g1, npm install to install the grunt package

The entire directory structure is as follows

Gruntfile.js is temporarily empty.

2. Create the simplest task

grunt.registerTask(taskName, [description,] taskFunction)

taskName task name, use grunt in the command line taskName
description description of the task
taskFunction implementation of the task

Fill in the code in Gruntfile.js

Copy code The code is as follows:

module.exports = function(grunt) {
grunt.registerTask('mytask', 'A simplest task demonstration, print different outputs according to parameters.', function(arg1, arg2) {
                                                                                                                              .log.writeln('Task' this.name ", no parameters passed");
        } else if (arguments.length === 1) {
          grunt.log.writeln('Task' this.name ", one parameter is " arg1);
    } else {
          grunt.log.writeln('task' this.name ", there are two parameters are " arg1 ", " arg2);
}
});
};

Registered a task "mytask" to implement the simplest way to achieve different print outputs based on different passed parameters. To see the running results, we need to enter the command line.

Go to the g1 directory and enter grunt mytask

Enter grunt mytask:snandy

Add a colon after the task name to pass parameters

Enter grunt mytask:snandy:backus

You can pass multiple parameters separated by colon

3. Create multiple tasks at one time

grunt.registerMultiTask(taskName, [description,] taskFunction)

You can see that the parameters are the same but the method names are different. But the usage method is different. You need to initialize the config first. Gruntfile.js is as follows

Copy code The code is as follows:

module.exports = function(grunt) {
grunt.initConfig({
log: {
t1: [1, 2, 3],
t2: 'hello world',
t3: false
}
});

grunt.registerMultiTask('log', 'Log stuff.', function() {
grunt.log.writeln(this.target ': ' this.data);
});
};

Enter the g1 directory and test separately

Enter grunt, and three subtasks t1, t2, t3 will be executed in sequence

Enter grunt log:t1, grunt log:t2, grunt log:t3 respectively

4. Communication between tasks

You can call another task within a task, as follows

Copy code The code is as follows:

module.exports = function(grunt) {

grunt.registerTask('mytask', 'The simplest task demonstration, printing different outputs according to parameters.', function(arg1, arg2) {
if (arguments.length === 0) {
grunt.log.writeln('task' this.name ", no parameters passed");
} else if (arguments.length === 1) {
         grunt.log.writeln('Task' this.name ", one parameter is " arg1); .name ", there are two parameters: " arg1 ", " arg2);
      }
  });

grunt.registerTask('default', 'Default task', function( ) {
                                                                                                                                                                                                                                                                                                  
Enter the command line and type grunt




To call multiple tasks, just pass them to the run method separated by commas, or in array form

Copy code

The code is as follows:

grunt.registerTask('default', 'Default task ', function() { grunt.task.run('mytask1', 'mytask2') // or grunt.task.run(['mytask1', 'mytask2']) })