NodeJS：如何在不使用require的情况下包含一些javascript代码段？

Question

I wanted to include some js files without using require because it would link it to a variable, and i have some functions i would like to call directly. how can i do it ? is it bad practice ?

what i want to avoid is this: let's say i have tool.js as follow:

function foo() {
    log.debug("foo");
}    
exports.foo = foo;

in app.js

var tool= require('tools.js');

tool.foo();

i would like to be able to call foo without creating a module for it as if it was define in app.js; like so

foo();

Answer 1

You can require a file and use its functions without assigning it to a variable by using the global object.

file1.js

function logger(){
    console.log(arguments);
}

global.logger = logger;

file2.js

require('./file1');

logger('ABC');

This approach would get rid of variable scoping and would pollute the global namespace potentially leading to clashes with variable naming.

Answer 2

You need to use global like this,

======= app.js ======

global.foo= require('tools.js'); // declare as global
foo(); // can be called from all files