Similar to Magic Constants in PHP. Useful for debugging.
以为考虑到使用V8引擎的Error.prepareStackTrace API会耗费V8的性能，测试调用此API耗时1毫秒， 而且有可能导致内存溢出，或者引起其他不好的后果，导致系统运行不稳定，生产环境时MODEL就设置成 生产模式。所以就添加了模式，有生产模式和调试模式，默认是调试模式通过setModel设置
var magic = require(magic-globals);
magic.setModel(magic.DEBUG_MODEL);
magic.setModel(magic.PRODUCTION_MODEL);
// require this module without assigning export
require('magic-globals');
// you may now use additional global objects,
// in addition to built-ins: __filename and __dirname
console.log(__filename); // /home/node/myapp/server/server.js
console.log(__file); // server
console.log(__line); // 6
console.log(__fili); // /home/node/myapp/server/server.js:6
console.log(__ext); // js
console.log(__base); // /home/node/myapp
console.log(__func); // someFunction or (anonymous)
console.log(__dirname); // /home/node/myapp/serverThese sources have helped to create this module by sharing their code:
- http://stackoverflow.com/questions/13591785/does-node-js-have-anything-like-file-and-line-like-the-c-preprocessor
- http://stackoverflow.com/questions/11386492/accessing-line-number-in-v8-javascript-chrome-node-js
- https://gist.github.com/lordvlad/ec81834ddff73aaa1ab0
These are alternative projects which can yield achieve a similar result:
- https://www.npmjs.com/package/nor-debug
- https://www.npmjs.com/package/pitestglobals
- https://www.npmjs.com/package/magicmethods
(The MIT License) Copyright (c) 2015 Gavin Engel <[email protected]>