如何从Node.js中的修改后的对象中获取价值

Question

how to get modified value of object? index.js is called before index2.js object.js

 var object = { size:'5' }; var setSize = function(size) { object.size = size; } exports.object = object; exports.setSize = setSize; 

index.js

 var obj = require('path/object'); obj.setSize('10'); console.log(obj.object.size); //--> 10 

index2.js I want the result to be 10.

 var obj = require('path/object'); console.log(obj.object.size); //--> 5 

Answer 1

If you run node index.js separately from node index2.js , there is no way for index2.js to "know" what happened in the last process of index.js . You have to apply all your actions in a single process run. As @Andrew Li stated in his comment, you would have to require index.js in your index2.js . Simply requiring it, will have it's code executed and the changes to obj.object will be saved in Nodes module caching mechanism.

var obj = require('path/object');
require('./index'); 
// code inside index.js gets executed, changing obj.size to '10'
// note that this will also log '10' in the console, since a console.log(obj.size)
// is part of your code in index.js


console.log(obj.object.size) //--> 10

If you need to have index.js and index2.js executed in different processes but still be able to access a coherent value of obj , you need to store that value somewhere outside of the process space, like in a database or in the filesystem.