nodejs module 热更新

_require.js

/*
    require -> Module.prototype.require -> Module.load(request,module)

    require.reslove -> Module._resolveFilename(request, module);
*/


var Module = module.constructor

Module.prototype._require = function(request) {
    var res = this.require(request)

    // delete cache
    var filename = Module._resolveFilename(request, this);
    delete Module._cache[filename]

    return res;
};

demo.js

require('./_require')

var timer = setInterval(function() {
    console.log(module._require("./test"));
},1000)

setTimeout(function() {
    timer.unref()
}, 1000 * 30);

test_module.js

// 修改module.exports 看输出

module.exports = 100