setTimeout不能与Node.js中的Monq一起使用

Question

While attempting to use setTimeout to perform rate limiting on a monq worker, why is the worker not being throttled?

worker does not wait for 10 seconds before executing setTimeout() . Why is this and how can we get it to delay the call to foo() ?

var monq = require('monq')
var client = monq('localhost/mydb')
var worker = client.worker(['general'])
worker.register({
    test: function(params, callback) {
        try {
            setTimeout(foo(params, callback), 10000)
        } catch(err) {
            callback(err)
        }
    }
})

foo = function(params, callback) {
    console.log('Hello world')
    callback()
}

Answer 1

Because setTimeout expects a function reference. Instead, you're executing the function and passing the result to setTimeout .

Use:

setTimeout(function() {
    foo(params, callback);
}, 10000);

Also, the try/catch block is somewhat redundant there, because the call to setTimeout won't throw an exception. Instead, you would need to handle it inside foo .