Why is my `setTimeout` function call executing immediately?

Why is my function call scheduled by setTimeout executed immediately?

In an attempt to test proxy servers, a function titled crawl() has been devised. The objective is for this function to invoke doRequest() at intervals of roughly 10 seconds. However, despite employing setTimeout(), the function is being called immediately.

To remedy this, there are three viable solutions:

• Alter the order of arguments:

  setTimeout(doRequest, proxytimeout, url, proxys[proxy]);

• Use an evaluable string:

  setTimeout('doRequest('+url+','+proxys[proxy]+')', proxytimeout);

• Pass an anonymous function:

  (function(u, p, t) {
    setTimeout(function() { doRequest(u, p); }, t);
  })(url, proxys[proxy], proxytimeout);

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