betterInterval.js

// Better interval
var betterInterval = function (foo, timeout) {
	for (var i=2, extraArgs=[], that=this; i<arguments.length; i++)
		extraArgs.push (arguments[i]);

	var fooNext = function () {
		var args = extraArgs.slice();
		args.splice(0, 0, fooNext);
		for (var i=0; i<arguments.length; i++)
			args.push (arguments[i]);

		setTimeout (function () {
			foo.apply (that, args);
		}, timeout);
	};

	fooNext ();
};

// Example: interval with custom arguments.
(function () {
	var GM_xmlhttpRequest = function (opts) {
		console.log (opts.url);
		opts.onload ({response: ''});
	};
	betterInterval(function (doAgain, url, i) {
		// 初次调用
		if (isNaN (i))
			i = 0;

		GM_xmlhttpRequest({
			method: "GET",
			url: url + i,
			headers: {
				"User-Agent": "Mozilla/5.0",
				Accept: "text/xml"
			},
			onload: function(response) {
				msg_reply = response.responseText;
				if (++i < 10)
					doAgain (i);
			}
		});
	}, 1000, 'http://www.baidu.com/');
})();