函数节流

thottle.js

function highThottle(fn, content, mustTime, time) {
	var start = new Date();
	mustTime = mustTime || 5000;
	return function() {
		var args = arguments;
		clearTimeout(fn.timer);
		var end = new Date();
		if(end - start > mustTime) {
			start = new Date();
			clearTimeout(fn.timer);
			fn.apply(content, args);
		} else {
			fn.timer = setTimeout(function() {
				start = new Date();
				fn.apply(content, args);
			}, time || 200);
		}
	}
}