javascript throttle

throttle.js

/**
* throttle 
* @param {fn} callback func   
* @param {wait} number - wait time
* @public
*/

function throttle(fn, wait) {
    var time = Date.now();
    return function() {
        if ((time + wait - Date.now()) < 0) {
            fn();
            time = Date.now();
        }
    }
}