XStack

// 在没有jQuery的页面上快速插入jQuery
var s = document.createElement("script");
s.src = "http://cdn.bootcss.com/jquery/3.1.0/jquery.min.js";
document.body.appendChild(s);

var throttle = function(func, wait, options) {
    var getTime = function(){return new Date().getTime()};
    var context, args, result;
    var timeout = null;
    var previous = 0;
    if (!options) options = {};
    var later = function() {
        previous = options.leading === false ? 0 : getTime();
        timeout = null;
        result = func.apply(context, args);
        if (!timeout) context = args = null;
    };
    return function() {
        var now = getTime();
        if (!previous && options.leading === false) previous = now;
        var remaining = wait - (now - previous);
        context = this;
        args = arguments;
        if (remaining <= 0 || remaining > wait) {
            if (timeout) {
                clearTimeout(timeout);
                timeout = null;
            }
            previous = now;
            result = func.apply(context, args);
            if (!timeout) context = args = null;
        } else if (!timeout && options.trailing !== false) {
            timeout = setTimeout(later, remaining);
        }
        return result;
    };
};
var debounce = function(func, wait, immediate) {
    var timeout, args, context, timestamp, result;
    var later = function() {
        var last = new Date().getTime() - timestamp;
        if (last < wait && last >= 0) {
            timeout = setTimeout(later, wait - last);
        } else {
            timeout = null;
            if (!immediate) {
                result = func.apply(context, args);
                if (!timeout) context = args = null;
            }
        }
    };

    return function() {
        context = this;
        args = arguments;
        timestamp = new Date().getTime();
        var callNow = immediate && !timeout;
        if (!timeout) timeout = setTimeout(later, wait);
        if (callNow) {
            result = func.apply(context, args);
            context = args = null;
        }
        return result;
    };
};