网页顶部加载进度条，跟随网页加载完自动消失
如图：
代码如下
css:
.pace {
-webkit-pointer-events:none;
pointer-events:none;
-webkit-user-select:none;
-moz-user-select:none;
user-select:none;
}
.pace-inactive {
display:none;/*此段代码进度条跑完后隐藏*/
}
.pace .pace-progress {
background:#ff0000;/*进度条颜色*/
position:fixed;
z-index:2000;
top:0;
left:0;/*进度条开始位置*/
height:3px;/*进度条高度（宽度）*/
-webkit-transition:width 0.1s;
-moz-transition:width 0.1s;
-o-transition:width 0.1s;
transition:width 0.1s;
}
js：
(function() {
var AjaxMonitor, Bar, DocumentMonitor, ElementMonitor, ElementTracker, EventLagMonitor, Evented, Events, NoTargetError, RequestIntercept, SOURCE_KEYS, Scaler, SocketRequestTracker, XHRRequestTracker, animation, avgAmplitude, bar, cancelAnimation, cancelAnimationFrame, defaultOptions, extend, extendNative, getFromDOM, getIntercept, handlePushState, ignoreStack, init, now, options, requestAnimationFrame, result, runAnimation, scalers, shouldIgnoreURL, shouldTrack, source, sources, uniScaler, _WebSocket, _XDomainRequest, _XMLHttpRequest, _i, _intercept, _len, _pushState, _ref, _ref1, _replaceState, __slice = [].slice,
__hasProp = {}.hasOwnProperty,
__extends = function(child, parent) {
for (var key in parent) {
if (__hasProp.call(parent, key)) {
child[key] = parent[key]
}
}
function ctor() {
this.constructor = child
}
ctor.prototype = parent.prototype;
child.prototype = new ctor();
child.__super__ = parent.prototype;
return child
},
__indexOf = [].indexOf ||
function(item) {
for (var i = 0,
l = this.length; i < l; i++) {
if (i in this && this[i] === item) {
return i
}
}
return - 1
};
defaultOptions = {
catchupTime: 500,
initialRate: 0.03,
minTime: 500,
ghostTime: 500,
maxProgressPerFrame: 10,
easeFactor: 1.25,
startOnPageLoad: true,
restartOnPushState: true,
restartOnRequestAfter: 500,
target: "body",
elements: {
checkInterval: 100,
selectors: ["body"]
},
eventLag: {
minSamples: 10,
sampleCount: 3,
lagThreshold: 3
},
ajax: {
trackMethods: ["GET"],
trackWebSockets: true,
ignoreURLs: []
}
};
now = function() {
var _ref;
return (_ref = typeof performance !== "undefined" && performance !== null ? typeof performance.now === "function" ? performance.now() : void 0 : void 0) != null ? _ref: +(new Date)
};
requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame;
if (requestAnimationFrame == null) {
requestAnimationFrame = function(fn) {
return setTimeout(fn, 50)
};
cancelAnimationFrame = function(id) {
return clearTimeout(id)
}
}
runAnimation = function(fn) {
var last, tick;
last = now();
tick = function() {
var diff;
diff = now() - last;
if (diff >= 33) {
last = now();
return fn(diff,
function() {
return requestAnimationFrame(tick)
})
} else {
return setTimeout(tick, 33 - diff)
}
};
return tick()
};
result = function() {
var args, key, obj;
obj = arguments[0],
key = arguments[1],
args = 3 <= arguments.length ? __slice.call(arguments, 2) : [];
if (typeof obj[key] === "function") {
return obj[key].apply(obj, args)
} else {
return obj[key]
}
};
extend = function() {
var key, out, source, sources, val, _i, _len;
out = arguments[0],
sources = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
for (_i = 0, _len = sources.length; _i < _len; _i++) {
source = sources[_i];
if (source) {
for (key in source) {
if (!__hasProp.call(source, key)) {
continue
}
val = source[key];
if ((out[key] != null) && typeof out[key] === "object" && (val != null) && typeof val === "object") {
extend(out[key], val)
} else {
out[key] = val
}
}
}
}
return out
};
avgAmplitude = function(arr) {
var count, sum, v, _i, _len;
sum = count = 0;
for (_i = 0, _len = arr.length; _i < _len; _i++) {
v = arr[_i];
sum += Math.abs(v);
count++
}
return sum / count
};
getFromDOM = function(key, json) {
var data, e, el;
if (key == null) {
key = "options"
}
if (json == null) {
json = true
}
el = document.querySelector("[data-pace-" + key + "]");
if (!el) {
return
}
data = el.getAttribute("data-pace-" + key);
if (!json) {
return data
}
try {
return JSON.parse(data)
} catch(_error) {
e = _error;
return typeof console !== "undefined" && console !== null ? console.error("Error parsing inline pace options", e) : void 0
}
};
Evented = (function() {
function Evented() {}
Evented.prototype.on = function(event, handler, ctx, once) {
var _base;
if (once == null) {
once = false
}
if (this.bindings == null) {
this.bindings = {}
}
if ((_base = this.bindings)[event] == null) {
_base[event] = []
}
return this.bindings[event].push({
handler: handler,
ctx: ctx,
once: once
})
};
Evented.prototype.once = function(event, handler, ctx) {
return this.on(event, handler, ctx, true)
};
Evented.prototype.off = function(event, handler) {
var i, _ref, _results;
if (((_ref = this.bindings) != null ? _ref[event] : void 0) == null) {
return
}
if (handler == null) {
return delete this.bindings[event]
} else {
i = 0;
_results = [];
while (i < this.bindings[event].length) {
if (this.bindings[event][i].handler === handler) {
_results.push(this.bindings[event].splice(i, 1))
} else {
_results.push(i++)
}
}
return _results
}
};
Evented.prototype.trigger = function() {
var args, ctx, event, handler, i, once, _ref, _ref1, _results;
event = arguments[0],
args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
if ((_ref = this.bindings) != null ? _ref[event] : void 0) {
i = 0;
_results = [];
while (i < this.bindings[event].length) {
_ref1 = this.bindings[event][i],
handler = _ref1.handler,
ctx = _ref1.ctx,
once = _ref1.once;
handler.apply(ctx != null ? ctx: this, args);
if (once) {
_results.push(this.bindings[event].splice(i, 1))
} else {
_results.push(i++)
}
}
return _results
}
};
return Evented
})();
if (window.Pace == null) {
window.Pace = {}
}
extend(Pace, Evented.prototype);
options = Pace.options = extend({},
defaultOptions, window.paceOptions, getFromDOM());
_ref = ["ajax", "document", "eventLag", "elements"];
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
source = _ref[_i];
if (options[source] === true) {
options[source] = defaultOptions[source]
}
}
NoTargetError = (function(_super) {
__extends(NoTargetError, _super);
function NoTargetError() {
_ref1 = NoTargetError.__super__.constructor.apply(this, arguments);
return _ref1
}
return NoTargetError
})(Error);
Bar = (function() {
function Bar() {
this.progress = 0
}
Bar.prototype.getElement = function() {
var targetElement;
if (this.el == null) {
targetElement = document.querySelector(options.target);
if (!targetElement) {
throw new NoTargetError
}
this.el = document.createElement("div");
this.el.className = "pace pace-active";
document.body.className = document.body.className.replace(/pace-done/g, "");
document.body.className += " pace-running";
this.el.innerHTML = '<div class="pace-progress">\n <div class="pace-progress-inner"></div>\n</div>\n<div class="pace-activity"></div>';
if (targetElement.firstChild != null) {
targetElement.insertBefore(this.el, targetElement.firstChild)
} else {
targetElement.appendChild(this.el)
}
}
return this.el
};
Bar.prototype.finish = function() {
var el;
el = this.getElement();
el.className = el.className.replace("pace-active", "");
el.className += " pace-inactive";
document.body.className = document.body.className.replace("pace-running", "");
return document.body.className += " pace-done"
};
Bar.prototype.update = function(prog) {
this.progress = prog;
return this.render()
};
Bar.prototype.destroy = function() {
try {
this.getElement().parentNode.removeChild(this.getElement())
} catch(_error) {
NoTargetError = _error
}
return this.el = void 0
};
Bar.prototype.render = function() {
var el, progressStr;
if (document.querySelector(options.target) == null) {
return false
}
el = this.getElement();
el.children[0].style.width = "" + this.progress + "%";
if (!this.lastRenderedProgress || this.lastRenderedProgress | 0 !== this.progress | 0) {
el.children[0].setAttribute("data-progress-text", "" + (this.progress | 0) + "%");
if (this.progress >= 100) {
progressStr = "99"
} else {
progressStr = this.progress < 10 ? "0": "";
progressStr += this.progress | 0
}
el.children[0].setAttribute("data-progress", "" + progressStr)
}
return this.lastRenderedProgress = this.progress
};
Bar.prototype.done = function() {
return this.progress >= 100
};
return Bar
})();
Events = (function() {
function Events() {
this.bindings = {}
}
Events.prototype.trigger = function(name, val) {
var binding, _j, _len1, _ref2, _results;
if (this.bindings[name] != null) {
_ref2 = this.bindings[name];
_results = [];
for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
binding = _ref2[_j];
_results.push(binding.call(this, val))
}
return _results
}
};
Events.prototype.on = function(name, fn) {
var _base;
if ((_base = this.bindings)[name] == null) {
_base[name] = []
}
return this.bindings[name].push(fn)
};
return Events
})();
_XMLHttpRequest = window.XMLHttpRequest;
_XDomainRequest = window.XDomainRequest;
_WebSocket = window.WebSocket;
extendNative = function(to, from) {
var e, key, val, _results;
_results = [];
for (key in from.prototype) {
try {
val = from.prototype[key];
if ((to[key] == null) && typeof val !== "function") {
_results.push(to[key] = val)
} else {
_results.push(void 0)
}
} catch(_error) {
e = _error
}
}
return _results
};
ignoreStack = [];
Pace.ignore = function() {
var args, fn, ret;
fn = arguments[0],
args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
ignoreStack.unshift("ignore");
ret = fn.apply(null, args);
ignoreStack.shift();
return ret
};
Pace.track = function() {
var args, fn, ret;
fn = arguments[0],
args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
ignoreStack.unshift("track");
ret = fn.apply(null, args);
ignoreStack.shift();
return ret
};
shouldTrack = function(method) {
var _ref2;
if (method == null) {
method = "GET"
}
if (ignoreStack[0] === "track") {
return "force"
}
if (!ignoreStack.length && options.ajax) {
if (method === "socket" && options.ajax.trackWebSockets) {
return true
} else {
if (_ref2 = method.toUpperCase(), __indexOf.call(options.ajax.trackMethods, _ref2) >= 0) {
return true
}
}
}
return false
};
RequestIntercept = (function(_super) {
__extends(RequestIntercept, _super);
function RequestIntercept() {
var monitorXHR, _this = this;
RequestIntercept.__super__.constructor.apply(this, arguments);
monitorXHR = function(req) {
var _open;
_open = req.open;
return req.open = function(type, url, async) {
if (shouldTrack(type)) {
_this.trigger("request", {
type: type,
url: url,
request: req
})
}
return _open.apply(req, arguments)
}
};
window.XMLHttpRequest = function(flags) {
var req;
req = new _XMLHttpRequest(flags);
monitorXHR(req);
return req
};
try {
extendNative(window.XMLHttpRequest, _XMLHttpRequest)
} catch(_error) {}
if (_XDomainRequest != null) {
window.XDomainRequest = function() {
var req;
req = new _XDomainRequest;
monitorXHR(req);
return req
};
try {
extendNative(window.XDomainRequest, _XDomainRequest)
} catch(_error) {}
}
if ((_WebSocket != null) && options.ajax.trackWebSockets) {
window.WebSocket = function(url, protocols) {
var req;
if (protocols != null) {
req = new _WebSocket(url, protocols)
} else {
req = new _WebSocket(url)
}
if (shouldTrack("socket")) {
_this.trigger("request", {
type: "socket",
url: url,
protocols: protocols,
request: req
})
}
return req
};
try {
extendNative(window.WebSocket, _WebSocket)
} catch(_error) {}
}
}
return RequestIntercept
})(Events);
_intercept = null;
getIntercept = function() {
if (_intercept == null) {
_intercept = new RequestIntercept
}
return _intercept
};
shouldIgnoreURL = function(url) {
var pattern, _j, _len1, _ref2;
_ref2 = options.ajax.ignoreURLs;
for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
pattern = _ref2[_j];
if (typeof pattern === "string") {
if (url.indexOf(pattern) !== -1) {
return true
}
} else {
if (pattern.test(url)) {
return true
}
}
}
return false
};
getIntercept().on("request",
function(_arg) {
var after, args, request, type, url;
type = _arg.type,
request = _arg.request,
url = _arg.url;
if (shouldIgnoreURL(url)) {
return
}
if (!Pace.running && (options.restartOnRequestAfter !== false || shouldTrack(type) === "force")) {
args = arguments;
after = options.restartOnRequestAfter || 0;
if (typeof after === "boolean") {
after = 0
}
return setTimeout(function() {
var stillActive, _j, _len1, _ref2, _ref3, _results;
if (type === "socket") {
stillActive = request.readyState < 2
} else {
stillActive = (0 < (_ref2 = request.readyState) && _ref2 < 4)
}
if (stillActive) {
Pace.restart();
_ref3 = Pace.sources;
_results = [];
for (_j = 0, _len1 = _ref3.length; _j < _len1; _j++) {
source = _ref3[_j];
if (source instanceof AjaxMonitor) {
source.watch.apply(source, args);
break
} else {
_results.push(void 0)
}
}
return _results
}
},
after)
}
});
AjaxMonitor = (function() {
function AjaxMonitor() {
var _this = this;
this.elements = [];
getIntercept().on("request",
function() {
return _this.watch.apply(_this, arguments)
})
}
AjaxMonitor.prototype.watch = function(_arg) {
var request, tracker, type, url;
type = _arg.type,
request = _arg.request,
url = _arg.url;
if (shouldIgnoreURL(url)) {
return
}
if (type === "socket") {
tracker = new SocketRequestTracker(request)
} else {
tracker = new XHRRequestTracker(request)
}
return this.elements.push(tracker)
};
return AjaxMonitor
})();
XHRRequestTracker = (function() {
function XHRRequestTracker(request) {
var event, size, _j, _len1, _onreadystatechange, _ref2, _this = this;
this.progress = 0;
if (window.ProgressEvent != null) {
size = null;
request.addEventListener("progress",
function(evt) {
if (evt.lengthComputable) {
return _this.progress = 100 * evt.loaded / evt.total
} else {
return _this.progress = _this.progress + (100 - _this.progress) / 2
}
});
_ref2 = ["load", "abort", "timeout", "error"];
for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
event = _ref2[_j];
request.addEventListener(event,
function() {
return _this.progress = 100
})
}
} else {
_onreadystatechange = request.onreadystatechange;
request.onreadystatechange = function() {
var _ref3;
if ((_ref3 = request.readyState) === 0 || _ref3 === 4) {
_this.progress = 100
} else {
if (request.readyState === 3) {
_this.progress = 50
}
}
return typeof _onreadystatechange === "function" ? _onreadystatechange.apply(null, arguments) : void 0
}
}
}
return XHRRequestTracker
})();
SocketRequestTracker = (function() {
function SocketRequestTracker(request) {
var event, _j, _len1, _ref2, _this = this;
this.progress = 0;
_ref2 = ["error", "open"];
for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
event = _ref2[_j];
request.addEventListener(event,
function() {
return _this.progress = 100
})
}
}
return SocketRequestTracker
})();
ElementMonitor = (function() {
function ElementMonitor(options) {
var selector, _j, _len1, _ref2;
if (options == null) {
options = {}
}
this.elements = [];
if (options.selectors == null) {
options.selectors = []
}
_ref2 = options.selectors;
for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
selector = _ref2[_j];
this.elements.push(new ElementTracker(selector))
}
}
return ElementMonitor
})();
ElementTracker = (function() {
function ElementTracker(selector) {
this.selector = selector;
this.progress = 0;
this.check()
}
ElementTracker.prototype.check = function() {
var _this = this;
if (document.querySelector(this.selector)) {
return this.done()
} else {
return setTimeout((function() {
return _this.check()
}), options.elements.checkInterval)
}
};
ElementTracker.prototype.done = function() {
return this.progress = 100
};
return ElementTracker
})();
DocumentMonitor = (function() {
DocumentMonitor.prototype.states = {
loading: 0,
interactive: 50,
complete: 100
};
function DocumentMonitor() {
var _onreadystatechange, _ref2, _this = this;
this.progress = (_ref2 = this.states[document.readyState]) != null ? _ref2: 100;
_onreadystatechange = document.onreadystatechange;
document.onreadystatechange = function() {
if (_this.states[document.readyState] != null) {
_this.progress = _this.states[document.readyState]
}
return typeof _onreadystatechange === "function" ? _onreadystatechange.apply(null, arguments) : void 0
}
}
return DocumentMonitor
})();
EventLagMonitor = (function() {
function EventLagMonitor() {
var avg, interval, last, points, samples, _this = this;
this.progress = 0;
avg = 0;
samples = [];
points = 0;
last = now();
interval = setInterval(function() {
var diff;
diff = now() - last - 50;
last = now();
samples.push(diff);
if (samples.length > options.eventLag.sampleCount) {
samples.shift()
}
avg = avgAmplitude(samples);
if (++points >= options.eventLag.minSamples && avg < options.eventLag.lagThreshold) {
_this.progress = 100;
return clearInterval(interval)
} else {
return _this.progress = 100 * (3 / (avg + 3))
}
},
50)
}
return EventLagMonitor
})();
Scaler = (function() {
function Scaler(source) {
this.source = source;
this.last = this.sinceLastUpdate = 0;
this.rate = options.initialRate;
this.catchup = 0;
this.progress = this.lastProgress = 0;
if (this.source != null) {
this.progress = result(this.source, "progress")
}
}
Scaler.prototype.tick = function(frameTime, val) {
var scaling;
if (val == null) {
val = result(this.source, "progress")
}
if (val >= 100) {
this.done = true
}
if (val === this.last) {
this.sinceLastUpdate += frameTime
} else {
if (this.sinceLastUpdate) {
this.rate = (val - this.last) / this.sinceLastUpdate
}
this.catchup = (val - this.progress) / options.catchupTime;
this.sinceLastUpdate = 0;
this.last = val
}
if (val > this.progress) {
this.progress += this.catchup * frameTime
}
scaling = 1 - Math.pow(this.progress / 100, options.easeFactor);
this.progress += scaling * this.rate * frameTime;
this.progress = Math.min(this.lastProgress + options.maxProgressPerFrame, this.progress);
this.progress = Math.max(0, this.progress);
this.progress = Math.min(100, this.progress);
this.lastProgress = this.progress;
return this.progress
};
return Scaler
})();
sources = null;
scalers = null;
bar = null;
uniScaler = null;
animation = null;
cancelAnimation = null;
Pace.running = false;
handlePushState = function() {
if (options.restartOnPushState) {
return Pace.restart()
}
};
if (window.history.pushState != null) {
_pushState = window.history.pushState;
window.history.pushState = function() {
handlePushState();
return _pushState.apply(window.history, arguments)
}
}
if (window.history.replaceState != null) {
_replaceState = window.history.replaceState;
window.history.replaceState = function() {
handlePushState();
return _replaceState.apply(window.history, arguments)
}
}
SOURCE_KEYS = {
ajax: AjaxMonitor,
elements: ElementMonitor,
document: DocumentMonitor,
eventLag: EventLagMonitor
}; (init = function() {
var type, _j, _k, _len1, _len2, _ref2, _ref3, _ref4;
Pace.sources = sources = [];
_ref2 = ["ajax", "elements", "document", "eventLag"];
for (_j = 0, _len1 = _ref2.length; _j < _len1; _j++) {
type = _ref2[_j];
if (options[type] !== false) {
sources.push(new SOURCE_KEYS[type](options[type]))
}
}
_ref4 = (_ref3 = options.extraSources) != null ? _ref3: [];
for (_k = 0, _len2 = _ref4.length; _k < _len2; _k++) {
source = _ref4[_k];
sources.push(new source(options))
}
Pace.bar = bar = new Bar;
scalers = [];
return uniScaler = new Scaler
})();
Pace.stop = function() {
Pace.trigger("stop");
Pace.running = false;
bar.destroy();
cancelAnimation = true;
if (animation != null) {
if (typeof cancelAnimationFrame === "function") {
cancelAnimationFrame(animation)
}
animation = null
}
return init()
};
Pace.restart = function() {
Pace.trigger("restart");
Pace.stop();
return Pace.start()
};
Pace.go = function() {
var start;
Pace.running = true;
bar.render();
start = now();
cancelAnimation = false;
return animation = runAnimation(function(frameTime, enqueueNextFrame) {
var avg, count, done, element, elements, i, j, remaining, scaler, scalerList, sum, _j, _k, _len1, _len2, _ref2;
remaining = 100 - bar.progress;
count = sum = 0;
done = true;
for (i = _j = 0, _len1 = sources.length; _j < _len1; i = ++_j) {
source = sources[i];
scalerList = scalers[i] != null ? scalers[i] : scalers[i] = [];
elements = (_ref2 = source.elements) != null ? _ref2: [source];
for (j = _k = 0, _len2 = elements.length; _k < _len2; j = ++_k) {
element = elements[j];
scaler = scalerList[j] != null ? scalerList[j] : scalerList[j] = new Scaler(element);
done &= scaler.done;
if (scaler.done) {
continue
}
count++;
sum += scaler.tick(frameTime)
}
}
avg = sum / count;
bar.update(uniScaler.tick(frameTime, avg));
if (bar.done() || done || cancelAnimation) {
bar.update(100);
Pace.trigger("done");
return setTimeout(function() {
bar.finish();
Pace.running = false;
return Pace.trigger("hide")
},
Math.max(options.ghostTime, Math.max(options.minTime - (now() - start), 0)))
} else {
return enqueueNextFrame()
}
})
};
Pace.start = function(_options) {
extend(options, _options);
Pace.running = true;
try {
bar.render()
} catch(_error) {
NoTargetError = _error
}
if (!document.querySelector(".pace")) {
return setTimeout(Pace.start, 50)
} else {
Pace.trigger("start");
return Pace.go()
}
};
if (typeof define === "function" && define.amd) {
define(function() {
return Pace
})
} else {
if (typeof exports === "object") {
module.exports = Pace
} else {
if (options.startOnPageLoad) {
Pace.start()
}
}
}
}).call(this); 
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