//判断本地时间是否在 时间区间内
//time1 开始日期
//time2 结束日期



function func(time1, time2) {
	var time = date.parse(new date());
	var date1 = date.parse(new date(time1.replace(/-/g, '/')));
	var date2 = date.parse(new date(time2.replace(/-/g, '/')));
	if (date1 < time && date2 > time) {
		return true;
	};
	return false;
}
if (func('2020-04-03 23:59:59', '2020-04-05 00:00:01')) {
	document.writeln("<style type=\"text/css\">");
	document.writeln(".site-gray, html{");
	document.writeln("filter: gray !important;");
	document.writeln("filter:progid:dximagetransform.microsoft.basicimage(grayscale=1);");
	document.writeln("filter: grayscale(100%);");
	document.writeln("-webkit-filter: grayscale(100%);");
	document.writeln("-moz-filter: grayscale(100%);");
	document.writeln("-ms-filter: grayscale(100%);");
	document.writeln("-o-filter: grayscale(100%);");
	document.writeln("}");
	document.writeln("</style>");

	var grayscale = (function() {

		var config = {
				colorprops: ['color', 'backgroundcolor', 'borderbottomcolor', 'bordertopcolor', 'borderleftcolor', 'borderrightcolor', 'backgroundimage'],
				externalimagehandler: {
					/* grayscaling externally hosted images does not work
					   - use these functions to handle those images as you so desire */
					/* out of convenience these functions are also used for browsers
					   like chrome that do not support canvascontext.getimagedata */
					init: function(el, src) {
						if (el.nodename.tolowercase() === 'img') {
							// is img element...
						} else {
							// is background-image element:
							// default - remove background images
							data(el).backgroundimagesrc = src;
							el.style.backgroundimage = '';
						}
					},
					reset: function(el) {
						if (el.nodename.tolowercase() === 'img') {
							// is img element...
						} else {
							// is background-image element:
							el.style.backgroundimage = 'url(' + (data(el).backgroundimagesrc || '') + ')';
						}
					}
				}
			},
			log = function() {
				try {
					window.console.log.apply(console, arguments);
				} catch (e) {};
			},
			isexternal = function(url) {
				// checks whether url is external: 'canvascontext.getimagedata'
				// only works if the image is on the current domain.
				return (new regexp('https?://(?!' + window.location.hostname + ')')).test(url);
			},
			data = (function() {

				var cache = [0],
					expando = 'data' + (+new date());

				return function(elem) {
					var cacheindex = elem[expando],
						nextcacheindex = cache.length;
					if (!cacheindex) {
						cacheindex = elem[expando] = nextcacheindex;
						cache[cacheindex] = {};
					}
					return cache[cacheindex];
				};

			})(),
			desatimg = function(img, prepare, realel) {

				// realel is only set when img is temp (for bg images)

				var canvas = document.createelement('canvas'),
					context = canvas.getcontext('2d'),
					height = img.naturalheight || img.offsetheight || img.height,
					width = img.naturalwidth || img.offsetwidth || img.width,
					imgdata;

				canvas.height = height;
				canvas.width = width;
				context.drawimage(img, 0, 0);
				try {
					imgdata = context.getimagedata(0, 0, width, height);
				} catch (e) {}

				if (prepare) {
					desatimg.preparing = true;
					// slowly recurse through pixels for prep,
					// :: only occurs on grayscale.prepare()
					var y = 0;
					(function() {

						if (!desatimg.preparing) {
							return;
						}

						if (y === height) {
							// finished!
							context.putimagedata(imgdata, 0, 0, 0, 0, width, height);
							realel ? (data(realel).bgdataurl = canvas.todataurl()) :
								(data(img).dataurl = canvas.todataurl())
						}

						for (var x = 0; x < width; x++) {
							var i = (y * width + x) * 4;
							// apply monoschrome level across all channels:
							imgdata.data[i] = imgdata.data[i + 1] = imgdata.data[i + 2] =
								rgbtograyscale(imgdata.data[i], imgdata.data[i + 1], imgdata.data[i + 2]);
						}

						y++;
						settimeout(arguments.callee, 0);

					})();
					return;
				} else {
					// if desatimg was called without 'prepare' flag
					// then cancel recursion and proceed with force! (below)
					desatimg.preparing = false;
				}

				for (var y = 0; y < height; y++) {
					for (var x = 0; x < width; x++) {
						var i = (y * width + x) * 4;
						// apply monoschrome level across all channels:
						imgdata.data[i] = imgdata.data[i + 1] = imgdata.data[i + 2] =
							rgbtograyscale(imgdata.data[i], imgdata.data[i + 1], imgdata.data[i + 2]);
					}
				}

				context.putimagedata(imgdata, 0, 0, 0, 0, width, height);
				return canvas;

			},
			getstyle = function(el, prop) {
				var style = document.defaultview && document.defaultview.getcomputedstyle ?
					document.defaultview.getcomputedstyle(el, null)[prop] :
					el.currentstyle[prop];
				// if format is #ffffff: (convert to rgb)
				if (style && /^#[a-f0-9]/i.test(style)) {
					var hex = style.match(/[a-f0-9]{2}/ig);
					style = 'rgb(' + parseint(hex[0], 16) + ',' +
						parseint(hex[1], 16) + ',' +
						parseint(hex[2], 16) + ')';
				}
				return style;
			},
			rgbtograyscale = function(r, g, b) {
				// returns single monochrome figure:
				return parseint((0.2125 * r) + (0.7154 * g) + (0.0721 * b), 10);
			},
			getallnodes = function(context) {
				var all = array.prototype.slice.call(context.getelementsbytagname('*'));
				all.unshift(context);
				return all;
			};

		var init = function(context) {

			// handle if a dom collection is passed instead of a single el:
			if (context && context[0] && context.length && context[0].nodename) {
				// is a dom collection:
				var allcontexts = array.prototype.slice.call(context),
					cindex = -1,
					clen = allcontexts.length;
				while (++cindex < clen) {
					init.call(this, allcontexts[cindex]);
				}
				return;
			}

			context = context || document.documentelement;

			if (!document.createelement('canvas').getcontext) {
				context.style.filter = 'progid:dximagetransform.microsoft.basicimage(grayscale=1)';
				context.style.zoom = 1;
				return;
			}

			var all = getallnodes(context),
				i = -1,
				len = all.length;

			while (++i < len) {
				var cur = all[i];

				if (cur.nodename.tolowercase() === 'img') {
					var src = cur.getattribute('src');
					if (!src) {
						continue;
					}
					if (isexternal(src)) {
						config.externalimagehandler.init(cur, src);
					} else {
						data(cur).realsrc = src;
						try {
							// within try statement just encase there's no support....
							cur.src = data(cur).dataurl || desatimg(cur).todataurl();
						} catch (e) {
							config.externalimagehandler.init(cur, src);
						}
					}

				} else {
					for (var pindex = 0, plen = config.colorprops.length; pindex < plen; pindex++) {
						var prop = config.colorprops[pindex],
							style = getstyle(cur, prop);
						if (!style) {
							continue;
						}
						if (cur.style[prop]) {
							data(cur)[prop] = style;
						}
						// rgb color:
						if (style.substring(0, 4) === 'rgb(') {
							var monorgb = rgbtograyscale.apply(null, style.match(/\d+/g));
							cur.style[prop] = style = 'rgb(' + monorgb + ',' + monorgb + ',' + monorgb + ')';
							continue;
						}
						// background image:
						if (style.indexof('url(') > -1) {
							var urlpatt = /\(['"]?(.+?)['"]?\)/,
								url = style.match(urlpatt)[1];
							if (isexternal(url)) {
								config.externalimagehandler.init(cur, url);
								data(cur).externalbg = true;
								continue;
							}
							// data(cur).bgdataurl refers to caches url (from preparation)
							try {
								var imgsrc = data(cur).bgdataurl || (function() {
									var temp = document.createelement('img');
									temp.src = url;
									return desatimg(temp).todataurl();
								})();

								cur.style[prop] = style.replace(urlpatt, function(_, url) {
									return '(' + imgsrc + ')';
								});
							} catch (e) {
								config.externalimagehandler.init(cur, url);
							}
						}
					}
				}
			}

		};

		init.reset = function(context) {
			// handle if a dom collection is passed instead of a single el:
			if (context && context[0] && context.length && context[0].nodename) {
				// is a dom collection:
				var allcontexts = array.prototype.slice.call(context),
					cindex = -1,
					clen = allcontexts.length;
				while (++cindex < clen) {
					init.reset.call(this, allcontexts[cindex]);
				}
				return;
			}
			context = context || document.documentelement;
			if (!document.createelement('canvas').getcontext) {
				context.style.filter = 'progid:dximagetransform.microsoft.basicimage(grayscale=0)';
				return;
			}
			var all = getallnodes(context),
				i = -1,
				len = all.length;
			while (++i < len) {
				var cur = all[i];
				if (cur.nodename.tolowercase() === 'img') {
					var src = cur.getattribute('src');
					if (isexternal(src)) {
						config.externalimagehandler.reset(cur, src);
					}
					cur.src = data(cur).realsrc || src;
				} else {
					for (var pindex = 0, plen = config.colorprops.length; pindex < plen; pindex++) {
						if (data(cur).externalbg) {
							config.externalimagehandler.reset(cur);
						}
						var prop = config.colorprops[pindex];
						cur.style[prop] = data(cur)[prop] || '';
					}
				}
			}
		};

		init.prepare = function(context) {

			// handle if a dom collection is passed instead of a single el:
			if (context && context[0] && context.length && context[0].nodename) {
				// is a dom collection:
				var allcontexts = array.prototype.slice.call(context),
					cindex = -1,
					clen = allcontexts.length;
				while (++cindex < clen) {
					init.prepare.call(null, allcontexts[cindex]);
				}
				return;
			}

			// slowly recurses through all elements
			// so as not to lock up on the user.

			context = context || document.documentelement;

			if (!document.createelement('canvas').getcontext) {
				return;
			}

			var all = getallnodes(context),
				i = -1,
				len = all.length;

			while (++i < len) {
				var cur = all[i];
				if (data(cur).skip) {
					return;
				}
				if (cur.nodename.tolowercase() === 'img') {
					if (cur.getattribute('src') && !isexternal(cur.src)) {
						desatimg(cur, true);
					}

				} else {
					var style = getstyle(cur, 'backgroundimage');
					if (style.indexof('url(') > -1) {
						var urlpatt = /\(['"]?(.+?)['"]?\)/,
							url = style.match(urlpatt)[1];
						if (!isexternal(url)) {
							var temp = document.createelement('img');
							temp.src = url;
							desatimg(temp, true, cur);
						}
					}
				}
			}
		};

		return init;

	})();

	var navstr = navigator.useragent.tolowercase();
	$(function() {

		if (navstr.indexof("msie 10.0") !== -1 || navstr.indexof("rv:11.0") !== -1) { // 判断是ie10或者ie11
			grayscale(document.body);
			//grayscale(document.getelementsbytagname("img"));
		}
		$("html").addclass("site-gray");
	});
}