// javascript document
! function(a) {
			function b() {
				var b = g.getboundingclientrect().width;
				b / c > 640 && (b = 640 * c), a.rem = b / 16, g.style.fontsize = a.rem + "px"
			}
			var c, d, e, f = a.document,
					g = f.documentelement,
					h = f.queryselector('meta[name="viewport"]'),
					i = f.queryselector('meta[name="flexible"]');
			if (h) {
				console.warn("将根据已有的meta标签来设置缩放比例");
				var j = h.getattribute("content").match(/initial\-scale=(["']?)([\d\.]+)\1?/);
				j && (d = parsefloat(j[2]), c = parseint(1 / d))
			} else if (i) {
				var j = i.getattribute("content").match(/initial\-dpr=(["']?)([\d\.]+)\1?/);
				j && (c = parsefloat(j[2]), d = parsefloat((1 / c).tofixed(2)))
			}
			if (!c && !d) {
				var k = (a.navigator.appversion.match(/android/gi), a.navigator.appversion.match(/iphone/gi)),
						c = a.devicepixelratio;
				c = k ? c >= 3 ? 3 : c >= 2 ? 2 : 1 : 1, d = 1 / c
			}
			if (g.setattribute("data-dpr", c), !h)
				if (h = f.createelement("meta"), h.setattribute("name", "viewport"), h.setattribute("content", "initial-scale=" + d + ", maximum-scale=" + d + ", minimum-scale=" + d + ", user-scalable=no"), g.firstelementchild) g.firstelementchild.appendchild(h);
				else {
					var l = f.createelement("div");
					l.appendchild(h), f.write(l.innerhtml)
				}
			a.dpr = c, a.addeventlistener("resize", function() {
				cleartimeout(e), e = settimeout(b, 300)
			}, !1), a.addeventlistener("pageshow", function(a) {
				a.persisted && (cleartimeout(e), e = settimeout(b, 300))
			}, !1), "complete" === f.readystate ? f.body.style.fontsize = 12 * c + "px" : f.addeventlistener("domcontentloaded", function() {
				f.body.style.fontsize = 12 * c + "px"
			}, !1), b()
		}(window);