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The requirements for adaptive development of web pages are cross-platform, cross-browser, generally mobile + PC. I wrote a few PC-side full-screen pages a few days ago, using percentages. I checked them on my mobile phone. The effect is far different. From this point of view, the adaptability of mobile+PC is sometimes a false proposition.
The adaptation to the mobile terminal is like the general full-screen sliding of the promotional page, using percentages. If it is complicated, it will definitely not work. I took a closer look at the rem used by Taobao for processing. Unit, let’s learn this method. First of all, for design drawings, the width is generally 640.
rem: CSS3 has added a new relative unit rem (root em, root em), so rem should be set in html{font-size:1rem ;},
Taobao’s setting for this is based on the width of the mobile phone,
This essential sentence: 2af994d9cbba443d6082965d3814d752controlled by js.
First of all, it is different on Apple. Apple 6 is abd0a2d29ebc6da243b5dc998058f6e4
font-size is window.clientWitdh/10;
The code used in Taobao:
!function(J, I) { function H() { var d = E.getBoundingClientRect().width; d / B > 540 && (d = 540 * B); var e = d / 10; E.style.fontSize = e + "px", z.rem = J.rem = e; } var G, F = J.document, E = F.documentElement, D = F.querySelector('meta[name="viewport"]'), C = F.querySelector('meta[name="flexible"]'), B = 0, A = 0, z = I.flexible || (I.flexible = {}); if (D) { console.warn("将根据已有的meta标签来设置缩放比例"); var y = D.getAttribute("content").match(/initial\-scale=([\d\.]+)/); y && (A = parseFloat(y[1]), B = parseInt(1 / A)) } else { if (C) { var x = C.getAttribute("content"); if (x) { var w = x.match(/initial\-dpr=([\d\.]+)/), v = x.match(/maximum\-dpr=([\d\.]+)/); w && (B = parseFloat(w[1]), A = parseFloat((1 / B).toFixed(2))), v && (B = parseFloat(v[1]), A = parseFloat((1 / B).toFixed(2))) } } } if (!B && !A) { var u = (J.navigator.appVersion.match(/android/gi), J.navigator.appVersion.match(/iphone/gi)), t = J.devicePixelRatio; B = u ? t >= 3 && (!B || B >= 3) ? 3 : t >= 2 && (!B || B >= 2) ? 2 : 1 : 1, A = 1 / B } if (E.setAttribute("data-dpr", B), !D) { if (D = F.createElement("meta"), D.setAttribute("name", "viewport"), D.setAttribute("content", "initial-scale=" + A + ", maximum-scale=" + A + ", minimum-scale=" + A + ", user-scalable=no"), E.firstElementChild) { E.firstElementChild.appendChild(D) } else { var s = F.createElement("p"); s.appendChild(D), F.write(s.innerHTML) } } J.addEventListener("resize", function() { clearTimeout(G), G = setTimeout(H, 300) }, !1), J.addEventListener("pageshow", function(b) { b.persisted && (clearTimeout(G), G = setTimeout(H, 300)) }, !1), "complete" === F.readyState ? F.body.style.fontSize = 12 * B + "px": F.addEventListener("DOMContentLoaded", function() { F.body.style.fontSize = 12 * B + "px" }, !1), H(), z.dpr = J.dpr = B, z.refreshRem = H, z.rem2px = function(d) { var c = parseFloat(d) * this.rem; return "string" == typeof d && d.match(/rem$/) && (c += "px"), c }, z.px2rem = function(d) { var c = parseFloat(d) / this.rem; return "string" == typeof d && d.match(/px$/) && (c += "rem"), c } } (window, window.lib || (window.lib = {}));
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