苏宁移动端首页（flexible+rem）

suning-mobile-flexible/css/index.css

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+body {
+  min-width: 320px;
+  max-width: 750px;
+  /* flexible划分了10等分 */
+  width: 10rem;
+  margin: 0 auto;
+  line-height: 1.5;
+  font-family: Arial, Helvetica, sans-serif;
+  background-color: #f2f2f2;
+}
+a {
+  text-decoration: none;
+  font-size: .333333rem;
+}
+/* 如果屏幕超过了750px，那就按照750设计稿来走 */
+@media screen and (min-width: 750px){
+  html {
+    font-size: 75px !important;
+  }
+}
+/* search-content */
+.search-content {
+  display: flex;
+  position: fixed;
+  top: 0;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 10rem;
+  height: 1.173333rem;
+  background-color: #ffc001;
+}
+.classify {
+  width: .586667rem;
+  height: .933333rem;
+  margin: .146667rem .333333rem .133333rem;
+  background: url(../images/classify.png) no-repeat;
+  background-size: .586667rem .933333rem;
+}
+.search {
+  flex: 1;
+}
+.search input {
+  width: 100%;
+  height: .88rem;
+  outline: none;
+  border: 0;
+  margin-top: .133333rem;
+  background-color: #fff2cc;
+  border-radius: .44rem;
+  color: #757575;
+  padding-left: .733333rem
+
+}
+.login {
+  width: 1rem;
+  height: .933333rem;
+  margin: .133333rem;
+  color: #fff;
+  line-height: .933333rem;
+  text-align: center;
+  font-size: .333333rem;
+}

suning-mobile-flexible/css/normalize.css

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+/*! normalize.css v5.0.0 | MIT License | github.com/necolas/normalize.css */
+
+/**
+ * 1. Change the default font family in all browsers (opinionated).
+ * 2. Correct the line height in all browsers.
+ * 3. Prevent adjustments of font size after orientation changes in
+ *    IE on Windows Phone and in iOS.
+ */
+
+/* Document
+   ========================================================================== */
+
+html {
+  font-family: sans-serif; /* 1 */
+  line-height: 1.15; /* 2 */
+  -ms-text-size-adjust: 100%; /* 3 */
+  -webkit-text-size-adjust: 100%; /* 3 */
+}
+
+/* Sections
+   ========================================================================== */
+
+/**
+ * Remove the margin in all browsers (opinionated).
+ */
+
+body {
+  margin: 0;
+}
+
+/**
+ * Add the correct display in IE 9-.
+ */
+
+article,
+aside,
+footer,
+header,
+nav,
+section {
+  display: block;
+}
+
+/**
+ * Correct the font size and margin on `h1` elements within `section` and
+ * `article` contexts in Chrome, Firefox, and Safari.
+ */
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 9-.
+ * 1. Add the correct display in IE.
+ */
+
+figcaption,
+figure,
+main { /* 1 */
+  display: block;
+}
+
+/**
+ * Add the correct margin in IE 8.
+ */
+
+figure {
+  margin: 1em 40px;
+}
+
+/**
+ * 1. Add the correct box sizing in Firefox.
+ * 2. Show the overflow in Edge and IE.
+ */
+
+hr {
+  box-sizing: content-box; /* 1 */
+  height: 0; /* 1 */
+  overflow: visible; /* 2 */
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+pre {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * 1. Remove the gray background on active links in IE 10.
+ * 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
+ */
+
+a {
+  background-color: transparent; /* 1 */
+  -webkit-text-decoration-skip: objects; /* 2 */
+}
+
+/**
+ * Remove the outline on focused links when they are also active or hovered
+ * in all browsers (opinionated).
+ */
+
+a:active,
+a:hover {
+  outline-width: 0;
+}
+
+/**
+ * 1. Remove the bottom border in Firefox 39-.
+ * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+ */
+
+abbr[title] {
+  border-bottom: none; /* 1 */
+  text-decoration: underline; /* 2 */
+  text-decoration: underline dotted; /* 2 */
+}
+
+/**
+ * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
+ */
+
+b,
+strong {
+  font-weight: inherit;
+}
+
+/**
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+code,
+kbd,
+samp {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/**
+ * Add the correct font style in Android 4.3-.
+ */
+
+dfn {
+  font-style: italic;
+}
+
+/**
+ * Add the correct background and color in IE 9-.
+ */
+
+mark {
+  background-color: #ff0;
+  color: #000;
+}
+
+/**
+ * Add the correct font size in all browsers.
+ */
+
+small {
+  font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` elements from affecting the line height in
+ * all browsers.
+ */
+
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+sup {
+  top: -0.5em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 9-.
+ */
+
+audio,
+video {
+  display: inline-block;
+}
+
+/**
+ * Add the correct display in iOS 4-7.
+ */
+
+audio:not([controls]) {
+  display: none;
+  height: 0;
+}
+
+/**
+ * Remove the border on images inside links in IE 10-.
+ */
+
+img {
+  border-style: none;
+}
+
+/**
+ * Hide the overflow in IE.
+ */
+
+svg:not(:root) {
+  overflow: hidden;
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * 1. Change the font styles in all browsers (opinionated).
+ * 2. Remove the margin in Firefox and Safari.
+ */
+
+button,
+input,
+optgroup,
+select,
+textarea {
+  font-family: sans-serif; /* 1 */
+  font-size: 100%; /* 1 */
+  line-height: 1.15; /* 1 */
+  margin: 0; /* 2 */
+}
+
+/**
+ * Show the overflow in IE.
+ * 1. Show the overflow in Edge.
+ */
+
+button,
+input { /* 1 */
+  overflow: visible;
+}
+
+/**
+ * Remove the inheritance of text transform in Edge, Firefox, and IE.
+ * 1. Remove the inheritance of text transform in Firefox.
+ */
+
+button,
+select { /* 1 */
+  text-transform: none;
+}
+
+/**
+ * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
+ *    controls in Android 4.
+ * 2. Correct the inability to style clickable types in iOS and Safari.
+ */
+
+button,
+html [type="button"], /* 1 */
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button; /* 2 */
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
+ */
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+  border-style: none;
+  padding: 0;
+}
+
+/**
+ * Restore the focus styles unset by the previous rule.
+ */
+
+button:-moz-focusring,
+[type="button"]:-moz-focusring,
+[type="reset"]:-moz-focusring,
+[type="submit"]:-moz-focusring {
+  outline: 1px dotted ButtonText;
+}
+
+/**
+ * Change the border, margin, and padding in all browsers (opinionated).
+ */
+
+fieldset {
+  border: 1px solid #c0c0c0;
+  margin: 0 2px;
+  padding: 0.35em 0.625em 0.75em;
+}
+
+/**
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Correct the color inheritance from `fieldset` elements in IE.
+ * 3. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
+ */
+
+legend {
+  box-sizing: border-box; /* 1 */
+  color: inherit; /* 2 */
+  display: table; /* 1 */
+  max-width: 100%; /* 1 */
+  padding: 0; /* 3 */
+  white-space: normal; /* 1 */
+}
+
+/**
+ * 1. Add the correct display in IE 9-.
+ * 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
+ */
+
+progress {
+  display: inline-block; /* 1 */
+  vertical-align: baseline; /* 2 */
+}
+
+/**
+ * Remove the default vertical scrollbar in IE.
+ */
+
+textarea {
+  overflow: auto;
+}
+
+/**
+ * 1. Add the correct box sizing in IE 10-.
+ * 2. Remove the padding in IE 10-.
+ */
+
+[type="checkbox"],
+[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Correct the cursor style of increment and decrement buttons in Chrome.
+ */
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * 1. Correct the odd appearance in Chrome and Safari.
+ * 2. Correct the outline style in Safari.
+ */
+
+[type="search"] {
+  -webkit-appearance: textfield; /* 1 */
+  outline-offset: -2px; /* 2 */
+}
+
+/**
+ * Remove the inner padding and cancel buttons in Chrome and Safari on macOS.
+ */
+
+[type="search"]::-webkit-search-cancel-button,
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+/**
+ * 1. Correct the inability to style clickable types in iOS and Safari.
+ * 2. Change font properties to `inherit` in Safari.
+ */
+
+::-webkit-file-upload-button {
+  -webkit-appearance: button; /* 1 */
+  font: inherit; /* 2 */
+}
+
+/* Interactive
+   ========================================================================== */
+
+/*
+ * Add the correct display in IE 9-.
+ * 1. Add the correct display in Edge, IE, and Firefox.
+ */
+
+details, /* 1 */
+menu {
+  display: block;
+}
+
+/*
+ * Add the correct display in all browsers.
+ */
+
+summary {
+  display: list-item;
+}
+
+/* Scripting
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 9-.
+ */
+
+canvas {
+  display: inline-block;
+}
+
+/**
+ * Add the correct display in IE.
+ */
+
+template {
+  display: none;
+}
+
+/* Hidden
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 10-.
+ */
+
+[hidden] {
+  display: none;
+}

suning-mobile-flexible/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <!-- 视口标签 -->
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, maximum-scal=1.0, minimum-scale=1.0">
+  <title>苏宁flexible</title>
+  <!-- 引入CSS初始化 -->
+  <link rel="stylesheet" href="css/normalize.css">
+  <!-- 引入首页的CSS -->
+  <link rel="stylesheet" href="css/index.css">
+  <!-- 引入flexible.js文件 -->
+  <script src="js/flexible.js"></script>
+</head>
+<body>
+  <div class="search-content">
+    <a href="#" class="classify"></a>
+    <div class="search">
+      <form action="">
+        <input type="search" value="rem适配方案2">
+      </form>
+    </div>
+    <a href="#"class='login'>登录</a>
+  </div>
+</body>
+</html>

suning-mobile-flexible/js/flexible.js

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+(function flexible (window, document) {
+  var docEl = document.documentElement
+  var dpr = window.devicePixelRatio || 1
+
+  // adjust body font size
+  function setBodyFontSize () {
+    if (document.body) {
+      document.body.style.fontSize = (12 * dpr) + 'px'
+    }
+    else {
+      document.addEventListener('DOMContentLoaded', setBodyFontSize)
+    }
+  }
+  setBodyFontSize();
+
+  // set 1rem = viewWidth / 10
+  function setRemUnit () {
+    var rem = docEl.clientWidth / 10
+    docEl.style.fontSize = rem + 'px'
+  }
+
+  setRemUnit()
+
+  // reset rem unit on page resize
+  window.addEventListener('resize', setRemUnit)
+  window.addEventListener('pageshow', function (e) {
+    if (e.persisted) {
+      setRemUnit()
+    }
+  })
+
+  // detect 0.5px supports
+  if (dpr >= 2) {
+    var fakeBody = document.createElement('body')
+    var testElement = document.createElement('div')
+    testElement.style.border = '.5px solid transparent'
+    fakeBody.appendChild(testElement)
+    docEl.appendChild(fakeBody)
+    if (testElement.offsetHeight === 1) {
+      docEl.classList.add('hairlines')
+    }
+    docEl.removeChild(fakeBody)
+  }
+}(window, document))