移动页面基本结构

// meta:
// <meta content="width=device-width,initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no" name="viewport">
 
(function (init_width) {
  var isAndroid = navigator.userAgent.match(/(Android)/i),
    viewPort = document.querySelector('meta[name=viewport]');
  window.html_font_size = isAndroid
    ? 100
    : (window.innerWidth * 100) / init_width;
 
  function setHtmlWidth() {
    document.querySelector('html').style.fontSize = html_font_size + 'px';
  }
 
  if (isAndroid) {
    content = 'target-densitydpi=320,width=' + init_width + ',user-scalable=no';
    viewPort.setAttribute('content', content);
  } else {
    setHtmlWidth();
    window.onresize = setHtmlWidth;
  }
})(640);

/*css reset*/
html {
  font-size: 100px;
}
body {
  font-size: 0.12rem;
  font-family: '微软雅黑', '宋体', 'arial';
  font-weight: normal;
  overflow-x: hidden;
}
body,
ul,
ol,
p,
h1,
h2,
h3,
h4,
h5,
h6,
dl,
dt,
dd,
form,
textarea,
input {
  margin: 0;
}
ul,
ol {
  list-style: none;
}
ul,
ol,
input {
  padding: 0;
}
table {
  margin: 0 auto;
  width: 100%;
  border-collapse: collapse;
}
a img {
  border: 0;
}
input[type='button'],
input[type='submit'],
input[type='reset'] {
  -webkit-appearance: none;
}
.clearfix:after {
  content: ' ';
  display: block;
  clear: both;
  height: 0;
}
img {
  width: 100%;
}
.max_width {
  width: 6.4rem;
  margin: 0 auto;
  position: relative;
}
.clear {
  width: 100%;
  height: 0;
  clear: both;
}
.clear30 {
  height: 30px;
}
.clearfix {
  zoom: 1;
}
img,
object,
audio,
vedio {
  max-width: 100%;
}
a {
  text-decoration: none;
}

<div class="wrap clearfix">
  <div class="max_width"></div>
</div>