vw, vh, vmin, vmax：IE9+局部支持，chrome/firefox/safari/opera支持，iOS safari 8+支持，Android browser4.4+支持，chrome for android39支持
/* html中font-size：100px; 1rem == 100px; 100px == ?vw;如果设计图为640px;
考虑的dpr 2 640px / 2 == 320px; 100vw == 320px; 1vw == 3.2px; ?vw == 100px;31.25vw == 100px;
1rem = 100px = 31.25vw如果设计图为750px;
考虑的dpr 2 750px / 2 == 375px; 100vw == 375px; 1vw == 3.75px; ?vw == 100px;26.67vw == 100px;
1rem = 100px = 26.67vw */清除默认
@charset "utf-8";
html,body,ul,li,ol,dl,dd,dt,p,h1,h2,h3,h4,h5,h6,form,fieldset,legend,img,input,figure{margin:0;padding:0}
{box-sizing:border-box;}/触发怪异盒模型*/
body{font-family: '微软雅黑';}
h1,h2,h3,h4,h5,h6{font-weight:normal;font-size:16px;}
b,strong{font-weight:normal;}
em,i{font-style:normal;}
a,u{text-decoration:none;}
img{border:0;display:block;}
ul,ol,li{list-style:none;}
input{outline:none;}
.clear-fix:after{content:".";clear:both;display:block;height:0;overflow: hidden;visibility: hidden;}
html,body{height:100%;}