手机页面rem布局

手机页面设计一般的大小是640,但是,手机屏幕大小确实不确定的,这样,怎么才能做出适应所有手机的手机页面呢?
一般的解决方案有两种,rem布局和百分比布局,更推荐用rem布局来制作手机页面。

首先,给页面的html定义一个100px的
html{ font-size:100px;}/*设定基础rem*/

然后就是这一段js运算了,根据页面的大小来控制基础rem的值;

new function (){
   var _self = this;
   _self.width = 640;//设置默认最大宽度
   _self.fontSize = 100;//默认字体大小
   _self.widthProportion = function(){var p = (document.body&&document.body.clientWidthdocument.getElementsByTagName("html")[0].offsetWidth)/_self.width;return p>1?1:p<0.5?0.5:p;};
   _self.changePage = function(){
       document.getElementsByTagName("html")[0].setAttribute("style","font-size:"+_self.widthProportion()*_self.fontSize+"px !important");
   }
   _self.changePage();
   window.addEventListener("resize",function(){_self.changePage();},false);
};

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0">
<meta charset="utf-8">
<title>rem基础布局</title>
<script type="text/javascript">
new function (){
   var _self = this;
   _self.width = 640;//设置默认最大宽度
   _self.fontSize = 100;//默认字体大小
   _self.widthProportion = function(){var p = (document.body&&document.body.clientWidthdocument.getElementsByTagName("html")[0].offsetWidth)/_self.width;return p>1?1:p<0.5?0.5:p;};
   _self.changePage = function(){
       document.getElementsByTagName("html")[0].setAttribute("style","font-size:"+_self.widthProportion()*_self.fontSize+"px !important");
   }
   _self.changePage();
   window.addEventListener("resize",function(){_self.changePage();},false);
};
</script>
<style type="text/css">
/*=== base style===*/
*{margin: 0px; padding: 0px;}
ul{list-style: none;}
.wrap{min- 320px; max- 640px;  100%; margin: 0px auto;; background: #2a6ace; font-family:"微软雅黑", "helvetica neue",tahoma,"hiragino sans gb",stheiti,"wenquanyi micro hei",5FAE8F6F96C59ED1,5B8B4F53,sans-serif; font-size: 12px;}/*适用于手机端:字体大小用em,1em=16px;为默认字体大小;最大宽度640*/

.pro{6.2rem; margin: 0px auto; padding-top: 20px; overflow: hidden;}
.clearfix:after {content:"";height:0;display:block;clear:both;}
.clearfix {zoom:1;}
.pro ul{6.4rem;}
.pro li{ 3rem; height: 3.6rem; float: left; margin: 0 0.2rem 0.2rem 0;}
.pro li .box{ 3rem; height: 3rem; background: #ccc;}
.pro li p{font-size: 0.24rem; line-height: 0.6rem; text-align: center;}
</style>
</head>
<body>
<div class="wrap">
   <div class="pro">
      <ul class="clearfix">
         <li> <div class="box"></div> <p>区块文案</p> </li>
         <li> <div class="box"></div> <p>区块文案</p> </li>
         <li> <div class="box"></div> <p>区块文案</p> </li>
         <li> <div class="box"></div> <p>区块文案</p> </li>
         <li> <div class="box"></div> <p>区块文案</p> </li>
      </ul>
   </div>
</div>
</body>
</html>
// 监听浏览器,针对不同分辨率计算font-size
// 然后根据设计稿比如尺寸是640尺寸 rem = 设计稿的字体大小 / 100 ; 16px —> 0.16rem

(function (doc, win) {
    var docEl = doc.documentElement,
        resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
        recalc = function () {
            var clientWidth = docEl.clientWidth;
            if (!clientWidth) return;
            if (clientWidth<=320){
                docEl.style.fontSize = '50px';
            }
            // else if(clientWidth>=640){
            //     docEl.style.fontSize = '100px';
            // }
            else{
                docEl.style.fontSize = 100 * (clientWidth / 640) + 'px';
            }
        };
    if (!doc.addEventListener) return;
    win.addEventListener(resizeEvt, recalc, false);
    doc.addEventListener('DOMContentLoaded', recalc, false);
})(document, window);
原文地址:https://www.cnblogs.com/wenb/p/5884399.html