rem响应式布局,通过使用一个脚本就可以rem自适应,不用再为各种设备宽度不同而烦恼如何实现自适应的问题。
效果图大小=手机屏幕大小X手机高清率,字体大小=理想字体X手机高清率。假如已iphone5为设计参考,整体字体大小为12px,那么效果图大小应该为640px,字体大小为36px,个人建议为咯适屏,效果图基于320px3来做设计~~
'use strict';
//判断访问终端
var browser = {
versions: function () {
var u = navigator.userAgent,
app = navigator.appVersion;
return {
mobile: !!u.match(/AppleWebKit.*Mobile.*/) //是否为移动终端
};
}(),
language: (navigator.browserLanguage || navigator.language).toLowerCase()
};
function insertStyle() {
var //定义屏幕高清度
dpr = 1,
//定义缩放比例
scale = 1,
//获取html节点
docEl = document.documentElement,
//创建style
fontEl = document.createElement('style'),
//查找meta[name="viewport"]节点
metaEl = document.querySelector('meta[name="viewport"]'),
clientW = 0;
//获取屏幕高清度(四舍五入)
dpr = Math.round(window.devicePixelRatio || 1);
//是否为移动设备
if (!browser.versions.mobile) {
//否=自定义宽度480px
clientW = 480;
docEl.style.width = '480px';
docEl.style.margin = '0 auto';
} else {
//是=获取屏幕宽度
clientW = window.screen.width;
}
// 设置viewport,进行缩放,达到高清效果
metaEl.setAttribute('content', 'width=' + scale * clientW + ',initial-scale=' + scale + ',maximum-scale=' + scale + ', minimum-scale=' + scale + ',user-scalable=no');
// 设置data-dpr属性,留作的css hack之用
docEl.setAttribute('data-dpr', dpr);
// 动态写入样式
docEl.firstElementChild.appendChild(fontEl);
fontEl.id = "styleHtml";
fontEl.innerHTML = 'html{font-size:' + clientW / 10 + 'px!important;}';
};
insertStyle();
//窗口大小改变刷新页面
window.addEventListener("resize", function () {
var time;
window.clearTimeout(time);
time = setTimeout(function () {
var tynode = document.getElementById("styleHtml");
tynode.parentNode.removeChild(tynode);
insertStyle();
}, 100);
}, false);
/* 360为效果图分辨率 */
$pageWdith:360/10;
/* 效果图应对那种高清屏设计 */
$devicePixelRatio:3;
/* 效果px转换为适应rem */
@function rem($px) {
@return $px/$pageWdith/$devicePixelRatio*1rem;
}
/* 手机高清屏获取不同像素图片 */
@mixin backgroundSet($picName, $picType:jpg) {
background-image: url(../Images/1x/#{$picName}.#{$picType});
background-image: -webkit-image-set(url(../Images/1x/#{$picName}.#{$picType}) 1x, url(../Images/2x/#{$picName}.#{$picType}) 2x, url(../Images/3x/#{$picName}.#{$picType}) 3x, url(../Images/3x/#{$picName}.#{$picType}) 4x);
background-image: image-set(url(../Images/1x/#{$picName}.#{$picType}) 1x, url(../Images/1x/#{$picName}.#{$picType}) 2x, url(../Images/3x/#{$picName}.#{$picType}) 3x, url(../Images/3x/#{$picName}.#{$picType}) 4x);
background-repeat: no-repeat;
background-size: contain;
}