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cyea/rem.js

Last active Jul 20, 2018
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可伸缩布局方案
/**
* 可伸缩布局方案
* rem计算方式:设计图尺寸px / 100 = 实际rem 【例: 100px = 1rem,32px = .32rem】
*/
console.log(
" %c YUYE %c chenyeah.com ",
"color:#fadfa3;background:#030307;padding:5px 0;border-radius:4px 0 0 4px",
";color:#fff;background:#41b883;padding:5px 0;border-radius:0 4px 4px 0"
);
!(function(window) {
/* 设计图文档宽度 */
var docWidth = 750;
var doc = window.document,
docEl = doc.documentElement,
resizeEvt =
"orientationchange" in window ? "orientationchange" : "resize";
var recalc = (function refreshRem() {
var clientWidth = docEl.getBoundingClientRect().width;
/* 8.55:小于320px不再缩小,11.2:大于420px不再放大 */
docEl.style.fontSize =
Math.max(Math.min(20 * (clientWidth / docWidth), 11.2), 8.55) * 5 +
"px";
return refreshRem;
})();
/* 添加倍屏标识,安卓为1 */
docEl.setAttribute(
"data-dpr",
window.navigator.appVersion.match(/iphone/gi)
? window.devicePixelRatio
: 1
);
if (/iP(hone|od|ad)/.test(window.navigator.userAgent)) {
/* 添加IOS标识 */
doc.documentElement.classList.add("ios");
/* IOS8以上给html添加hairline样式,以便特殊处理 */
if (
parseInt(
window.navigator.appVersion.match(/OS (\d+)_(\d+)_?(\d+)?/)[1],
10
) >= 8
)
doc.documentElement.classList.add("hairline");
}
if (!doc.addEventListener) return;
window.addEventListener(resizeEvt, recalc, false);
doc.addEventListener("DOMContentLoaded", recalc, false);
})(window);
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