smart-admin/rc-busness/static/js/rem.js

47 lines
1.3 KiB
JavaScript
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;(function(designWidth, maxWidth) {
var doc = document,
win = window,
docEl = doc.documentElement,
remStyle = document.createElement("style"),
tid;
function refreshRem() {
var width = docEl.getBoundingClientRect().width;
maxWidth = maxWidth || 540;
width>maxWidth && (width=maxWidth);
var rem = width * 100 / designWidth;
debugger;
remStyle.innerHTML = 'html{font-size:' + rem + 'px;}';
}
if (docEl.firstElementChild) {
docEl.firstElementChild.appendChild(remStyle);
} else {
var wrap = doc.createElement("div");
wrap.appendChild(remStyle);
doc.write(wrap.innerHTML);
wrap = null;
}
//要等 wiewport 设置好后才能执行 refreshRem不然 refreshRem 会执行2次
refreshRem();
win.addEventListener("resize", function() {
clearTimeout(tid); //防止执行两次
tid = setTimeout(refreshRem, 300);
}, false);
win.addEventListener("pageshow", function(e) {
if (e.persisted) { // 浏览器后退的时候重新计算
clearTimeout(tid);
tid = setTimeout(refreshRem, 300);
}
}, false);
if (doc.readyState === "complete") {
doc.body.style.fontSize = "14px";
} else {
doc.addEventListener("DOMContentLoaded", function(e) {
doc.body.style.fontSize = "14px";
}, false);
}
})(37.5, 37.5);