49 lines
1.8 KiB
JavaScript
49 lines
1.8 KiB
JavaScript
let flexible = (designWidth, maxWidth,minWidth) =>{
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var doc = document, win = window, docEl = doc.documentElement, remStyle = document.createElement("style"), tid;
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designWidth = designWidth || 1920;
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maxWidth = maxWidth || 2560;
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minWidth = minWidth || 1024;
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function refreshRem() {
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var width = docEl.getBoundingClientRect().width;
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var height = docEl.getBoundingClientRect().height;
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maxWidth = maxWidth || 1920;
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if(width/height>1.98) width = height * 1.98;
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width > maxWidth && (width = maxWidth);
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width < minWidth && (width = minWidth);
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var rem = width * 10 / designWidth;
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// var rem = Math.round(width * 10 / designWidth);
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docEl.style.fontSize = rem+'px'
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remStyle.innerHTML = 'html{font-size:' + rem + 'px;}';
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}
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// if (docEl.firstElementChild) {
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// docEl.firstElementChild.appendChild(remStyle);
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// } else {
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// var wrap = doc.createElement("div");
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// wrap.appendChild(remStyle);
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// doc.write(wrap.innerHTML);
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// wrap = null;
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// }
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//要等 wiewport 设置好后才能执行 refreshRem，不然 refreshRem 会执行2次；
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refreshRem();
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win.addEventListener("resize", function() {
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clearTimeout(tid); //防止执行两次
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tid = setTimeout(refreshRem, 300);
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}, false);
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win.addEventListener("pageshow", function(e) {
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if (e.persisted) { // 浏览器后退的时候重新计算
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clearTimeout(tid);
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tid = setTimeout(refreshRem, 300);
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}
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}, false);
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if (doc.readyState === "complete") {
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doc.body.style.fontSize = "16px";
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} else {
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doc.addEventListener("DOMContentLoaded", function(e) {
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doc.body.style.fontSize = "16px";
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}, false);
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}
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};
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export default flexible |