76 lines
2.5 KiB
HTML
76 lines
2.5 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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<script>
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//designWidth:设计稿的实际宽度值，需要根据实际设置
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//maxWidth:制作稿的最大宽度值，需要根据实际设置
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//这段js的最后面有两个参数记得要设置，一个为设计稿实际宽度，一个为制作稿最大宽度，例如设计稿为750，最大宽度为750，则为(750,750)
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; (function (designWidth, maxWidth) {
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var doc = document,
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win = window,
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docEl = doc.documentElement,
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remStyle = document.createElement("style"),
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tid;
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function refreshRem() {
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var width = docEl.getBoundingClientRect().width;
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maxWidth = maxWidth || 540;
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width > maxWidth && (width = maxWidth);
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var rem = width * 100 / designWidth;
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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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})(750, 750);
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</script>
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<style>
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*{
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padding:0;
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margin: 0;
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}
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.nav{
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width:2.7rem;
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height: 2.5rem;
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background: skyblue;
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}
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</style>
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</head>
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<body>
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<div class="nav"></div>
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</body>
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</html> |