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46 lines
1.3 KiB
46 lines
1.3 KiB
(function (designWidth, maxWidth) {
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var doc = document
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var win = window
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var docEl = doc.documentElement
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var remStyle = document.createElement('style')
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var 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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})(1920, 1920)
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