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- var dpr, rem, scale;
- var docEl = document.documentElement;
- var fontEl = document.createElement('style');
- var metaEl = document.querySelector('meta[name="viewport"]');
- dpr = window.devicePixelRatio || 1;
- rem = docEl.clientWidth * dpr / 10;
- scale = 1 / dpr;
- // 设置viewport,进行缩放,达到高清效果
- metaEl.setAttribute('content', 'width=' + dpr * docEl.clientWidth + ',initial-scale=' + scale + ',maximum-scale=' + scale + ', minimum-scale=' + scale + ',user-scalable=no');
- // 设置data-dpr属性,留作的css hack之用
- docEl.setAttribute('data-dpr', dpr);
- // 动态写入样式
- docEl.firstElementChild.appendChild(fontEl);
- fontEl.innerHTML = 'html{font-size:' + rem + 'px!important;}';
- // 给js调用的,某一dpr下rem和px之间的转换函数
- window.rem2px = function(v) {
- v = parseFloat(v);
- return v * rem;
- };
- window.px2rem = function(v) {
- v = parseFloat(v);
- return v / rem;
- };
- window.dpr = dpr;
- window.rem = rem;
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