现在很多笔记本电脑都推荐将缩放设置为125%，等比例放大显示。
这对我们前端的页面的布局会产生一些影响
- 首先，单独的响应式布局hold不住这个问题，因为出问题的是
device-pixel-ratio。 - 问题现象是高分屏下整好的东西，在普分屏下会放大；而普分屏下整好的东西，在高分屏上会缩小。
- 重现这个问题不需要高分屏，直接用
Ctrl++或者Ctrl+-出来的效果是跟高分屏一致的（所以搞定这个问题之后，也可以同时预防用户误触网页缩放）。另外恢复是Ctrl+Num0 - 解决的关键就是你得在媒体适配里写
device-pixel-ratio单独适配像素比；另外，需要把绝大多数组件由px单位转换为rem单位，因为需要在前边提到的device-pixel-ratio里调节:root的font-size`，以达到动态缩放的目的
方案1
@media all and (-moz-min-device-pixel-ratio: 1.09) and (-moz-max-device-pixel-ratio: 1.18), (-webkit-min-device-pixel-ratio: 1.09) and (-webkit-max-device-pixel-ratio: 1.18), (min-resolution: 1.09dppx) and (max-resolution: 1.18dppx) { :root { font-size: 14px; } } @media all and (-moz-min-device-pixel-ratio: 1.19) and (-moz-max-device-pixel-ratio: 1.28), (-webkit-min-device-pixel-ratio: 1.19) and (-webkit-max-device-pixel-ratio: 1.28), (min-resolution: 1.19dppx) and (max-resolution: 1.28dppx) { :root { font-size: 13px; } } @media all and (-moz-min-device-pixel-ratio: 1.29) and (-moz-max-device-pixel-ratio: 1.4), (-webkit-min-device-pixel-ratio: 1.29) and (-webkit-max-device-pixel-ratio: 1.4), (min-resolution: 1.29dppx) and (max-resolution: 1.4dppx) { :root { font-size: 12px; } } @media all and (-moz-min-device-pixel-ratio: 1.41) and (-moz-max-device-pixel-ratio: 1.6), (-webkit-min-device-pixel-ratio: 1.41) and (-webkit-max-device-pixel-ratio: 1.6), (min-resolution: 1.41dppx) and (max-resolution: 1.6dppx) { :root { font-size: 10px; } } @media all and (-moz-min-device-pixel-ratio: 1.61) and (-moz-max-device-pixel-ratio: 1.8), (-webkit-min-device-pixel-ratio: 1.61) and (-webkit-max-device-pixel-ratio: 1.8), (min-resolution: 1.61dppx) and (max-resolution: 1.8dppx) { :root { font-size: 9px; } } @media all and (-moz-min-device-pixel-ratio: 1.81) and (-moz-max-device-pixel-ratio: 2.1), (-webkit-min-device-pixel-ratio: 1.81) and (-webkit-max-device-pixel-ratio: 2.1), (min-resolution: 1.81dppx) and (max-resolution: 2.1dppx) { :root { font-size: 8px; } }
方案2
/***js代码***/ function handleScreen(){ const m = detectZoom(); document.body.style.zoom = 100/Number(m); } function detectZoom () { let ratio = 0, screen = window.screen, ua = navigator.userAgent.toLowerCase(); if (window.devicePixelRatio !== undefined) { ratio = window.devicePixelRatio; } else if (~ua.indexOf('msie')) { if (screen.deviceXDPI && screen.logicalXDPI) { ratio = screen.deviceXDPI / screen.logicalXDPI; } } else if (window.outerWidth !== undefined && window.innerWidth !== undefined) { ratio = window.outerWidth / window.innerWidth; } if (ratio) { ratio = Math.round(ratio * 100); } return ratio; } function getWindowHeight() { var zoom = document.body.style.zoom; var height = $(window).height(); if (zoom) { return height / zoom; } return height; } function getWindowWidth() { var zoom = document.body.style.zoom; var width = $(window).width(); if (zoom) { return width / zoom; } return width; } window.onresize = function(){ handleScreen() } /***或html的body加上onresize***/ <body onresize="handleScreen();">