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解决pc端屏幕缩放比例对页面布局的影响

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

  1. 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。
  2. 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。
  3. 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
  4. 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();">

 

posted @ 2021-09-07 10:50  不懒人  阅读(3279)  评论(0)  编辑  收藏  举报