这是一个很久以前发布的问题，但今天当我在寻找相同的答案“如何检测放大和缩小事件”时，我找不到一个适合所有浏览器的答案。

就像现在一样:对于Firefox/Chrome/IE8和IE9，放大和缩小会触发一个窗口。调整大小事件。 可以使用以下方法捕获:

$(window).resize(function() {
//YOUR CODE.
});

现在的情况比刚提出这个问题时还要糟糕。通过阅读我所能找到的所有回复和博客文章，这里有一个总结。我还设置了这个页面来测试所有这些测量缩放级别的方法。[↑断裂链接。存档副本→此处]。

编辑(2011-12-12):我添加了一个可以克隆的项目:https://github.com/tombigel/detect-zoom

IE8: screen.deviceXDPI / screen.logicalXDPI (or, for the zoom level relative to default zoom, screen.systemXDPI / screen.logicalXDPI) IE7: var body = document.body,r = body.getBoundingClientRect(); return (r.left-r.right)/body.offsetWidth; (thanks to this example or this answer) FF3.5 ONLY: screen.width / media query screen width (see below) (takes advantage of the fact that screen.width uses device pixels but MQ width uses CSS pixels--thanks to Quirksmode widths) FF3.6: no known method FF4+: media queries binary search (see below) WebKit: https://www.chromestatus.com/feature/5737866978131968 (thanks to Teo in the comments) WebKit: measure the preferred size of a div with -webkit-text-size-adjust:none. WebKit: (broken since r72591) document.width / jQuery(document).width() (thanks to Dirk van Oosterbosch above). To get ratio in terms of device pixels (instead of relative to default zoom), multiply by window.devicePixelRatio. Old WebKit? (unverified): parseInt(getComputedStyle(document.documentElement,null).width) / document.documentElement.clientWidth (from this answer) Opera: document.documentElement.offsetWidth / width of a position:fixed; width:100% div. from here (Quirksmode's widths table says it's a bug; innerWidth should be CSS px). We use the position:fixed element to get the width of the viewport including the space where the scrollbars are; document.documentElement.clientWidth excludes this width. This is broken since sometime in 2011; I know no way to get the zoom level in Opera anymore. Other: Flash solution from Sebastian Unreliable: listen to mouse events and measure change in screenX / change in clientX

这里是Firefox 4的二进制搜索，因为我不知道它暴露在哪里:

<style id=binarysearch></style>
<div id=dummyElement>Dummy element to test media queries.</div>
<script>
var mediaQueryMatches = function(property, r) {
  var style = document.getElementById('binarysearch');
  var dummyElement = document.getElementById('dummyElement');
  style.sheet.insertRule('@media (' + property + ':' + r +
                         ') {#dummyElement ' +
                         '{text-decoration: underline} }', 0);
  var matched = getComputedStyle(dummyElement, null).textDecoration
      == 'underline';
  style.sheet.deleteRule(0);
  return matched;
};
var mediaQueryBinarySearch = function(
    property, unit, a, b, maxIter, epsilon) {
  var mid = (a + b)/2;
  if (maxIter == 0 || b - a < epsilon) return mid;
  if (mediaQueryMatches(property, mid + unit)) {
    return mediaQueryBinarySearch(
        property, unit, mid, b, maxIter-1, epsilon);
  } else {
    return mediaQueryBinarySearch(
        property, unit, a, mid, maxIter-1, epsilon);
  }
};
var mozDevicePixelRatio = mediaQueryBinarySearch(
    'min--moz-device-pixel-ratio', '', a, b, maxIter, epsilon);
var ff35DevicePixelRatio = screen.width / mediaQueryBinarySearch(
    'min-device-width', 'px', 0, 6000, 25, .0001);
</script>

基本上，我们有:

devicepixelratio，它同时考虑了浏览器级别的缩放*以及系统缩放/像素密度。 *在Mac/Safari上不考虑缩放级别 媒体查询 vw/vh CSS单位 缩放级别更改时触发的Resize事件，会导致窗口的有效大小更改

这对于正常的用户体验来说应该足够了。如果你需要检测缩放级别，这可能是糟糕UI设计的标志。

音高变焦更难跟踪，目前还没有考虑。

这对我来说在基于webkit的浏览器(Chrome, Safari)中非常有效:

function isZoomed() {
    var width, mediaQuery;

    width = document.body.clientWidth;
    mediaQuery = '(max-width: ' + width + 'px) and (min-width: ' + width + 'px)';

    return !window.matchMedia(mediaQuery).matches;
}

但在Firefox中似乎不能正常工作。

这也适用于WebKit:

var zoomLevel = document.width / document.body.clientWidth;

你可以试试

var browserZoomLevel = Math.round(window.devicePixelRatio * 100);

这将给你的浏览器缩放百分比水平在非视网膜显示。对于高DPI/视网膜显示器，它将产生不同的值(例如，Chrome和Safari为200,Firefox为140)。

捕获缩放事件，您可以使用

$(window).resize(function() { 
// your code 
});

截至2016年1月，我有一个解决方案。在Chrome, Firefox和MS Edge浏览器中测试工作。

The principle is as follows. Collect 2 MouseEvent points that are far apart. Each mouse event comes with screen and document coordinates. Measure the distance between the 2 points in both coordinate systems. Although there are variable fixed offsets between the coordinate systems due to the browser furniture, the distance between the points should be identical if the page is not zoomed. The reason for specifying "far apart" (I put this as 12 pixels) is so that small zoom changes (e.g. 90% or 110%) are detectable.

参考: https://developer.mozilla.org/en/docs/Web/Events/mousemove

步骤:

添加一个鼠标移动监听器 窗口。addEventListener("鼠标移动"，函数(事件){ //处理事件 })； 从鼠标事件中捕获4个测量值: 事件。clientX、事件。clientY、事件。screenX, event.screenY 测量客户端系统中两点之间的距离d_c 测量屏幕系统中两点之间的距离d_s 如果d_c != d_s，则应用缩放。两者之间的差别告诉你缩放的大小。

注意:很少做距离计算，例如，当你可以采样一个新的鼠标事件，它离前一个事件很远的时候。

限制:假设用户将移动鼠标至少一点，缩放是不可知的，直到这个时候。