jquery 判断浏览器缩放

function getZoomLevel() {
    var width = screen.width;
    var height = screen.height;
    var screenWidth = $(window).width();
    var screenHeight = $(window).height();

    var zoomWidth = width / screenWidth;
    var zoomHeight = height / screenHeight;

    return (zoomWidth + zoomHeight) / 2;
}

$(document).ready(function() {
    var zoomLevel = getZoomLevel();
    console.log("当前浏览器缩放级别: " + zoomLevel);
});

function getZoomLevel() {
    var devicePixelRatio = window.devicePixelRatio;
    var screenWidth = $(window).width();
    var screenHeight = $(window).height();

    var zoomWidth = screenWidth / (screen.width / devicePixelRatio);
    var zoomHeight = screenHeight / (screen.height / devicePixelRatio);

    return (zoomWidth + zoomHeight) / 2;
}

function getZoomLevel() {
    if ('visualViewport' in window) {
        return window.visualViewport.scale;
    } else {
        var devicePixelRatio = window.devicePixelRatio;
        var screenWidth = $(window).width();
        var screenHeight = $(window).height();

        var zoomWidth = screenWidth / (screen.width / devicePixelRatio);
        var zoomHeight = screenHeight / (screen.height / devicePixelRatio);

        return (zoomWidth + zoomHeight) / 2;
    }
}