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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="utf-8">
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+ <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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+ <title>浏览器网页内容的百分比缩放（按Ctrl和+号键或者-号键的缩放）</title>
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+ <style type="text/css">
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+ </style>
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+ </head>
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+ <body>
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+ <a href="javascript:;" id="openApp">知乎客户端</a>
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+ <input type="text" name="ee" autocomplete="on">
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+ </body>
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+ </html>
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+ <script src="js/jquery/jquery-3.2.1.min.js"></script>
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+<script type="text/javascript">
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+// 判断pc浏览器是否缩放，若返回100则为默认无缩放，如果大于100则是放大，否则缩小
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+function detectZoom (){
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+ var ratio = 0,
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+ screen = window.screen,
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+ ua = navigator.userAgent.toLowerCase();
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+
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+ if (window.devicePixelRatio !== undefined) {
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+ ratio = window.devicePixelRatio;
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+ }
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+ else if (~ua.indexOf('msie')) {
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+ if (screen.deviceXDPI && screen.logicalXDPI) {
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+ ratio = screen.deviceXDPI / screen.logicalXDPI;
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+ }
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+ }
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+ else if (window.outerWidth !== undefined && window.innerWidth !== undefined) {
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+ ratio = window.outerWidth / window.innerWidth;
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+ }
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+
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+ if (ratio){
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+ ratio = Math.round(ratio * 100);
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+ }
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+
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+ return ratio;
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+};
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+//window.onresize 事件可用于检测页面是否触发了放大或缩小。
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+$(function(){
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+ //alert(detectZoom())
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+})
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+$(window).on('resize',function(){
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+ isScale();
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+});
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+//判断PC端浏览器缩放比例不是100%时的情况
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+function isScale(){
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+ var rate = detectZoom();
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+ if(rate != 100){
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+ //如何让页面的缩放比例自动为100,'transform':'scale(1,1)'没有用，又无法自动条用键盘事件，目前只能提示让用户如果想使用100%的比例手动去触发按ctrl+0
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+ console.log(1)
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+ alert('当前页面不是100%显示，请按键盘ctrl+0恢复100%显示标准，以防页面显示错乱！')
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+ }
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+}
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+
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+//阻止pc端浏览器缩放js代码
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+//由于浏览器菜单栏属于系统软件权限，没发控制，我们着手解决ctrl/cammond + +/- 或 Windows下ctrl + 滚轮 缩放页面的情况，只能通过js来控制了
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+ // jqeury version
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+$(document).ready(function () {
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+ // chrome 浏览器直接加上下面这个样式就行了，但是ff不识别
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+ $('body').css('zoom', 'reset');
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+ $(document).keydown(function (event) {
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+ //event.metaKey mac的command键
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+ if ((event.ctrlKey === true || event.metaKey === true)&& (event.which === 61 || event.which === 107 || event.which === 173 || event.which === 109 || event.which === 187 || event.which === 189)){
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+ event.preventDefault();
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+ }
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+ });
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+ $(window).bind('mousewheel DOMMouseScroll', function (event) {
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+ if (event.ctrlKey === true || event.metaKey) {
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+ event.preventDefault();
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+ }
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+ });
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+});
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+</script>
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