js如何设置浏览器缩放比例

1、sublime只是工具可以换其他编辑器 下面直接上代码

2、按钮触发事件这是缩小的效果点击查看

3、按钮触发事件这是放大的效果点击查看

4、 function 蟠校盯昂detectZoom (){ var ratio = 0, screen = win颊俄岿髭dow.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;};