1.创建js文件
DevicePixelRatio
class DevicePixelRatio {
constructor() {
//this.flag = false;
}
//获取系统类型
_getSystem() {
// eslint-disable-next-line no-unused-vars
let flag = false;
var agent = navigator.userAgent.toLowerCase();
// var isMac = /macintosh|mac os x/i.test(navigator.userAgent);
// if(isMac) {
// return false;
// }
//现只针对windows处理，其它系统暂无该情况，如有，继续在此添加
if (agent.indexOf("windows") >= 0) {
return true;
}
}
//获取页面缩放比例
// _getDevicePixelRatio() {
// let t = this;
// }
//监听方法兼容写法
_addHandler(element, type, handler) {
if (element.addEventListener) {
element.addEventListener(type, handler, false);
} else if (element.attachEvent) {
element.attachEvent("on" + type, handler);
} else {
element["on" + type] = handler;
}
}
//校正浏览器缩放比例
_correct() {
// eslint-disable-next-line no-unused-vars
let t = this;
//页面devicePixelRatio（设备像素比例）变化后，计算页面body标签zoom修改其大小，来抵消devicePixelRatio带来的变化。
document.getElementsByTagName('body')[0].style.zoom = 1 / window.devicePixelRatio;
}
//监听页面缩放
_watch() {
let t = this;
t._addHandler(window, 'resize', function() { //注意这个方法是解决全局有两个window.resize
//重新校正
t._correct()
})
}
//初始化页面比例
init() {
let t = this;
if (t._getSystem()) { //判断设备，目前只在windows系统下校正浏览器缩放比例
//初始化页面校正浏览器缩放比例
t._correct();
//开启监听页面缩放
t._watch();
}
}
}
export default DevicePixelRatio;
显示页面组件
import DevicePixelRatio from '../DevicePixelRatio'
created(){
new DevicePixelRatio()
}
mounted(){
window.onresize=()=>{
return (()=>{
this.detectZoom()
})()
}
},
methods:{
detectZoom (){
var 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);
}
//ratio就是获取到的百分比
console.log(ratio)
this.onresize_height = ratio
// return ratio;
},
}
/* 子集盒子的class */ .box { /*父级宽100vw，高100vh。子盒子宽高1920*1080可以做大屏显示居中缩放 */ width: 100vw; height: 100vh; background-color: red; color: #fff; /* 更改转换元素的位置 transform-origin: left top; */ /* 超出隐藏 */ overflow-y: hidden; } html,body{ width: 100%; height: 100%; overflow-x:hidden; overflow-y:hidden; }
