今天小编跟大家讲解下有关手机横屏和竖屏情况下的图片旋转 ，相信小伙伴们对这个话题应该有所关注吧，小编也收集到了有关手机横屏和竖屏情况下的图片旋转 的相关资料，希望小伙伴们看了有所帮助。
图片渲染要解决的几个主要问题
1、图片默认是水平方向，要设置图片居中
max-height:100%;max-width:100%;position:absolute;left:50%;top:50%;transform:translate(-50%,-50%)"2、需要旋转的情况是：图片的宽度大于高度，这样旋转后图片显示的就大些
// 获取图片的实际宽度和高度var picWidth = $("#showPicContent").width(); var picHeight = $("#showPicContent").height();if( picWidth > picHeight) {}3、在旋转之前要确认好图片的大小，因为旋转后依然是以旋转前的图片的大小
var picRate = picWidth / picHeight;var windowRate = $(window).height() / $(window).width();console.log(picRate, windowRate)if (picRate <= windowRate) { PicMaxWidth = $(window).width() * picRate * 0.95} else { PicMaxWidth = $(window).height()}$("#showPicContent").css("max-width", PicMaxWidth)4、旋转的代码 要包含样式中设定的 translate(-50%,-50%)，否则会影响居中的效果
// 旋转的角度 顺时针为正，逆时针为负$("#showPicContent").css({"transform":"translate(-50%,-50%) rotate(90deg)"})5、判断手机横屏与竖屏状态
//判断手机横竖屏状态：function hengshuping() { //alert("hii") // window.orientation 只有在手机上才有，网页测试看不出效果 console.log(window.orientation); //$("#showPicContent").css({"transform":"translate(-50%,-50%) rotate(0deg)"}) if (window.orientation == 180 || window.orientation == 0) { //alert("竖屏状态！") $("#showPicContent").css("max-width", PicMaxWidth) $("#showPicContent").css({"transform":"translate(-50%,-50%) rotate(90deg)"}) } if (window.orientation == 90 || window.orientation == -90) { //alert("横屏状态！") $("#showPicContent").css("max-width","100%") $("#showPicContent").css({"transform":"translate(-50%,-50%) rotate(0deg)"}) }}window.addEventListener("onorientationchange"in window ?"orientationchange":"resize", hengshuping, false);完整的代码：实现点击一个图片显示蒙层，蒙层里面有一个图片 与一个关闭按钮
<div style="position:fixed;background:rgba(0,0,0,1.0);top:0;right:0;bottom:0;left:0;z-index:1000;font-size:20px;color:#fff;display:none;"class="backdrop"> <div style="position:absolute;right:10px;padding-top:5px;color:#f46608;cursor:pointer;z-index:100;"class="closePic">关闭</div> <img src="http://www.aidi.net.cn/article/detial/4346/../../dist/img/QQ图片20190604084934.jpg"id="showPicContent"style="max-height:100%;max-width:100%;position:absolute;left:50%;top:50%;transform:translate(-50%,-50%)"/></div><script>$("#showPic1").click(function() {if($(".backdrop").css("display") =="none") {$(".backdrop").css("display","block");}var picWidth = $("#showPicContent").width(); // 获取图片的实际宽度和高度var picHeight = $("#showPicContent").height();//var picWidth = $("#showPicContent").css("width")// 获取图片样式的宽度与高度//var picHeight = $("#showPicContent").css("height")console.log(picWidth, picHeight)if($(window).width() < 700) {if(picWidth > picHeight) {var PicMaxWidthvar picRate = picWidth / picHeight;var windowRate = $(window).height() / $(window).width();console.log(picRate, windowRate)if(picRate <= windowRate) {PicMaxWidth = $(window).width() * picRate * 0.95} else {PicMaxWidth = $(window).height()}$("#showPicContent").css("max-width", PicMaxWidth)$("#showPicContent").css({"transform":"translate(-50%,-50%) rotate(90deg)"})//判断手机横竖屏状态：function hengshuping() {//alert("hii")// window.orientation 只有在手机上才有，网页测试看不出效果console.log(window.orientation);//$("#showPicContent").css({"transform":"translate(-50%,-50%) rotate(0deg)"})if(window.orientation == 180 || window.orientation == 0) {//alert("竖屏状态！")$("#showPicContent").css("max-width", PicMaxWidth)$("#showPicContent").css({"transform":"translate(-50%,-50%) rotate(90deg)"})}if(window.orientation == 90 || window.orientation == -90) {//alert("横屏状态！")$("#showPicContent").css("max-width","100%")$("#showPicContent").css({"transform":"translate(-50%,-50%) rotate(0deg)"})}}window.addEventListener("onorientationchange"in window ?"orientationchange":"resize", hengshuping, false);}}})$("#showPicContent, .closePic").click(function() {if($(".backdrop").css("display") =="block") {$(".backdrop").css("display","none");}})</script>来源：爱蒂网
