如何实现图片垂直旋转90度的问题
非常简单的问题，一串代码就可以解决。复制修改一下就可以直接使用，一个简单的小demo。写项目的时候需要写的功能，不到二十行代码就可以实现。
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<html> <head><title>旋转图片</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name="viewport" content="initial-scale=1.0, user-scalable=no" /><style type="text/css">body, html{width: 100%;height: 100%;margin: 0;padding: 0;background-color: transparent;}/*包裹图片div样式*/#allDiv{font-family: "微软雅黑";font: 14px/1.8 arial;}/*图片样式*/.demoImg{background-color: Gray;border: none;margin-bottom: 50px;}.bottom{width: 100%;position: fixed;bottom: 10px;text-align: center;}.btn{cursor: pointer;width: 100px;height: 35px;background: rgba(38, 38, 38, 0.6);border: 0px;color: white;}</style> </head> <body><div id="allDiv" style="text-align: center;"><img id="demoImg" alt="图片" class="demoImg" src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1600861823902&di=29dac776c7336304cc69dc01983cc779&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201607%2F18%2F20160718205958_EzVsa.jpeg" /></div><div class="bottom"><div class="col-md-12 col-sm-12 col-xs-12 text-center"><button class="btn" type="button" onclick="SetImgRotate(0)" id="btnLeft">左旋转</button><button class="btn" type="button" onclick="SetImgRotate(1)" id="btnRight">右旋转</button></div></div><script type="text/javascript">//旋转图片var current = 0;function SetImgRotate(leftOrRight) {var img = document.getElementById('demoImg');if (leftOrRight == 0) {//左旋转current = (current - 90) % 360;}else if (leftOrRight == 1) {//右旋转current = (current + 90) % 360;}img.style.transform = 'rotate(' + current + 'deg)';}</script> </body> </html>