js实现圆形菜单选择器

时间：2021-05-26

本文实例为大家分享了js实现圆形菜单选择器的具体代码，供大家参考，具体内容如下

代码：

<head> <style> .mask{ position: absolute; width: 502px; height: 252px; left:300px; top:350px; background: white; z-index: 999; } .con { width: 500px; height: 500px; overflow: hidden; position: absolute; border-radius: 100%; border: 1px solid black; user-select: none; cursor: pointer; left: 300px; top: 100px; } .con>div { position: absolute; width: 250px; height: 250px; top: 0; left: 125px; text-align: center; font-size: 16px; transform-origin: bottom center; } .con1 { width: 400px; height: 400px; overflow: hidden; position: absolute; border-radius: 100%; border: 1px solid black; user-select: none; cursor: pointer; left: 350px; top: 150px; } .con1>div { position: absolute; width: 200px; height: 200px; top: 0; left: 100px; text-align: center; font-size: 16px; transform-origin: bottom center; } </style> <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" /></head> <body> <div class="mask"></div> <div class="con"> </div> <div class="con1"> </div> <script> conRender(); conRender1(); function conRender() { var con = document.querySelector(".con"); var len = 16; var deg = 360 / len; for (var i = 0; i < len; i++) { var dom = document.createElement("div"); dom.style.transform = "rotate(-" + i * deg + "deg)"; dom.innerHTML = "财务管理" + i; dom.setAttribute("index", i) con.appendChild(dom) } var mouseDown = false; var startX = 0; var startY = 0; var endX = 0; var endY = 0; var rotate = 0; con.addEventListener("mousedown", function (e) { mouseDown = true; startX = e.pageX; startY = e.pageY; }, false); con.addEventListener("mousemove", function (e) { if (mouseDown) { endX = e.pageX; endY = e.pageY; var distance = Math.sqrt(Math.pow((endX - startX), 2) + Math.pow((endY - startY), 2)) if (endX - startX < 0 || endY - startY < 0) { distance = -distance } rotate += distance con.style.transform = "rotate(" + (rotate / 4) + "deg)"; startX = e.pageX; startY = e.pageY; var index = Math.round((rotate / 4) / deg); var cons = document.querySelectorAll(".con>div") for (var i = 0, len = cons.length; i < len; i++) { cons[i].style.color = "black" } document.querySelector("div[index=\"" + index % len + "\"]").style.color = "red" document.querySelector(".con1").style.transform = "rotate(" + (rotate) + "deg)"; } }, false); document.addEventListener("mouseup", function (e) { mouseDown = false; }, false); } function conRender1() { var con = document.querySelector(".con1"); var len = 13; var deg = 360 / len; for (var i = 0; i < len; i++) { var dom = document.createElement("div"); dom.style.transform = "rotate(-" + i * deg + "deg)"; dom.innerHTML = "财务管理" + i; dom.setAttribute("index1", i) con.appendChild(dom) } var mouseDown = false; var startX = 0; var startY = 0; var endX = 0; var endY = 0; var rotate = 0; con.addEventListener("mousedown", function (e) { mouseDown = true; startX = e.pageX; startY = e.pageY; }, false); con.addEventListener("mousemove", function (e) { if (mouseDown) { endX = e.pageX; endY = e.pageY; var distance = Math.sqrt(Math.pow((endX - startX), 2) + Math.pow((endY - startY), 2)) if (endX - startX < 0 || endY - startY < 0) { distance = -distance } rotate += distance con.style.transform = "rotate(" + (rotate / 4) + "deg)"; startX = e.pageX; startY = e.pageY; var index = Math.round((rotate / 4) / deg); var cons = document.querySelectorAll(".con1>div") for (var i = 0, len = cons.length; i < len; i++) { cons[i].style.color = "black" } document.querySelector("div[index1=\"" + index % len + "\"]").style.color = "red" } }, false); document.addEventListener("mouseup", function (e) { mouseDown = false; }, false); } </script></body> </html>

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