{"html":"<!DOCTYPE html>\n<html>\n\n<head>\n    <meta charset=\"UTF-8\">\n    <style>\n       /* 填写样式 */\n       div{\n   \n     width:100px;\n     height:100px;\n       border-radius:50px;\n        border:1px solid black;\n       }\n    </style>\n</head>\n\n<body>\n  <div></div> \n    <script type=\"text/javascript\">\n        /* 填写JavaScript */\n        \n    </script>\n</body>\n\n</html>","css":"","js":""}

div{

width:100px;

height:100px;//会形成一个正方形

border:1px solid #000;//设置边框

border-radius:50px;//将正方形设置为圆

}