页面里面可以随意植入html代码，会不会有人利用这个做那些全屏蔽的html代码，影响用户的浏览？
CSS 加载动画body { background-color: #222; } #preloader { position: fixed; top: 0; left: 0; width: 100%; height: 100%; } #loader { display: block; position: relative; left: 50%; top: 50%; width: 150px; height: 150px; margin: -75px 0 0 -75px; border-radius: 50%; border: 3px solid transparent; border-top-color: #9370DB; -webkit-animation: spin 2s linear infinite; animation: spin 2s linear infinite; } #loader:before { content: ""; position: absolute; top: 5px; left: 5px; right: 5px; bottom: 5px; border-radius: 50%; border: 3px solid transparent; border-top-color: #BA55D3; -webkit-animation: spin 3s linear infinite; animation: spin 3s linear infinite; } #loader:after { content: ""; position: absolute; top: 15px; left: 15px; right: 15px; bottom: 15px; border-radius: 50%; bor
