A css3-based Loading, pure js, does not depend on Jquery, is compatible with all browsers that support H5, css and js files are only 5.7KB in total size, support for custom loading colors, mask colors, loading fade and animation times and loading The Applicability is strong, easy to use.(一个基于css3的加载Loading,用于ajax等耗时操作的阻塞。纯js编写,不依赖Jq