进度显示等级（带动画）

[{"title":"（ 2118 个子文件 15.25MB ） 进度显示等级（带动画）","children":[{"title":"gradlew.bat <span style='color:#111;'> 2.35KB </span>","children":null,"spread":false},{"title":"gradlew <span style='color:#111;'> 4.85KB </span>","children":null,"spread":false},{"title":"gradle.properties <span style='color:#111;'> 747B </span>","children":null,"spread":false},{"title":"jieshao.png <span style='color:#111;'> 15.63KB </span>","children":null,"spread":false},{"title":"index <span style='color:#111;'> 4.54KB </span>","children":null,"spread":false},{"title":"......","children":null,"spread":false},{"title":"<span style='color:steelblue;'>文件过多，未全部展示</span>","children":null,"spread":false}],"spread":true}]