[{"title":"(3个子文件2KB)编写程序,实现为一个文本文件,例如一个JAVA程序文件,添加行号。","children":[{"title":"fifth","children":[{"title":"Test.java <span style='color:#111;'>656B</span>","children":null,"spread":false},{"title":"Test.class <span style='color:#111;'>1.47KB</span>","children":null,"spread":false},{"title":"hello.txt <span style='color:#111;'>193B</span>","children":null,"spread":false}],"spread":true}],"spread":true}]