js实现添加删除一行。每一行下面可以再添加一行。序号自动改变

[{"title":"（ 16 个子文件 236KB ） js实现添加删除一行。每一行下面可以再添加一行。序号自动改变","children":[{"title":"xitong","children":[{"title":"css","children":[{"title":"style.css <span style='color:#111;'> 1.50KB </span>","children":null,"spread":false}],"spread":true},{"title":"images","children":[{"title":"jian.jpg <span style='color:#111;'> 18.34KB </span>","children":null,"spread":false},{"title":"img1.jpg <span style='color:#111;'> 19.32KB </span>","children":null,"spread":false},{"title":"img2-1.jpg <span style='color:#111;'> 21.23KB </span>","children":null,"spread":false},{"title":"img2.jpg <span style='color:#111;'> 20.52KB </span>","children":null,"spread":false},{"title":"img1-1.jpg <span style='color:#111;'> 20.11KB </span>","children":null,"spread":false},{"title":"down.jpg <span style='color:#111;'> 18.07KB </span>","children":null,"spread":false},{"title":"img4.jpg <span style='color:#111;'> 19.57KB </span>","children":null,"spread":false},{"title":"jia.jpg <span style='color:#111;'> 18.41KB </span>","children":null,"spread":false},{"title":"img3-1.jpg <span style='color:#111;'> 20.55KB </span>","children":null,"spread":false},{"title":"img4-1.jpg <span style='color:#111;'> 20.35KB </span>","children":null,"spread":false},{"title":"7.jpg <span style='color:#111;'> 112.65KB </span>","children":null,"spread":false},{"title":"img3.jpg <span style='color:#111;'> 19.83KB </span>","children":null,"spread":false}],"spread":false},{"title":"index.html <span style='color:#111;'> 3.97KB </span>","children":null,"spread":false},{"title":"js","children":[{"title":"jquery.js <span style='color:#111;'> 5.05KB </span>","children":null,"spread":false},{"title":"jquery-1.8.3.js <span style='color:#111;'> 261.46KB </span>","children":null,"spread":false}],"spread":true}],"spread":true}],"spread":true}]