js中把jsonAarray递归的方法转成树形的json对象

一个json 数组 var nodes = [ {"id":2,"title":"第一级1","parentid":0}, {"id":3,"title":"第二级1","parentid":2}, {"id":4,"title":"第二级2","parentid":2}, {"id":5,"title":"第三级1","parentid":4},

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