从字符串层次结构创建JSON树。

Given these 4 variables,

鉴于这四个变量,

var el1 = {name:'ronaldo', team: 'europe/spain/realmadrid'}
var el2 = {name:'messi', team: 'europe/spain/barcelona'}
var el3 = {name:'gerald', team: 'europe/england/liverpool'}
var el4 = {name:'unknown english', team: 'europe/england'}
var el1 =