Recursion object is empty-CodePudding

 & lt; script> 
Var data=https://bbs.csdn.net/topics/[{
Id: 1, 
Name: 'home appliances' 
Goods: [{
Id: 11, 
Gname: 'fridge, 
Goods: [{
Id: 111, 
Gname: 'haier' 
}, {
Id: 112, 
Gname: 'beauty' 
},] 
}, {
Id: 12, 
Gname: 'washing machine' 
}] 
}, {
Id: 2, 
Name: 'clothing' 
}]; 
//we want to do the input id number, you can return the data object 
//1. Use a forEach to traverse the inside of each object 
The function getID (json, id) {
Var o={} 
{json. ForEach (function (a) 
If (Anderson, d==id) {
console.log(a); 
O=a; 
}
Else if (al-qeada oods& & Atul gawande oods. Length> 0 {
GetID (al-qeada oods, id) 
}
}) 
return o; 
}
//the console. The log (getID (data, 1)); 
The console. The log (getID (data, 11)); 
//getID (data, 11); 
</script>

Why the last o object is not assignment in it?

CodePudding user response:

Because you are second in the recursive call getID (al-qeada oods, id) the return value of not receiving and return to a layer,
Returns the result in the recursive to one layer up back to the original call,

CodePudding user response:

Else if, to o=getID (al-qeada oods, id)//the return value is assigned to the recursion o, finally return to o