Js automatically generates sample code for properties of objects

For example, we have the following object

 
var obj = { a : { 
b:"bb" 
} 
} 

But now we want to add the following attribute to the obj object: obj.a.b.c.d.f="ff"; We usually do this, obj. A.B.C = {}, obj. A.B.C.D = {}, obj. A.B.C.D.F = "ff"; But if I have a lot of properties, this method won't work. We now provide a way to automatically generate object properties

 
function autoCreateObjProperty(temString){ 
var TemObjs = temString.split("."); 
for(var i =0;i<TemObjs.length;i++){ 
var ttt = TemObjs[i]; 
if(!obj.hasOwnProperty(TemObjs[i])){ 
var objString="obj"; 
for(var j= 1;j<=i;j++){ 
objString+="."+TemObjs[j]; 
} 

obj = eval(objString); 
if(obj == undefined){ 
var temObjString="obj"; //Object name var obj = {}
for(var j= 1;j<i;j++){ 
temObjString+="."+TemObjs[j]; 
} 
obj = eval(temObjString); 
obj[TemObjs[i]]={}; 
obj={}; 
} 
}else{ 
obj = obj[TemObjs[i]]; 
} 
} 
return obj; 

}