javascript大小写转化

Question

var obj = { 
"a": 1, 
"b": 2, 
"c": 3 
}; 
如何将obj中a,b,c转换成大写？

Answer 1

  let obj1 =Object.create(obj);  for ( i in obj1){    let I = i.toUpperCase();    obj1[I] = obj[i];  }