Javascript代码的小小疑问11.16——Array.from()

Question

 let obj = ["x","y","z"];
 let objTmp = {};
  Array.from(obj,(o)=>{
    console.log(o+1);
});   //x1,y1,z1

我想得到如下形式：

{x1:'', y1:"",z1:''}, 但不行，How?

 let obj = ["x","y","z"];
 let objTmp = {};
  Array.from(obj,(o)=>{
    Object.assign(objTmp, o+1);
});
console.log( objTmp);   //{"0":z, "1":1}