Question

 var a="1";
 b={a:a},

the b variant isn’t {“1”:1},why will this happened?

also want to know if i want to get the result what i want ,how can i solve this problem

Answer 1

JavaScript has a syntax quirk where the bit on the left-hand side of the : in an object literal isn’t an expression like the bit on the right-hand side.

It can be either a quoted string literal, or an identifier token. In the case of an identifier, the token is taken verbatim, as if it were a quoted string. So {a:"1"} is the same as {"a":"1"}.

If you want to use an expression as a property name, you have to do so using the [] property access operator:

var b= {};
b[a]= a;