JavaScript请求对象-将键作为变量转换为字符串

Question

I'm a programming beginner.

API post call accepts object variable (derived from variable) as a string as follows

"option": 
    {           
  "235": “30”
},
 {           
    "238": “32”
}

My code angular 6

  option = [];
  ---

    this.option.push({
      [option.product_option_id]: $event
    });

which result

 option = [ {
   235: 30
 }]

but need this variable in double-quoted "235".

please help

Answer 1

but need this variable in double-quoted "235"

By which you mean that you need it to be a string .

Don't worry, it is. When you use a number as a property name, it's converted to a string automatically. Property names can only be strings or Symbols, so things that aren't strings or Symbols get converted to string:

 class Example { constructor() { this.option = []; const option = { product_option_id: 42 }; const $event = {}; this.option.push({ [option.product_option_id]: $event }); const pushed = this.option[0]; for (const key of Object.keys(pushed)) { console.log(`${key}: ${typeof key}`); } } } new Example(); 

That said, the expression within the [] of a computed property name is just that: an expression. So if you wanted to be explicit, you could use String there:

option.push({
  [String(option.product_option_id)]: $event
});