javascript - Why an object key's first value is treated as a string - AngularJs -

i have object named "param" , has key named "item[]". values of item[] inserted dynamically.

problem when "item[]" has single value, treats value string , not first index of array.

example :

item[]="123"; 

but when has multiple values treats array desired, example-

item[] = ["123","456"]; 

i want single value index of array

item[] = ["123"] 

how ?

p.s. - object created querystring parameters http://example.com/def?item[]=123&item[]=456, when extract querystring, returns these parameters keys of object

i extracting querystring in way(javascript)-

var param = $location.search(); console.log('param');       console.log(param);//returns object{item[]=[2]} in console 

this because variablename[] not javascript syntax.
since not recognise [], part of name if not throw error.

to create array, have 2 possibilities :

//contsructor var ar = new array(); //empty array //literal var ar = []; //same above var ar = [0,1,2,3]; //array of length 4 var ar = new array(4); //empty array of length 4 

to access or set it

var ar[0] = "value"