{} And function () {} use an empty object {} to store keyValue_javascript skills

Although everything in js can be an object, you can use the cramming method to add attributes to the object and assign values to attributes. however, some js built-in objects and type attributes cannot be overwritten are also greedy and mandatory. A js tool class that uses url operations has a property called queryString, my original practice was to make queryString = function (){},

The idea is to use either of the queryString [key] Or queryString (key [, value]) Write methods to call the key case-sensitive method using queryString [key ].

The queryString (key) method is case-insensitive.

Today, I found that none of the URLs contain the name parameter. Suddenly, queryString is an anonymous function, and the attributes such as name and length are read-only,

You can use another param (key [, value]) to implement the case-insensitive function.

The conclusion today is that it is better not to use function () {} to store keyValue for fields that have built-in attributes.