JavaScript Definition Modifying property values

Some would say there's something better foo[' a '] = ' B '; FOO.A = 100; It's too easy.

The following object.defineproperty is introduced here because it can set permissions for properties

For example, we need to set a property of Foo object to be non-enumerable

var foo = {      ' tom '  name ', {    value:' Jack ',    Enumerable: false });

Here the first parameter is the object the second is the property of the key The third argument is the description of the property

We don't want a property of the object to be erased.

Object.defineproperty (demo, ' Foobar ', {    value:"Hello",    false});

And so on can be achieved

But DefineProperty is a ES5 feature IE8 the following are not supported

JavaScript Definition Modifying property values