getter and setter are cool.
you can call the function
() to execute parentheses.
when we create an object constructor Person :
function Person(value) {
this.counter = value;
} We can add a getter or setter method to the object constructor Person :
Person.prototype = {
get increment () {
this.counterPP;
}
} so that when we new Person , we can call increment
() .
var person = new Person(3)
person.increment
console.log(person.counter) // 4question:
In the same way, when we new an array, we add a getter to the array in the same way.
Array.prototype = {
get increment() {
this[0]PP;
}
}
var arr = new Array(1,3);
arr.increment
console.log(arr) // Array(2)[ 1,3 ] the grammar didn"t make a mistake, but it didn"t work.
I wonder why?
but when you write it as a method, it"s actually effective
.Array.prototype.increment = function() {
this[1]PP;
}
var arr = new Array(1,3);
arr.increment()
console.log(arr) // Array(2)[ 1,4 ]