js uses delete to implement inheritance sample code_javascript skills

Copy code The code is as follows:

//Use object impersonation to implement js inheritance
function A (color) {
this.Acolor = color;
this.AshowColor = function() {
document.writeln("Acolor: " this.Acolor);
}
}

function B(color, name) {
//Assign newMethod to A and call A’s constructor
this.newMethod = A;
this.newMethod(color);
/ /Then delete the reference to A so that he cannot be called later
delete this.newMethod;

this.Bname = name;
this.BshowName = function() {
document.writeln ("Bname: " this.Bname);
}
}

var objA = new A("red");
objA.AshowColor();
document.writeln ("----------------");
var objB = new B("black", "demo");
objB.AshowColor();
objB.BshowName();
document.writeln("----------------");