js 采用delete实现继承示例代码_javascript技巧

//采用对象冒充的方式实现js继承
function A(color) {
this.Acolor = color;
this.AshowColor = function() {
document.writeln("Acolor: " + this.Acolor);
}
}

function B(color, name) {
//将newMethod赋值A，调用A的构造函数
this.newMethod = A;
this.newMethod(color);
//然后删除对A的引用,这样以后不能调用他
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("----------------");