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Simple JS multiple inheritance example_javascript skills

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Release: 2016-05-16 19:05:44
Original
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复制代码 代码如下:

$defined = function (v) {
    return v != undefined;
}

Class = function () {
    var base = {};
    for (var k=0; k    //{{new arguments[k]() with custom constructor field.
        var o = arguments[k].prototype;
        o.constructor = arguments[k];
        arguments[k].call(o);
    //}}
        for (key in o) base[key] = o[key];
    }
    function Klass () {
        // for every class one object cache.
        var clso = null;
        function klass() {
            if (arguments.length<=0 && clso!=null) {
                // hit cache.
                return clso;
            }
            if ($defined(this.constructor.init)) {
                // use init() for class initialization.
                this.constructor.init.apply(this, arguments);
            }
            clso = this;
        }
        klass.prototype = base;
        return klass;
    }
    return Klass();
}

A = new Class();
A.init = function () {
    this.x = 400;
    this.y = 300;
}
B = new Class(A);
B.init = function () {
    this.y = 200;
    this.z = 100;
}
C = new Class(B);
C.init = function () {
    this.z = 0;
}
c = new C();
alert(c.x);
alert(c.y);
alert(c.z); 
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