JavaScript:如何将单个全局对象传递给一组类？

Question

我有一组全局对象。这些全局变量可以有不同的设置。

var s1 = {
    test1: 10,
    test2: 20
}

var s2 = {
    test1: 10,
    test2: 50
}
...

我有一组使用这些对象进行 self 配置的类。它们可能看起来像这样:

var classA = function(s) {
    this.pA1 = s.test1 + s.test2;
    this.pA2 = Math.sqrt(s.test1);
}

var classB = function(s) {
    this.pB1 = s.test1 * s.test2;
    this.pB2 = s.test1 + s.test2 - s.test1 * s.test2;
}
...

这些类的实例是:

var iA1 = new classA(s1);
var iB1 = new classB(s1);
...

var iA2 = new classA(s2);
var iB2 = new classB(s2);
...

实际上，我有更多设置、类和实例。

如何在不每次传递参数的情况下做到这一点？

Answer 1

function factory(s) {
    return {
        iA: new classA(s),
        iB: new classB(s),
        iC: new classC(s),
        iD: new classD(s)
    };
}

var set1 = factory(s1),
    set2 = factory(s2),
    ...

或者:

function factory(constructors, arg1, arg2) {
    var res = {};
    for (var i in constructors) {
        var ctor = constructors[i];
        res[ctor.name] = new ctor(arg1, arg2);
    }
    return res;
}

var constructors = [ classA, classB, classC ];
var set1 = factory(constructors, s1),
    set2 = factory(constructors, s2),
    ...