javascript - 如何从对象函数javascript返回多个值？

Question

我想知道是否可以从原型(prototype)对象返回多个值。我需要返回几个数组的值并稍后调用它们。下面是我的代码示例。如果需要，我可以显示 JSFiddle。谢谢!!

 EmployeeObj.prototype.showEmployee = function(emPhoto0,emPhoto01){
     var employeePhoto = new Array();
     employeePhoto[emPhoto0] = new Image();
     employeePhoto[emPhoto0].src = "pics/taylor.jpg";
     employeePhoto[emPhoto01] = new Image();
     employeePhoto[emPhoto01].src = "pics/roger.jpg";

     var showPhoto1 = employeePhoto[emPhoto0];
     var showPhoto2 = employeePhoto[emPhoto1];

     return showPhoto1;
     return showPhoto2;
 };

Answer 1

您不能以这种方式使用多个 return 语句 - 只有第一个计算才会发生，但您可以返回一个对象或数组，并从中获取您想要的内容。

EmployeeObj.prototype.showEmployee = function (emPhoto0, emPhoto01) {
    var employeePhoto = new Array();
    employeePhoto[emPhoto0] = new Image();
    employeePhoto[emPhoto0].src = "pics/taylor.jpg";
    employeePhoto[emPhoto01] = new Image();
    employeePhoto[emPhoto01].src = "pics/roger.jpg";
    var showPhoto1 = employeePhoto[emPhoto0];
    var showPhoto2 = employeePhoto[emPhoto1];
    return {'showPhoto1': showPhoto1, 'showPhoto2': showPhoto2};
    // or [showPhoto1, showPhoto2];
};

然后您可以通过以下方式访问

var em = new EmployeeObj(/* ... */),
    photos = em.showEmployee(/* ... */);
photos['showPhoto1']; // or photos['showPhoto2']
// or photos[0], photos[1], if you used the Array version