使用JavaScript多态在子类中创建唯一变量而不覆盖

I want to use item.create() in projectModule, testCase and businessFunction. because it's same prototype as item's I copied the item's to other functions. But i want have a one unique variable for these three functions which is called itemType. I tried this. But an exception is occurred. How can I place a unique variable for these three functions without overriding them?

我想在projectModule,testCase和businessFunction中使用item.create()。因为它与项目的原型相同,我将项目复制到其他功能。但是我希望这三个函数有一个唯一的变量叫做itemType。我试过这个。但是发生了一个例外。如何在不覆盖它们的情况下为这三个函数放置一个唯一变量?

Exception:

projectModule.create.prototype.itemType = 'module';
TypeError: Cannot read property 'prototype' of undefined

JavaScript Code

 var item = function () {};
    item.prototype.create = function (projectName, itemName) {
      console.log(projectName);
      console.log(itemName);
      console.log(itemType);
    };


/**
 * create module
 */
var projectModule = function () {};
projectModule.prototype = Object.create(item.prototype);
projectModule.create.prototype.itemType = 'module';

/**
 * create tc
 */
var testCase = function () {};
testCase.prototype = Object.create(item.prototype);
testCase.create.prototype.itemType = 'tc';


/**
 * create bc
 */
var businessComponent = function () {};
businessComponent.prototype = Object.create(item.prototype);
businessComponent.create.prototype.itemType = 'bc';

1 个解决方案

#1

This seems to have solved the error for me. Swapped .create and .prototype around.

这似乎解决了我的错误。交换.create和.prototype。

var projectModule = function () {};

projectModule.prototype = Object.create(item.prototype);
projectModule.prototype.create.itemType = 'module';

/**
 * create tc
 */
var testCase = function () {};
testCase.prototype = Object.create(item.prototype);
testCase.prototype.create.itemType = 'tc';


/**
 * create bc
 */
var businessComponent = function () {};
businessComponent.prototype = Object.create(item.prototype);
businessComponent.prototype.create.itemType = 'bc';

1 个解决方案

#1

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