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Javascript fabric.js和原型

[英]Javascript fabric.js and prototype

原文 2017-09-20 03:37:04 5 1 javascript/ fabricjs

In an example about Fabric.js available at: http://fabricjs.com/interaction-with-objects-outside-canvas 有关Fabric.js的示例，请参见： http ://fabricjs.com/interaction-with-objects-outside-canvas

The 3rd line reads: fabric.Object.prototype.transparentCorners = false; 第三行显示：fabric.Object.prototype.transparentCorners = false;

The property transparentCorners is already a property of the fabric.Object. 属性transparentCorners已经是fabric.Object的属性。 We are NOT adding it here. 我们不在这里添加它。

Why is there a need to add the word "prototype"? 为什么需要添加“原型”一词？ I don't get the reason. 我不知道原因。 Since we are NOT adding a new property to fabric.Object, wouldn't be the same to write: fabric.Object.transparentCorners = false; 由于我们没有在fabric.Object中添加新属性，因此编写起来就不会一样：fabric.Object.transparentCorners = false;

Please explain the difference. 请说明差异。

Thank you 谢谢

1 个解决方案

Adding the property ( modifying the value of the property ) on the fabric.Object prototype allows you to get that property set for each instance of the object and objects extended from that one already set to that default value. 在fabric.Object原型上添加属性（修改属性的值），您可以为每个对象实例获取该属性集，并将对象从已经设置为默认值的对象扩展。

So each fabric.Rect and fabric.Triangle will have the property transparentCorners set to false. 因此，每个fabric.Rect和fabric.Triangle都将属性transparentCorners设置为false。