Paper.js中的事件处理程序(Event handlers in Paper.js)

 我是Paper.js的新手，在阅读教程的同时，我对事件系统感到惊奇。 多数民众赞成在教程中描述的事件： 
 
var path;
function onMouseDown(event) {
    // Create a path:
    path = new Path();
    path.strokeColor = 'black';
    // Add the mouse down position:
    path.add(event.point);
}

function onMouseUp(event) {
    // Add the mouse up position:
    path.add(event.point);
}
 
 所以，它在全局命名空间中的正义功能...... 
 最终我对此有几个问题，并且我没有在网上找到任何关于此的问题： 
 如何将事件处理程序绑定到特定的画布？ 
 - 如何将事件处理程序绑定到特定的“对象”（光栅图像，矩形等）？ 
 - 如何绑定多个事件处理程序？ 

I am new to Paper.js, and I was wondered by the event system, while reading tutorial. Thats how event hanling described in tutorial:
 
var path;
function onMouseDown(event) {
    // Create a path:
    path = new Path();
    path.strokeColor = 'black';
    // Add the mouse down position:
    path.add(event.point);
}

function onMouseUp(event) {
    // Add the mouse up position:
    path.add(event.point);
}
 
So, its just functions in global namespace...
 Eventually I have a few questions about it, and I didnt found anything on the internet on this:
 - How to bind event handler to particular canvas?
 - How to bind event handler to particular "object" (raster image, rectangle, etc)?
 - How to bind multiple event handlers to something?

原文：https://stackoverflow.com/questions/19788760