如何获取HTML5画布的宽度和高度？ [英] How do I get the width and height of a HTML5 canvas?

问题描述

如何在JavaScript中获取canvas元素的宽度和高度？

此外，我继续阅读的画布的上下文是什么？ / p>

解决方案

这可能值得一看教程：

您可以通过访问canvas元素的宽度和高度来获取canvas元素的宽度和高度。属性的元素。例如：

  var canvas = document.getElementById（'mycanvas'）; 
 var width = canvas.width; 
 var height = canvas.height; 
  

上下文是从画布中获取的一个对象， >

How can i get the width and height of the canvas element in JavaScript?

Also, what is the "context" of the canvas I keep reading about?

解决方案

It might be worth looking at a tutorial: Firefox Canvas Tutorial

You can get the width and height of a canvas element simply by accessing those properties of the element. For example:

var canvas = document.getElementById('mycanvas');
var width = canvas.width;
var height = canvas.height;

The context is an object you get from the canvas to allow you to draw into it.

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