HTMLCanvasElement.width - Web APIs 编辑

The HTMLCanvasElement.width property is a positive integer reflecting the width HTML attribute of the <canvas> element interpreted in CSS pixels. When the attribute is not specified, or if it is set to an invalid value, like a negative, the default value of 300 is used.

This is one of the two properties, the other being HTMLCanvasElement.height, that controls the size of the canvas.

Syntax

var pxl = canvas.width;
canvas.width = pxl;

Examples

Given this <canvas> element:

<canvas id="canvas" width="300" height="300"></canvas>

You can get the width of the canvas with the following code:

var canvas = document.getElementById('canvas');
console.log(canvas.width); // 300

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• The interface defining it, HTMLCanvasElement.
• The other property controlling the size of the canvas, HTMLCanvasElement.height.