Canvas 声明与获取

Canvas Html 声明

<canvas id="myCanvas" width="600" height="300"></canvas>

Notes: 如果未指明 canvas 的宽和高,则默认为 300px 和 150px

Canvas 对象获取

获取 CanvasRenderingContext2D 对象:

var ctx = document.getElementById('canvas').getContext('2d');

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