使用javascript设置Canvas大小

Question

我在html中有以下代码:

<canvas  id="myCanvas" width =800 height=800>

我希望,而不是指定widthas 800,调用JavaScript函数getWidth() 来获取宽度,例如

 <canvas  id="myCanvas" width =getWidth() height=800>

这样做的正确语法是什么？因为我正在做的事不起作用.

Answer 1

您可以像这样设置宽度:

function draw() {
  var ctx = (a canvas context);
  ctx.canvas.width  = window.innerWidth;
  ctx.canvas.height = window.innerHeight;
  //...drawing code...
}

Answer 2

function setWidth(width) {
  var canvas = document.getElementById("myCanvas");  
  canvas.width = width;
}

Answer 3

试试这个:

var setCanvasSize = function() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}