在HTML5 Canvas中放入图片和保存为图片的方法

// Converts image to canvas; returns new canvas element

  function convertImageToCanvas(image) {

  var canvas = document.createElement("canvas");

  canvas.width = image.width;

  canvas.height = image.height;

  canvas.getContext("2d").drawImage(image, 0, 0);</p>

<p> return canvas;

  }

// Converts canvas to an image

  function convertCanvasToImage(canvas) {

  var image = new Image();

  image.src = canvas.toDataURL("image/png");

  return image;

  }