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;  }