Resolving Image Saving Issues with canvas.toDataURL()

When attempting to utilize canvas.toDataURL() to save a canvas as an image, you may encounter difficulties. Here's how to approach the situation:

问题与解决方案

问题：

以下是用于保存画布图像的代码，但它不起作用：

// Canvas named "canvasSignature"

JavaScript:

function putImage() {
  var canvas1 = document.getElementById("canvasSignature");
  if (canvas1.getContext) {
    var ctx = canvas1.getContext("2d");
    var myImage = canvas1.toDataURL("image/png");
  }
  var imageElement = document.getElementById("MyPix");
  imageElement.src = myImage;
}

HTML5:


  Save as Image

解决方案：

代码中缺少将图像转换为二进制流的步骤。修改代码为：

var image = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");

window.location.href = image; // Save locally

通过将图像转换为二进制流并将其视为文件，代码可以本地保存该图像。