使用图片作为图片保存HTML5画布 [英] Save HTML5 canvas with images as an image

问题描述

我尝试使用图片将画布保存到PNG，但是当我尝试这样做时：

I'm trying to save a canvas with images to PNG, but when I try this:

var myCanvas = document.getElementById("myCanvas");
var img = document.createElement('img');
var ctx = myCanvas.getContext ? myCanvas.getContext('2d') : null;
img.src = 'image.png';

img.onload = function () {  
    ctx.drawImage(img, 0, 0, myCanvas.width, myCanvas.height);
}

var data = myCanvas.toDataURL("image/png");
if (!window.open(data)) {
    document.location.href = data;
}

我只得到一个没有图像的空白透明图像。

I only get a blank transparent image without the image. What am I doing wrong?

推荐答案

您需要将 window.open

You need to put the window.open call in the load handler since this happens asynchronously.

img.onload = function () {  
    ctx.drawImage(img, 0, 0, myCanvas.width, myCanvas.height);

    var data = myCanvas.toDataURL("image/png");
    if (!window.open(data)) {
        document.location.href = data;
    }
}

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