Javascript 绘制图片并保存它而不显示它
我想做的是在另一张图片上画一张png图片,我已经用canvas成功地完成了,然后我可以将它保存为一个新的png文件Javascript 绘制图片并保存它而不显示它,javascript,html5-canvas,node-webkit,Javascript,Html5 Canvas,Node Webkit,我想做的是在另一张图片上画一张png图片,我已经用canvas成功地完成了,然后我可以将它保存为一个新的png文件 var drawImage = function(canvas, base, overlay){ var context = canvas.getContext('2d'); context.clearRect(0, 0, canvas.width, canvas.height);
var drawImage = function(canvas, base, overlay){
var context = canvas.getContext('2d');
context.clearRect(0, 0, canvas.width, canvas.height);
var baseImage = new Image();
var overlayImage = new Image();
var readyFlag = 0;
var drawFunc = function () {
context.drawImage(baseImage, 0, 0, canvas.width, canvas.height);
context.drawImage(overlayImage, 0, 0);
}
baseImage.onload = function () {
readyFlag += 1;
if (readyFlag < 2) {
return;
}
drawFunc();
}
overlayImage.onload = function () {
readyFlag += 1;
if (readyFlag < 2) {
return;
}
drawFunc();
}
baseImage.src = base;
overlayImage.src = overlay;
}
我想将图片保存到一个路径,但我不想显示它,我如何才能做到这一点,或者有任何插件可以做到这一点。我已经自己解决了这个问题,我发现如果我一个接一个地快速绘制画布并保存,您不会注意到画布的更改,因此,图像似乎没有显示就保存了下来,但实际上是在很短的时间内显示出来的