如何将画布保存为 png 图像? [英] how to save canvas as png image?

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本文介绍了如何将画布保存为 png 图像?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个带有绘图的画布元素,我想创建一个按钮,单击该按钮后,它会将图像另存为 png 文件.所以它应该打开保存,打开,关闭对话框......

I have a canvas element with a drawing in it, and I want to create a button that when clicked on, it will save the image as a png file. So it should open up the save, open, close dialog box...

我使用这个代码

var canvas = document.getElementById("myCanvas");
window.open(canvas.toDataURL("image/png"));

但是当我在 IE9 中进行测试时,会打开一个新窗口,提示无法显示网页";它的网址是:

But when I test it out in IE9, a new window opens up saying "the web page cannot be displayed" and the url of it is:

<代码>数据:图像/PNG; BASE64,iVBORw0KGgoAAAANSUhEUgAAAmAAAABpCAYAAACd + 58xAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAADRwSURBVHhe7V0HgBVF0q7ZJSlJwRxAPUFRD39RFLN34qGnnomoqIjhzBlFPROIgsoZzogR5AQEzJ4BPFAUEUwgJjgQkCQKooggaf/6el6/6ZnpSW/zUn237u5MdXX1172 + z6rqaqeEG6VsJet + PDW/vkdrfx3H3yfT2tVzaP26X6hkw1q/BoeI/280/29JwznZxJPUyXtBQBAQBAQBQaBcECjefmi56BWlZYtAeqajx/WokfrJYEqOIikOFRfXoVq161PtOk2odu0t + ectqKiojnrntWhC46QhYOtXfUarl79Ivy9/ldau + H + TX/8b2SbjJ07pWFQy2Uqnp2yXSrQJAoKAICAICALJCAgBS8ao8iTi/UvpSZlBxiwqwWOKimsxCWtEdettR3XqbEfFtRonkrBYArZh3fe0 +senadWyEbRm1UzasP53K45ZiFc84RKyVXkbVUYWBAQBQUAQyIqAELCsiFW2fDQpSyZk8UQMMysqKmaPWCOqt8mOVK/eTuQU1YuccCQBW7dyIq38/J5A/fN的/ad3a5QGXmqsvLfGKJl0ZCFdONEOPyl5lGV8QEAQEAUGghiMgBKzqLHCeHqVOrILtduF4MpZExEqoVq167A3bmjap34J/bmoFqcj2dM3Pr9GK + b1p5bJXmXz9nEC + 3FiorYF4hcmXlo + gUrk +微米/+ E + QoVWfxxRJBQBAQBAQBQUAQqBwE8uzCwiMiaEqOWYR5jJ2/6Hl58nYHk0Pr1v1Ov62cTytXfE5r1yyyc6RgDhjI16 + L + tLqFZ9xnteGUKc0Xi876YpYkFDCfpqFEz9YGpRERhAQBAQBQaB8ERAPWPnim157JreX6/eK7eJ/Ge0RS8oPc9gT1pTqN2jFocltfdPxecBU2HHxgBTky + 71CjPGCO + YyU4j0TU9ZcGf0y + JSAoCgoAgIAgIAoJATUcgG2dQ0jpKZ/XP + PlLtEcs3huGQhO/r17K3rBvuGrEUt8i5HPAkHC/Yt6lKuwYKiuRM9TtGbY0rcerTBLwC/KY1fSNJ/MTBAQBQUAQqAwExANWGaiHx0z2aJl9CknET + MRc2XsVSKKaNP6O1CDhvtwYn5dJZf3gOG0IxLuS0e + LB4vw9sVhiwmHywmF6xqLLdYIQgIAoKAICAICAJVAQHTo2XmkNtzv6K5R7RXLOwRs3MaW + 47SNkG9oRxZQmun6qbImCo84VSE + 5pR3/zvFZJni/7e8tTHiCeqCkAqsKKig2CgCAgCAgCgoAgUG0RCBKzMLmwkzHdL4pk4XlUAn7Uu3XrVtPqVfO4lurPSq0KQa5cdAv9snBgqM5XFPlKSsSPM8o3mcxES2hZtf0rEMMFAUFAEKiBCEgIsqotavpk/OiwZViHPQk/LgHfHo5EnbCGjVpxeYo9yNmw9oeSn2YeTatWTPNzozzX8ZOeWPJlJVRJnrOoxUtJtmLEUmqoartH7BEEBAFBQBCoJggIASu/hUqkUokC2rZkwSSCBU12wpadhNXbpAk13vwwKlJ3O/L1QmYrxPNlDxuGyVtyIn6K8KSZHwY3XsRX + W0L0VyTEPjwM6KuFxN1uiB6Vkv48MpdjxLt9ieieQvscuvWE13eh2jnQ9zv + F2aICAICAKCQGEIRH22559H5IqnDTMGeU/SgUJ7WNLjOVH9g8/Xrv2Fa4P9SM6K7y4t + WXRw76sfVc42fPV936iJ5 +LKrbqTU0P3rA + 0dZbEh20L9HJHYj23I2oVrHFT5U5NFnY4m6svUA0Pvo8efbvjCBqtr0nN + IVot4Dkvv1v5aoy/HJcpUpsfI3olffdknV0uWuJfv9kWjkw55VIFAfM073PE4EkqZbEBf9HMTs8C6e3KhHiPbdqzJnKWMLAoJAeSMgHrDyRrj0+rOEGvVoYY9Y0inIeE+YqQ+cqGGj3dgDtvJjC/mKm7BHmG68lGjO+0T

有人知道如何解决这个问题吗?

Anyone know how to fix this?

推荐答案

试试这个:

var canvas = document.getElementById("alpha");
var dataURL = canvas.toDataURL("image/png");
var newTab = window.open('about:blank','image from canvas');
newTab.document.write("<img src='" + dataURL + "' alt='from canvas'/>");

这会在新页面上显示画布中的图像,但是如果您有 open popup in new tab 设置,它会在地址栏中显示 about:blank.

This shows image from canvas on new page, but if you have open popup in new tab setting it shows about:blank in address bar.

- 尽管 window.open("<img src='"+ canvas.toDataURL('image/png') +"'/>") 确实在 FF 或 Chrome 中不起作用,尽管渲染与画布上显示的有些不同,但后续工作,我认为透明度是问题:

- though window.open("<img src='"+ canvas.toDataURL('image/png') +"'/>") does not work in FF or Chrome, following works though rendering is somewhat different from what is shown on canvas, I think transparency is the issue:

window.open(canvas.toDataURL('image/png'));

这篇关于如何将画布保存为 png 图像?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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