-
琉璃〆玥傾城╮2021-12-02 09:29
- 69
- 0
- 共 0 条
- 全部回答
-
久而旧之╮ 普通会员 1楼
Tainted canvases refers to a canvas object that has been used before, potentially contaminated by user actions or JavaScript code. This can lead to unexpected behavior in HTML2Canvas and other tools that work with canvas. To avoid this error, you can check the canvas object's context before using it to generate an image. Here's an example: ```javascript const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d');
// Draw some content to the canvas ctx.fillStyle = 'red'; ctx.fillRect(10, 10, 20, 20);
// Export the canvas as an image const img = canvas.toDataURL('image/png');
// Check if the canvas is Tainted if (ctx !== null) { // Generate an image using the canvas const img2 = html2canvas(canvas, { onrendered: function(canvas) { // Do something with the image } }).then((imgData) => { // Export the image as a file const blob = new Blob([imgData], { type: 'image/png' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'image.png'; document.body.appendChild(a); a.click(); document.body.removeChild(a); }); } else { console.log('The canvas is Tainted'); } ```
This example creates a new canvas and checks if its context is not null before using it to generate an image. If the canvas is Tainted, it generates an image using the canvas, which is then exported as a file. If the canvas is not Tainted, the code simply logs an error message. Note that this example only works if the canvas is in a safe context, such as the context of a trusted HTML element or a secure JavaScript environment. If the canvas is in an unsafe context, you may need to add additional checks and sanitization to the code to avoid Tainted canvases.
-
烟敛寒林 普通会员 2楼
Tainted canvases refers to a canvas object that has been used before, potentially contaminated by user actions or JavaScript code. This can lead to unexpected behavior in HTML2Canvas and other tools that work with canvas. To avoid this error, you can check the canvas object's context before using it to generate an image. Here's an example: ```javascript const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d');
// Draw some content to the canvas ctx.fillStyle = 'red'; ctx.fillRect(10, 10, 20, 20);
// Export the canvas as an image const img = canvas.toDataURL('image/png');
// Check if the canvas is Tainted if (ctx !== null) { // Generate an image using the canvas const img2 = html2canvas(canvas, { onrendered: function(canvas) { // Do something with the image } }).then((imgData) => { // Export the image as a file const blob = new Blob([imgData], { type: 'image/png' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'image.png'; document.body.appendChild(a); a.click(); document.body.removeChild(a); }); } else { console.log('The canvas is Tainted'); } ```
This example creates a new canvas and checks if its context is not null before using it to generate an image. If the canvas is Tainted, it generates an image using the canvas, which is then exported as a file. If the canvas is not Tainted, the code simply logs an error message. Note that this example only works if the canvas is in a safe context, such as the context of a trusted HTML element or a secure JavaScript environment. If the canvas is in an unsafe context, you may need to add additional checks and sanitization to the code to avoid Tainted canvases.
- 扫一扫访问手机版
回答动态
- 神奇的四哥：发布了悬赏问题阿里云幻兽帕鲁服务器更新之后。服务器里面有部分玩家要重新创建角色是怎么回事啊？预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题函数计算不同地域的是不能用内网吧？预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题ARMS可以创建多个应用嘛?预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题在ARMS如何申请加入公测呀？预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题前端小程序接入这个arms具体是如何接入监控的，这个init方法在哪里进行添加？预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题阿里云幻兽帕鲁服务器刚到期，是不是就不能再导出存档了呢？预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题阿里云幻兽帕鲁服务器的游戏版本不兼容 尝试更新怎么解决？预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题阿里云幻兽帕鲁服务器服务器升级以后 就链接不上了，怎么办？预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题阿里云幻兽帕鲁服务器转移以后服务器进不去了，怎么解决？预计能赚取 0积分收益
- 神奇的四哥：发布了悬赏问题阿里云幻兽帕鲁服务器修改参数后游戏进入不了，是什么情况？预计能赚取 0积分收益
- 回到顶部
- 回到顶部