Link.js:11UncaughtTypeError:Cannotread property'context'ofnullat handleClick (http://localhost:3000/static/js/bundle.js:33792:12)atObject.ReactErrorUtils.invokeGuardedCallback(http://localhost:3000/static/js/bundle.js:17162:17)at executeDispatch (http://localhost:3000/static/js/bundle.js:16945:22...
1 Can't getContext of canvas 12 canvas.getContext() is not a function 0 Canvas object literal: Uncaught TypeError: Cannot call method 'getContext' of undefined 0 "Uncaught TypeError: Cannot read property 'getContext' of undefined" when drawing on canvas 6 canvas.getContext is not ...
可以先贴个代码，字面意思来讲是canvas画布没找到。
chrome/极速360浏览器报错:Cannot read property 'getContext' of null filefox报错:TypeError: c is null IE Edge:控制台没有报错,但是canvas图像也不显示 IE10/IE9报错:SCRIPT5007: 无法获取未定义或 null 引用的属性“getContext” 解决方法: 将绘制方法,即绘制图片的方法,放在body下面 因为Chrome下需要文档载...
TypeError: Cannot read property 'getContext' of null at vB(webpack://frontend/./node_modules/lightweight-charts/dist/lightweight-charts.esm.production.js:7:85788) at $c(webpack://frontend/./node_modules/lightweight-charts/dist/lightweight-charts.esm.production.js:7:112215) at $c(webpack:...
react cannot read property usecontext of null The error "Cannot read property 'useContext' of null" in React usually occurs when you try to use the useContext hook within a component that is not properly wrapped in a Context Provider. To fix this issue, you need to make sure that the ...
From maintainers: if you have this problem, please see the explanation in #6895 (comment). Test case: jsFiddle The error is in this function, internalInstance is null. /** * Releases any resources allocated by `mountComponent`. * * @fina...
我在Chrome浏览器上出现这个问题的。 解决方法: 将绘制方法,即绘制图片的方法,放在body 因为chrome下需要文档载入完成后才能获得canvas对象 发布于 2018-02-07 16:36 前端入门 赞同1添加评论 分享喜欢收藏申请转载 写下你的评论... 还没有评论,发表第一个评论吧 推荐阅读 从一个...
当在Canvas上调用getContext()方法时,如果出现null错误,通常是由于以下几个原因: 元素未正确定义:确保在HTML中正确定义了Canvas元素,并且具有正确的id或类名。 上下文类型错误:确保传递给getContext()方法的上下文类型参数正确。常用的上下文类型是"2d",用于绘制2D图形。