1、项目报错 今天运行一个项目,报了一个错误。 ERROR Cannot read properties of null (reading 'map') TypeError: Cannot read properties of null (reading 'map') at eval (webpack-internal:///./node_modules/babel-loader/lib/index.js??clonedRuleSet-40.use[0]!./node_modules/@vue/vue-loader-v...
8 TypeError: Cannot read property 'map' of null 0 cannot read property of map undefined react 0 Cannot read property map of null 0 Cannot read property of undefied map 1 × TypeError: Cannot read property 'map' of null 0 Cannot read properties of undefined (reading 'map') in Re...
Uncaught (in promise) TypeError: Cannot read properties of null (reading 'map')报错 今天工作时碰到这个报错,排查了一下,发现是.map不能映射null, 表格数据在刚进入页面没有选择参数时接口传过来的空值 兼容一下即可 //数组可能为空,无法map,加上 || [] 兼容即可this.tableData = (res.data.data || ...
TypeError: Cannot read properties of null (reading 'map') Here is my corresponding js file which has error. This error doesn't happen in the localhost, after deploying heroku I have. this is my context.js const cartFromLocal = JSON.parse(localStorage.getItem("cartItems" || "...
Description Logging in with the graph view opened shows the message "Cannot read properties of null (reading 'map')." I was not logged in, and my 3-day trial expired. When I logged in to my account, everything seemed to work fine, but th...
[2022-06-21 10:42:13.425] [renderer1] [error] Cannot read properties of null (reading 'map'): TypeError: Cannot read properties of null (reading 'map') at g (/home/buda/.vscode/extensions/ms-python.isort-2022.3.11671003/dist/extension.js...
如果你尝试在一个null或undefined上调用数组方法,也会出现"Cannot read properties of undefined (reading 'map')"的错误消息。 例如,在下面的代码中: ``` const notExistArray = undefined; const result = notExistArray.map(x => x * 2); console.log(result); ...
React:TypeError: Cannot read properties of undefined (reading 'map') 解决方案 js中?问号代表可选项 可选链式操作符 参考链接 https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_operator
[stack]: [36m[Getter/Setter:[39m [32m"TypeError: Cannot read properties of null (reading 'map')\n"[39m + [32m' at file:///home/Applications/QQBOT/Yunzai/plugins/rconsole-plugin/apps/query.js:211:51\n'[39m + [32m' at process.processTicksAndRejections (node:internal/process/task_...