typescript中if判断非空的变量依然会被报错variable is possibly undefined var item = example.children[i];if (item.children) { console.log(item.children.length)} 这里已经是底线啦~
BugA bug in TypeScript on Dec 28, 2016 @Aides359 From my point of view allowing it is strictly a bad thing. You've declared the type of the variable to benumberand then compare it toundefined. That's dead code by my definition. If it was allowed I'd have been really disappointed....
path=/story/example-button--broken-story You'll see it can't find key or null. I've added a prop to theButton.vueofobjand this is the story: const obj = { key: 'value' }; export const BrokenStory = () => ({ components: { MyButton }, props: { obj: { default: obj }, }...
有的网页为了防止 tampermonkey 这类插件读取页面中的 js 变量,把变量写到了匿名自调用函数 self-invocation中,例如 <script type="text/javascript"> (function() { var a = 1; console.log(a); })(); </script> 而我为了某些不可告人的目的必须读取到变量 a 的值。 一种有效的方式是,使用 ajax 获取...
(typescript rust finance vimscript html sql csv ivy (auto-completion :variables auto-completion-return-key-behavior nil auto-completion-tab-key-behavior 'complete) better-defaults csharp emacs-lisp git markdown (org :variables org-enable-bootstrap-support t) (shell :variables shell-default-term-...