如图,编译时报了bject is possibly 'undefined的错。确实我的obj打印出来是undefined,但是这个方法其实是有的,if下面是走得通的。但是因为构建用了fix规范,以至于会一直报错。百度搜了是ts的问题,然后在ts的compilerOptions里面把 "strict": false,确实不报错了,但是担心统一改成 false会影响项目,因此求问大佬有没有...
I try to use Vite + Vue + Typescript with Volar plugin. Vue version: 3.2.25 Typescript version: 4.5.5 Vite version: 2.8.0 Vue-tsc: 0.33.9 Example link I generate: const testing: Ref<string | undefined> = ref();. At beginning this value i...
鼠标移上去 Object is possibly 'undefined',意思是treeRef.value可能是一个undefined,undefined.function() 浏览器肯定会报错对不对,typescript的好处就是让我们在编译阶段就给我们抛出错误越早发现问题,后期修复工作量就越少,其实这个问题好解决,因为我们知道组件内部是有这个方法,那么我们就给treeRef.value后面强制跟...
If you had required: true, then you state it cannot not be undefined, else it may. The accepted answer is conceptually wrong, but it works because the you check for undefined before accessing the value if (!props.list) ... and the compiler is smart enough to know that. If you know ...
I have a SFC component and everything works great, but vue-tsc keeps throwing an error about a v-if expression saying that the object is possibly undefined, but it says that regardless of things I'm trying to do to handle it. I'll post the full SFC below but here's the variations ...
通常，当我们需要将数据从父组件传递到子组件时，我们使用 props。想象一下这样的结构：你有一些深嵌套...
12、安装libpng-devel(针对报错:Error: pngquant failed to build, make sure that libpng-dev is installed...?) yum install libpng-devel 1. 13、安装automake.noarch sudo yum install automake 1. 14、安装libtool(针对error: possibly undefined macro: AC_PROG_LIBTOOL) sudo ...
Object is possibly null: 对象可能是null 分析:localStorage.getItem(“SET_HISTORY_KEY”) 这个值有可能为空,所以再执行getItem就会报错此刻对象可能为空。 解决: 联合类型 把null的情况写入 在这里插入图片描述 类型断言成any类型,any类型上访问任何属性和方法都是被允许的。
❯ npm run build > hello-vue3@0.0.0 build > vue-tsc --noEmit && vite build src/views/home.vue:27:7 - error TS2532: Object is possibly 'undefined'. 27 child.value.isShowDialog = true ~~~ Found 1 error in src/views/home.vue:27 这是因为在默认情况下 null 和undefined 是所有...