需要结合key来使用。 v-for中的key是什么作用? key属性主要用在Vue的虚拟DOM算法,在新旧nodes对比时辨识VNodes。 如果不使用key,Vue会使用一种最大限度减少动态元素并且尽可能的尝试就地修改/复用相同类型元素的算法。 而使用key时,它会基于key的变化重新排列元素顺序,并且会移除/销毁key不存在的元素。 VNode是什么?
对象v-for = "(item,key,index) in obj " item是obj的属性值 json类型数据 v-for = “(item,index) in json” 嵌套类型数据 <ul> <li v-for = "item in lists"> <p>id: {{item.id}}</p> <ul> <li v-for = "task in item.task"> <p>task : {{ task}}</p> </li> </ul> <...
title: "春天", content: "我把裤衩一脱,春姑娘就来了"}, { id: 2, title: "夏天", content: "我把短裤一穿,夏姑娘就来了" } ]) </script> <template> <HelloWorld v-for="item in fatherItems" :key="item.id" :title="item
@select="select"v-for="item in menu.children":key="item.id":menu="item"/></template><script lang="ts">import{defineComponent}from"vue";exportdefaultdefineComponent({name:"Menu",props:{menu:{type:Object,},},});</script>复制代码 组件的 name 可以在自身中直接使用,而不需要在 component 中...
K(Key):表示对象中的键类型 V(Value):表示对象中的值类型 E(Element):表示元素类型 12.4 泛型工具类型 为了方便开发者 TypeScript 内置了一些常用的工具类型,比如 Partial、Required、Readonly、Record 和 ReturnType 等。出于篇幅考虑,这里我们只简单介绍 Partial 工具类型。不过在具体介绍之前,我们得先介绍一些相关...
...<template><divclass="group-wrapper"><h3>{{groupLabel[props.status]}}</h3><ul><li v-for="todo in todoList":key="todo.id">{{todo.title}}<div><spanclass="todo-description">{{todo.description}}</span></div></li></ul></div></template><style lang="less"scoped>.group-wrappe...
Default url path for the according service. Static _entityName _entityName: string = 'A_ClfnClassKeywordForKeyDate' Overrides EntityV2._entityName Defined in packages/vdm-op/class-data-for-classification-service/ClfnClassKeywordForKeyDate.ts:17 Technical...
Defined in packages/vdm-op/class-data-for-classification-service/ClfnClassKeywordForKeyDate.ts:89 classKeywordPositionNumber classKeywordPositionNumber: string Defined in packages/vdm-op/class-data-for-classification-service/ClfnClassKeywordForKeyDate.ts:91 Opt...
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One such improvement is that TypeScript now can let types flow through return types in some contexts. This means you can decide more freely where to put your types. For example: Copy functionarrayMap<T,U>(f:(x:T)=>U):(a:T[])=>U[] {returna=>a.map(f); ...