Refine “Custom Directive” #589
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Jinjiang
reviewed
Nov 9, 2017
src/v2/guide/custom-directive.md
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| ## 简介 | |||
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| 除了默认设置的核心指令 (`v-model` 和 `v-show`)，Vue 也允许注册自定义指令。注意，在 Vue2.0 里面，代码复用的主要形式和抽象是组件——然而，有的情况下，你仍然需要对纯 DOM 元素进行底层操作，这时候就会用到自定义指令。下面这个例子将聚焦一个 input 元素，像这样： | |||
| 除了核心功能默认内置的指令 (`v-model` 和 `v-show`)，Vue 也允许注册自定义指令。注意，在 Vue2.0 中，代码复用和抽象的主要形式是组件。然而，有的情况下，你仍然需要对普通 DOM 元素进行底层操作，这时候就会用到自定义指令。其中一个例子是对一个输入元素进行聚焦操作，就像这样： | |||
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其中一个例子是对一个输入元素进行聚焦操作，就像这样
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举个聚焦输入框的例子，如下
Jinjiang
reviewed
Nov 9, 2017
| - `arg`：传给指令的参数，可选。例如 `v-my-directive:foo` 中，参数为 `"foo"`。 | ||
| - `modifiers`：一个包含修饰符的对象。例如：`v-my-directive.foo.bar` 中，修饰符对象为 `{ foo: true, bar: true }`。 | ||
| - `vnode`：Vue 编译生成的虚拟节点。移步 [VNode API](../api/#VNode-接口) 来了解更多详情。 | ||
| - `oldVnode`：上一个虚拟节点，仅在 `update` 和 `componentUpdated` 钩子中可用。 |
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一些翻译的修正、用词的调整。