Clarified v-model props/events for native elements (#1974)

NataliaTepluhina · Justineo · commit 2b4c1957474e · 2019-02-19T00:28:42.000+08:00
* Added details for v-model

Explained what events and properties v-model  for different input elements

* fix: refactored tip to bullet points
diff --git a/src/v2/guide/forms.md b/src/v2/guide/forms.md
@@ -10,6 +10,12 @@ order: 10
 
 <p class="tip">`v-model` 会忽略所有表单元素的 `value`、`checked`、`selected` 特性的初始值而总是将 Vue 实例的数据作为数据来源。你应该通过 JavaScript 在组件的 `data` 选项中声明初始值。</p>
 
+<!-- todo: translation -->
+`v-model` internally uses different properties and emits different events for different input elements:
+- text and textarea elements use `value` property and `input` event;
+- checkboxes and radiobuttons use `checked` property and `change` event;
+- select fields use `value` as a prop and `change` as an event.
+
 <p class="tip" id="vmodel-ime-tip">对于需要使用[输入法](https://zh.wikipedia.org/wiki/%E8%BE%93%E5%85%A5%E6%B3%95) (如中文、日文、韩文等) 的语言，你会发现 `v-model` 不会在输入法组合文字过程中得到更新。如果你也想处理这个过程，请使用 `input` 事件。</p>
 
 ### 文本
