当拖动的元素或被选择的文本进入有效的放置目标时，
dragenter 事件被触发。基本信息
| 是否冒泡 | 是 |
| 是否可取消 | 是 |
| 目标对象 | 用户指定的元素或者body元素 |
| 接口 | DragEvent |
| 默认动作 | 取消拖动 |
属性
| 属性 | 类型 | 描述 |
|---|---|---|
target 只读 |
EventTarget |
被拖动的元素下面的元素。 |
type 只读 |
DOMString |
事件类型 |
bubbles 只读 |
Boolean |
事件是否正常冒泡 |
cancelable 只读 |
Boolean |
事件是否已被取消? |
view 只读 |
WindowProxy |
document.defaultView (window of the document) |
detail 只读 |
long (float) |
0. |
dataTransfer |
DataTransfer | The data that underlies a drag-and-drop operation, known as the drag data store. Protected mode. |
currentTarget 只读 |
EventTarget | 触发事件的元素 |
relatedTarget 只读 |
EventTarget | For mouseover, mouseout, mouseenter and mouseleave events: the target of the complementary event (the mouseleave target in the case of a mouseenter event). null otherwise. |
screenX 只读 |
long | 全局（屏幕）坐标中鼠标指针的X坐标。 |
screenY 只读 |
long | 全局（屏幕）坐标中鼠标指针的Y坐标。 |
clientX 只读 |
long | 本地（DOM内容）坐标中鼠标指针的X坐标。 |
clientY 只读 |
long | 本地（DOM内容）坐标中鼠标指针的Y坐标。 |
button 只读 |
unsigned short | 鼠标事件触发时按下的按钮号：左键= 0，中键= 1（如果存在），右键= 2。 对于配置为左手使用的鼠标，其中按钮操作反转，则值从右向左读取。 |
buttons 只读 |
unsigned short | The buttons being pressed when the mouse event was fired: Left button=1, Right button=2, Middle (wheel) button=4, 4th button (typically, "Browser Back" button)=8, 5th button (typically, "Browser Forward" button)=16. If two or more buttons are pressed, returns the logical sum of the values. E.g., if Left button and Right button are pressed, returns 3 (=1 | 2). More info. |
mozPressure 只读 |
float | 触发事件时屏幕的压力值, 介于0.0到1.0之间 |
ctrlKey 只读 |
boolean | 事件触发时ctrl键是否被按下 |
shiftKey 只读 |
boolean | 事件触发时shift键是否被按下 |
altKey 只读 |
boolean | 事件触发时alt键是否被按下 |
metaKey 只读 |
boolean | 事件触发时meta键是否被按下 |
示例：dropzone
{{page('/zh-CN/docs/Web/Events/dragstart', '示例：dropzone')}}
规范
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard dragenter |
Living Standard | |
| HTML 5.1 dragenter |
Recommendation | Initial definition |
浏览器支持
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
Find out how you can help!
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 4 | 3.5 (1.9.1) | 10 | 12 | 3.1 |
| Feature | Android | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|---|
| Basic support | 未实现 | 未实现 | 未实现 | 未实现 | 未实现 | 10 | 未实现 | 未实现 |