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当开始加载时，loadstart 事件将被触发。
General info
- Specification
- Progress
- Interface
- ProgressEvent
- 冒泡
- No
- 可取消
- No
- 目标
- Element
- Default Action
- None
Properties
| Property | Type | Description |
|---|---|---|
target 只读 |
EventTarget |
The event target (the topmost target in the DOM tree). |
type 只读 |
DOMString |
The type of event. |
bubbles 只读 |
Boolean |
Whether the event normally bubbles or not |
cancelable 只读 |
Boolean |
Whether the event is cancellable or not? |
lengthComputable |
boolean | Specifies whether or not the total size of the transfer is known. Read only. |
loaded |
unsigned long (long) | The number of bytes transferred since the beginning of the operation. This doesn't include headers and other overhead, but only the content itself. Read only. |
total |
unsigned long (long) | The total number of bytes of content that will be transferred during the operation. If the total size is unknown, this value is zero. Read only. |