loadstart

当程序开始加载时,loadstart 事件将被触发。这个事件可以被 XMLHttpRequest 调用, 也适用于 <img> 和 <video> 元素.

基本信息

规范文档
Progress
接口
ProgressEvent
冒泡
No
可取消
No
目标
Element
默认动作
None

属性

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.

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