事件
click
dblclick
dragdrop
dragover
error
errormessage
init
interactivechange
message
middleclick 事件
mousedown
mousemove
mouseup
mousewheel
olecompletedrag
oledragdrop
oledragover
olegivefeedback
olesetdata
olestartdrag
programmaticchange
rightclick
uienable
valid
when