例如: window.onmousedown=function(mouseEvent){console.log(mouseEvent.button);//<-Error}; 对于上面给出类型错误的代码,
name numOctaves O offset onabort onactivate onbegin onclick onend onerror onfocusin onfocusout onload onmousedown
document.documentElement.scrollTop:document.body.scrollTop);}canvas.onmousedown=function(){pressed=true
onfocus,oninput,oninvalid,onkeydown,onkeypress,onkeyup,onload,onloadeddata,onloadedmetadata,onloadstart,onmousedown
//www.w3.org/TR/SVG11/feature#GraphicalEventsAttribute 浏览器支持onfocusin,onfocusout,onactivate,onclick,onmousedown