document.addEventListener("Event name", function, false);
function a function (event){
// method execution
}
The last parameter in addEventListener determines the response order of the event;
if true The order of event execution is addEventListener ---- the onclick event of the label ---- document.onclick
If it is false, the order of events is the onclick event of the label ---- document.onclick ---- addEventListener
is understood as the call entry point for other codes
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