Dynamically add js code examples for events_javascript skills

Copy code The code is as follows:

< ;script language="javascript">
attachEvent("onblur", blur);
function blur()
{
document.all.form.username.attachEvent("onblur", blur );
if(event.srcElement == document.all.form.username){
alert("efewef");
}
}

The execution order is:
execute alert("hello") first;
then execute alert("efewef");