Comparison between the onchange event in javascript and the change () method in jQuery _ javascript skills

Originally, I wanted to add text content in the text box to change the event action. As a result, I found many javascript code in this area, which was unsatisfactory. Change the mindset to a keyboard button event as follows:

One problem here is that you cannot trigger this event by copying and pasting the content. The following are some related code:

The Code is as follows:

Function fNameChange (){
If ($ ('# txtName'). val (). length <6 ){
JQuery ("# checkSta" ).html ("the name is too short! ").Css (" color "," red ");
} Else {
Myajax ();
}
}

The following are some content for online search:

The Code is as follows:

// Onload () event
$ (Function () {// The event is indeed appended, but the execution time is incorrect.
$ ('# TxtName'). change (function () {fNameChange ();});
})
/* This is something someone said was implemented using js, and I found that it cannot be used.