js monitors input box changes (input propertychange change)

Today, I need to monitor the changes of the input box to make a web page. I found several different solutions and made a record. The following example can be directly pasted into the html file to perform the preview locally.

method one:

Reference blog: https://blog.csdn.net/otengyue/article/details/50708277

<!DOCTYPE html>
<html>
<head>
<title> js monitor input box changes</title>
<script type="text/javascript">
  var oshow=document.getElementById("show");
  var count=0;
  $("#txt").bind("input propertychange change",function(event){
      count=count+1;
      oshow.innerHTML=count;
  });
</script>
</head>
<body>
<div id="show"></div>
<input type="text" id="txt" value="ssh"/>
</body>
</html>

Method Two:

Reference blog: https://blog.csdn.net/stu_zkl/article/details/53223235

<!DOCTYPE html>
<html>
<head>
<title>js monitor input box changes</title>
<script type="text/javascript">
window.onload=function(){
  var otxt=document.getElementById("txt");
  var oshow=document.getElementById("show");
  var count=0;
  if(document.all){
     otxt.onpropertychange=function(){
       count=count+1;
       oshow.innerHTML=count;
     }
  }
  else{
    otxt.oninput=function(){
      count=count+1;
      oshow.innerHTML=count;
    }
  }
}
</script>
</head>
<body>
<div id="show"></div>
<input type="text" id="txt" value="ssh"/>
</body>
</html>

Method 3:
This method can be used when there is a conflict in method 2.

<!DOCTYPE html>
<html>
<head>
<title> js monitor input box changes</title>
<script type="text/javascript">
window.onload=function(){
  var otxt=document.getElementById("txt");
  var oshow=document.getElementById("show");
  var count=0;
  if(document.all){
     otxt.onpropertychange=function(){
       count=count+1;
       oshow.innerHTML=count;
     }
  }
  else{
    otxt.oninput=function(){
      count=count+1;
      oshow.innerHTML=count;
    }
  }
}


function _addLoadEvent(func)
{
    var oldonload=window.onload;
    if(typeof window.onload != 'function')
    {
        window.onload=func;
    }
    else
    {
       oldonload();
       func();
    }
}
_addLoadEvent(spring_x);


function spring_x(){   
  var otxt=document.getElementById("txt");
  var oshow=document.getElementById("show");
  var count=0;
  if(document.all){
     otxt.onpropertychange=function(){
       count=count+1;
       oshow.innerHTML=count;
     }
  }
  else{
    otxt.oninput=function(){
      count=count+1;
      oshow.innerHTML=count;
    }
  }
}
</script>
</head>
<body>
<div id="show"></div>
<input type="text" id="txt" value="ssh"/>
</body>
</html>

js monitors input box changes (input propertychange change)

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