<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<input type="number" id="money">
</body>
</html>
<script src="jquery.js" style="color:green;"></script>
<script>
    var moneyNode = $('#money');
    moneyNode.focus()
    moneyNode.on('keyup',function () {
        if($('#money').val() ==''){
            $('#money').val('')
        }
        valKey();
        var moneyNum = moneyNode.val();
        if ( moneyNum.indexOf('.') > -1 && moneyNum.substring(moneyNum.indexOf('.') + 1).length <2 ){

        }else if ( moneyNum.indexOf('.') > -1 && moneyNum.substring(moneyNum.indexOf('.') + 1).length == 2 ){
            if(Number(moneyNum) > 0){
            }else{
                moneyNode.val(0.0);
            }
        }else if(moneyNum.indexOf('.') > -1 && moneyNum.substring(moneyNum.indexOf('.') + 1).length > 2 ){
           var moneyNum = moneyNum.substring(0,moneyNum.indexOf('.') + 3)
            var moneyNum = Number(moneyNum);
            moneyNode.val(moneyNum);
        }
        var moneyNum = moneyNum.toString();
        if(!(moneyNum.indexOf('.') > -1) && moneyNum.substring(0,1) == '0'){
            moneyNode.val(0)

        }
        var moneyNum  = moneyNum.toString();
        if (moneyNum.indexOf('.') > -1){
            document.getElementById("money").onkeypress=function(e){
                var keynum=window.event ? e.keyCode : e.which;
                var keychar = String.fromCharCode(keynum);
                if(keychar=='.')
                    return false;
                else
                    return true;
            };
        }
        function valKey() {
            document.getElementById("money").onkeypress=function(e){
                var keynum=window.event ? e.keyCode : e.which;
                var keychar = String.fromCharCode(keynum);
                if(keychar=='.')
                    return true;
            };
        }
    })
</script>