求助---变量被重置问题---求助 - 编程论坛

以下这段代码变量 var t=0；老是被重置。请各位老师帮我看看为什么。
==================================================================================
<html>
<head>
    <meta charset="UTF-8">
    <div id="div" style="width:10000px; height:50px">
        <h1> 测试 </h1>
    </div>

   <script>
        <!--var d = document.getElementById("div");
        <!--d.style.backgroundColor = "blue";
    </script>
</head>

<form id="f1">

    匹配字符:
    <input type="text" id="RR1" style="width:500px;height:30px" value="41.22.22.22.13"><hr>
    <!录入数据:<input type="text" id="RR" onchange="myFunction()" onkeypress="myFunction()">

    录入数据:<input type="text" id="RR" style="width:500px;height:30px" onkeypress="myFunction()" > <br>
    <button id="ftt" onclick="myFunction()">保存</button>

</form>

<body>
    <script>
        var oTxt = document.getElementById('RR').focus(); <!--锁定焦点
        var all1 = new Array();
       var t = 0;
        console.log(t)
        function myFunction() {
            var input1=document.getElementById('RR').value;
            var input2=document.getElementById('RR1').value;
            var patt1 = new RegExp(input2);
            var x = "";
            if (event.keyCode == 13) {
                if ((patt1.test(input1) == true) && (undefined != input1) && ("" != input1)) {
                    x = "YES"

                    all1[t] = input1;
                    ++t;
                    document.getElementById('RR').value = ""
                    document.getElementById('DF1').innerHTML = all1;
                    console.log(t)
                    console.log(all1)
                } else {
                    x = "NO"
                }
            }

            document.getElementById("DF").innerHTML = x;
        }


    </script>

    判断:
    <output id="DF"></output>
    <hr>累计:
    <output id="DF1"></output>
    <hr>计数:
    <output id="DF2"></output>
    <hr>

</body>

</html>