emoji2Str.html

<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
    <title>emoji2Str</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />
</head>

<body>

   <input id="a" type="text" maxlength="" />

   <button onclick="f()">click</button>
   <p id="b"></p>
    <script>


       function f(){
        var a=document.getElementById("a");
        var b=document.getElementById("b");
        b.innerText=emoji2Str(a.value);
       }


        function emoji2Str (str) {

return unescape(escape(str).replace(/\%uD.{3}/g, '口'));

}
    </script>
</body>

</html>