JS里获取汉字简拼

function getsimplepy() {
      var text = document.getElementById("txt_py").value;
      var returnStr = "";
       for (var i = 0; i < text.length; i++) {
             returnStr = returnStr + getsimplepychar(text.substring(i, i + 1))
       }
        //return returnStr;
        alert(returnStr);
}

        //获取简拼方法
        function getsimplepychar(text) {
            var returnChar = "";
            execScript("ascCode=Asc(\"" + text + "\")", "vbscript");
            var tmp = 65536 + ascCode;
            if (tmp >= 45217 && tmp <= 45252)
                returnChar = "A";
            else if (tmp >= 45253 && tmp <= 45760)
                returnChar = "B";
            else if (tmp >= 45761 && tmp <= 46317)
                returnChar = "C";
            else if (tmp >= 46318 && tmp <= 46825)
                returnChar = "D";
            else if (tmp >= 46826 && tmp <= 47009)
                returnChar = "E";
            else if (tmp >= 47010 && tmp <= 47296)
                returnChar = "F";
            else if (tmp >= 47297 && tmp <= 47613)
                returnChar = "G";
            else if (tmp >= 47614 && tmp <= 48118)
                returnChar = "H";
            else if (tmp >= 48119 && tmp <= 49061)
                returnChar = "J";
            else if (tmp >= 49062 && tmp <= 49323)
                returnChar = "K";
            else if (tmp >= 49324 && tmp <= 49895)
                returnChar = "L";
            else if (tmp >= 49896 && tmp <= 50370)
                returnChar = "M";
            else if (tmp >= 50371 && tmp <= 50613)
                returnChar = "N";
            else if (tmp >= 50614 && tmp <= 50621)
                returnChar = "O"
            else if (tmp >= 50622 && tmp <= 50905)
                returnChar = "P";
            else if (tmp >= 50906 && tmp <= 51386)
                returnChar = "Q";
            else if (tmp >= 51387 && tmp <= 51445)
                returnChar = "R";
            else if (tmp >= 51446 && tmp <= 52217)
                returnChar = "S";
            else if (tmp >= 52218 && tmp <= 52697)
                returnChar = "T";
            else if (tmp >= 52698 && tmp <= 52979)
                returnChar = "W";
            else if (tmp >= 52980 && tmp <= 53640)
                returnChar = "X";
            else if (tmp >= 53689 && tmp <= 54480)
                returnChar = "Y";
            else if (tmp >= 54481 && tmp <= 62289)
                returnChar = "Z";
            else //如果不是中文，则不处理
                returnChar = text;
            return returnChar;
        }

<body>
    <form id="form1" runat="server">
    <input type="text" id="txt_py" />
    <input type="button" id="btn_py" value="获取简拼" onclick="getsimplepy()" />
    </form>
</body>

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JS里获取汉字简拼