JS Encoding and Decoding

//charator Str to Hex
function strToHex(str) {
    var rs = "";
    for (var i = 0; i < str.length; i++)
        rs = (rs == "" ?"":rs + ",")+ str.charCodeAt(i).toString(16);
    return rs;
}
//Hex to charator Str
function hexToStr(str) {
    var arr = str.split(","),rs="";   
    for(var i = 0; i < arr.length; i++)
        rs += String.fromCharCode(arr[i]);
    return rs;
}
function asciiHexToStr(str) {
    var symbols = " !\"#$%&'()*+,-./0123456789:;<=>?@" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "[\\]^_`" + "abcdefghijklmnopqrstuvwxyz" + "{|}~";
    str = str.toLowerCase();
    var hex = "0123456789abcdef";
    var text = "";
    var i = 0;

    for (i = 0; i < str.length; i = i + 2) {
        var char1 = str.charAt(i);
        if (char1 == '') {//分隔符char1== ":";
            i++;
            char1 = str.charAt(i);
        }
        var char2 = str.charAt(i + 1);
        var num1 = hex.indexOf(char1);
        var num2 = hex.indexOf(char2);
        var value = num1 << 4;
        value = value | num2;

        var valueInt = parseInt(value);
        var symbolIndex = valueInt - 32;
        var ch = '?';
        if (symbolIndex >= 0 && value <= 126) {
            ch = symbols.charAt(symbolIndex)
        }
        text += ch;
    }
    return text;
}
function strToAsciiHex(str) {
    var symbols = " !\"#$%&'()*+,-./0123456789:;<=>?@" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "[\\]^_`" + "abcdefghijklmnopqrstuvwxyz" + "{|}~";
    var hexChars = "0123456789abcdef";
    var text = "";
    for (i = 0; i < str.length; i++) {
        var oneChar = str.charAt(i);
        var asciiValue = symbols.indexOf(oneChar) + 32;
        var index1 = asciiValue % 16;
        var index2 = (asciiValue - index1) / 16;
        if (text != "") text += "";//分隔符text += ":";
        text += hexChars.charAt(index2);
        text += hexChars.charAt(index1);
    }
    return text;
}