function stringToHex(str){
    var val = "";
    for (var i = 0; i < str.length; i++) {
        var v = str.charCodeAt(i).toString(16);
        if ( v.length < 2 ) {
            v = "0" + v;
        }
        val += v;
    }
    return val
}


function hexToStr(hex,encoding) {
    var trimedStr = hex.trim();
    var rawStr = trimedStr.substr(0, 2).toLowerCase() === "0x" ? trimedStr.substr(2) : trimedStr;
    var len = rawStr.length;
    if (len % 2 !== 0) {
        alert("Illegal Format ASCII Code!");
        return "";
    }
    var curCharCode;
    var resultStr = [];
    for (var i = 0; i < len; i = i + 2) {
        curCharCode = parseInt(rawStr.substr(i, 2), 16);
        resultStr.push(curCharCode);
    }
    // encoding为空时默认为utf-8
    var bytesView = new Uint8Array(resultStr);
    var str = new TextDecoder(encoding).decode(bytesView);
    return str;
}


/**
 * 输入 json 格式的授信信息
 * 返回 hex 格式的登录信息
 */
function auth( info ){
    var str = "";
    var manufactor = info.manufactor + "        ";
    manufactor.substr(0, 8);
    var system = info.system + "        ";
    system.substr(0, 8);
    var customer = info.customer;
    str = manufactor + system + customer
    return stringToHex( str )
}



// 测试
var test = {
    "manufactor": "sunyard",
    "system": "hsm",
    "customer": "ICBC"
}

console.log( auth(test) )


console.log("hexToStr=" + hexToStr("73756e796172642068736d202020202049434243", "UTF-8"))

// 73756e79617264202020202020202068736d202020202020202049434243
// 73756e796172642068736d202020202049434243