[JavaScript知识库]javascript json字符串转hex base64toHEX hexToBase64 arrayBufferToBase64 hextoString

javascript ， json字符串转hex ， base64toHEX ， hexToBase64 ，arrayBufferToBase64， hextoString

// hex转json字符串,16进制ASCII
var hextoString = function (hex) {
    var arr = hex.split("")
    var out = ""
    for (var i = 0; i < arr.length / 2; i++) {
        var tmp = "0x" + arr[i * 2] + arr[i * 2 + 1]
        var charValue = String.fromCharCode(tmp);
        out += charValue
    }
    return out
};

// json字符串转hex
var stringtoHex = function (str) {
    var val = "";
    for (var i = 0; i < str.length; i++) {
        if (val == "")
            val = str.charCodeAt(i).toString(16);
        else
            val += str.charCodeAt(i).toString(16);
    }
    val += "0a"
    return val


//64 转hex
function base64toHEX(base64) {

  var raw = atob(base64);

  var HEX = '';

  for ( i = 0; i < raw.length; i++ ) {

    var _hex = raw.charCodeAt(i).toString(16)

    HEX += (_hex.length==2?_hex:'0'+_hex);
  }
  return HEX.toUpperCase();
}
  console.log(base64toHEX("oAAABTUAAg=="));
}


  function hexToBase64(str) {
            return btoa(String.fromCharCode.apply(null,
                str.replace(/\r|\n/g, "").replace(/([\da-fA-F]{2}) ?/g, "0x$1 ").replace(/ +$/, "").split(" "))
            );
        }

        function base64ToHex(str) {
            for (var i = 0, bin = atob(str.replace(/[ \r\n]+$/, "")), hex = []; i < bin.length; ++i) {
                var tmp = bin.charCodeAt(i).toString(16);
                if (tmp.length === 1) tmp = "0" + tmp;
                hex[hex.length] = tmp;
            }
            return hex.join(" ");
   }

arrayBufferToBase64( buffer ) {
        var binary = '';
        var bytes = new Uint8Array( buffer );
        var len = bytes.byteLength;
        for (var i = 0; i < len; i++) {
            binary += String.fromCharCode( bytes[ i ] );
        }
        return window.btoa( binary );
  }

...常用后续补充