zip文件解压

// Convert a hex string to a byte array
function hexToBytes(hex) {
    for (var bytes = [], c = 0; c < hex.length; c += 2)
        bytes.push(parseInt(hex.substr(c, 2), 16));
    return bytes;
}

// Convert a byte array to a hex string
function bytesToHex(bytes) {
    for (var hex = [], i = 0; i < bytes.length; i++) {
        var current = bytes[i] < 0 ? bytes[i] + 256 : bytes[i];
        hex.push((current >>> 4).toString(16));
        hex.push((current & 0xF).toString(16));
    }
    return hex.join("");
}

 function stringToByte(str) {
      var bytes = new Array();
      var len, c;
      len = str.length;
      for(var i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if(c >= 0x010000 && c <= 0x10FFFF) {
          bytes.push(((c >> 18) & 0x07) | 0xF0);
          bytes.push(((c >> 12) & 0x3F) | 0x80);
          bytes.push(((c >> 6) & 0x3F) | 0x80);
          bytes.push((c & 0x3F) | 0x80);
        } else if(c >= 0x000800 && c <= 0x00FFFF) {
          bytes.push(((c >> 12) & 0x0F) | 0xE0);
          bytes.push(((c >> 6) & 0x3F) | 0x80);
          bytes.push((c & 0x3F) | 0x80);
        } else if(c >= 0x000080 && c <= 0x0007FF) {
          bytes.push(((c >> 6) & 0x1F) | 0xC0);
          bytes.push((c & 0x3F) | 0x80);
        } else {
          bytes.push(c & 0xFF);
        }
      }
      return bytes;
 
 
    }