web3.eth.getBlock

Returns the block corresponding to the block number or block hash

transfer:

web3.eth.getBlock(blockHashOrBlockNumber [, returnTransactionObjects] [, callback])

parameter:

blockHashOrBlockNumber: Number|String - (optional) If no parameter is passed, the block defined by web3.eth.defaultBlock is used by default, otherwise the specified block is used.
returnTransactionObjects: Boolean - (optional) Default is false. true will return all transactions contained in the block as objects. Otherwise just return the hash of the transaction.
callback: Function - callback function, used to support asynchronous execution 7.

Return value - block object:

Number - the block number. Returns null when the block is pending.
hash - string, the hash of the block. Returns null when the block is pending.
parentHash - String, 32 bytes hash of parent block.
nonce - String, 8 bytes. POW generated hash. Returns null when the block is pending.
sha3Uncles - String, 32 bytes. The hash of the uncle block.
logsBloom - String, Bloom filter 9 for block logs. Returns null when the block is pending.
transactionsRoot - String, 32 bytes, the root of the block's transaction prefix tree.
stateRoot - String, 32 bytes. The root of the final state prefix tree for the block.
miner - String, 20 bytes. The miner who received the reward for this block.
difficulty - BigNumber type. The difficulty of the current block, an integer.
totalDifficulty - BigNumber type. The total difficulty of the blockchain to the current block, an integer.
extraData - String. The extra data field of the current block.
size - Number. The current size in bytes of this block.
gasLimit - Number, the maximum gas allowed for the current block.
gasUsed - The total gas cumulatively used by the current block.
timestamp - Number. The unix timestamp when the block was packed.
transactions - array. Trading partners. Or a 32-byte transaction hash.
uncles - array. Array of uncle hashes.

Example:

var info = web3.eth.getBlock(3150);
console.log(info);
/*
{
  "number": 3,
  "hash": "0xef95f2f1ed3ca60b048b4bf67cde2195961e0bba6f70bcbea9a2c4e133e34b46",
  "parentHash": "0x2302e1c0b972d00932deb5dab9eb2982f570597d9d42504c05d9c2147eaf9c88",
  "nonce": "0xfb6e1a62d119228b",
  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "transactionsRoot": "0x3a1b03875115b79539e5bd33fb00d8f7b7cd61929d5a3c574f507b8acf415bee",
  "stateRoot": "0xf1133199d44695dfa8fd1bcfe424d82854b5cebef75bddd7e40ea94cda515bcb",
  "miner": "0x8888f1f195afa192cfee860698584c030f4c9db1",
  "difficulty": BigNumber,
  "totalDifficulty": BigNumber,
  "size": 616,
  "extraData": "0x",
  "gasLimit": 3141592,
  "gasUsed": 21662,
  "timestamp": 1429287689,
  "transactions": [
    "0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b"
  ],
  "uncles": []
}
*/

Amway two tutorials:

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