Etherscanio

1. It's really not easy.

2.

If you want to query the transaction records on the main network, you can use Etherscan. However, if you build your own private chain, how should you query the transaction records

the answer is that you need to listen to the logs on the chain, save them in the database, and then query them in the database. For example:

< pre t = "code" L = "Java" > varaddr = & quot& quot;< br />varfilter=web3.eth.filter({fromB lock:0 ,toBlock:' latest', address:addr });< br />filter.get(function(err,transactions){
transactions.forEach(function(tx){
vartxInfo=web3.eth.getTransaction(tx.transactionHash);
/ / at this time, the transaction information txinfo can be stored in the database
})< br />});

Web3. Eth. Filter() is used to monitor the log on the chain, and Web3. Eth. Gettransaction() is used to extract the information of the specified transaction. Once the transaction information is obtained, it can be stored in the database for query

recommend a practical introction, you can see: Ethereum tutorial

3. Ethereum browser's website is etherscan.io, you can query Ethereum related details. At present, the exchanges that can trade Ethereum mainly include: coin an, fire coin, bitnet, etc.

4. Ethernet browser is used to browse the web! By the way, the network knows that the system raises higher requirements for high-quality answers. Only when the answers are accurate and correct, can we get high-quality answers and rewards.

5. If you have completed a transaction and the transaction record shows that the package failed, please click Etherscan https://etherscan.io Check the specific status of the transfer on the
the transaction record shows "success", which indicates that your transfer has been successful. Maybe because of the poor network environment of your mobile phone at that time, it will prompt you that the transfer has failed. If "fail" is displayed in the transaction record, it indicates that the transfer has failed. If "out of gas" is prompted in the details interface,
it indicates that the gas value set ring the transfer is lower than the required standard, it is necessary to increase the gas value ring the next transfer. If you prompt "reversed", it means that there is something wrong with the token contract. In this case, you need to contact the token issuer to ask for the specific reason.

6. 1: Curl grabs HTML
2: use regular to intercept the content you need, or use expand to split to get the content, and phpquer can use selector to get the content you need just like jQuery

7. In 2017, the new Cinema4D skill was unlocked. What is C4d? In short, it's a 3D design software. But it seems too simple to say that... In short, C4d can be used to complete some 3D draft creative design, can also be used for advertising design, animation, games, architecture, interior decoration and other 3D related things. As for the difference with 3DMAX, you can search by yourself. Probably in the summer, I watched my girlfriend's C4d course, and then I fell in love with C4d. Always fascinated by all kinds of cool things. And creating and rendering a complex model is very successful. The whole learning process makes the hot summer seem to pass quickly, and soon everyone has to hand in their graation homework.

8.

The specific operation has the following steps:

1. Open the "Taobao" app on the mobile desktop