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I have met a problem when I am developing a Metamask installed Dapp.

I am using web3.personal.sign()to get the signature of accounts. However, I could not get the returned signature string from this function. I want to put the signature into another variable, but this variable is always undefined and cannot be printed.

At the meantime, the resultant signature can be printed when I using console.log()as a callback function, but it still cannot return a string.

The sample code is like web3.personal.sign(nonce,web3.eth.coinbase,console.log). In this way, the signature can be printed otherwise the result is always undefined.

I have checked all the web3 API documentations, saing the function will return a tring, but I just cannot get it.

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