ERC20代币空投
airdrop Contract:0x57fe15669781fe7df7efea813917c54534728e14
tokenAddr 空投ERC20合约地址
toAddr: 空投的地址,array ,例如:["0x0012b78e6f942b173cf9d90ff197e29b604a290e","0x00c4803aa7cdfe5ae5d325b79d5c3c384e4a8ae9"]
value: value*10**18, 例如:空投500,传"1000000000000000000"