It is recommended to add a line of code.

[mahuaibo]

constructor：function EIP20

add code: emit Transfer(address(0), msg.sender, totalSupply);

[mahuaibo]

function EIP20(uint256 _initialAmount, string _tokenName, uint8 _decimalUnits, string _tokenSymbol ) public {
balances[msg.sender] = _initialAmount; // Give the creator all initial tokens
emit Transfer(address(0), msg.sender, totalSupply); // ** add code **
totalSupply = _initialAmount; // Update total supply
name = _tokenName; // Set the name for display purposes
decimals = _decimalUnits; // Amount of decimals for display purposes
symbol = _tokenSymbol; // Set the symbol for display purposes
}