bind the enter event in the input box of the username and password when logging in
when the login user clicks the enter error pop-up window prompt, and when you click enter again, the enter event is called again. How to enter only close the pop-up window when there is a pop-up window, and call the enter event normally when there is no pop-up window
generally choose the scarlet letter prompt directly below the input error instead of the pop-up window
add a judgment to your carriage return event
if(show){
//close window..
}else{
} sets a variable. When an error is reported, the pop-up window is set to 1, and if the pop-up window clicks OK, it is reset to 0. Then enter event determines that this value is not 1 before submitting
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