-4

これの間違いを理解するのを手伝ってください:

var username = document.getElementById("username_input").value;
var password = document.getElementById("password_input").value;
var password_confirm = document.getElementById("password_confirm").value;
xhr.open('POST', 'header/onsubmit_check.php');
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send("username=" + username + "&password"= + password +"&password_confirm=" + password_confirm);
4

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