How to implement the input password into black dot cipher text

Input password encryption

html code

<form id="login-form" method="post" onsubmit="return checkForm()">
 输入密码<input type="password" id="input-password">
 <input type="hidden" id="md5-password" name="password">
 <button type="submit">Submit</button>
</form>

js code

function checkForm() {
 var input_pwd = document.getElementById('input-password');
 var md5_pwd = document.getElementById('md5-password');
 // 把用户输入的明文变为MD5:
 md5_pwd.value = toMD5(input_pwd.value);
 // 继续下一步:
 return true;
}

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