input输入密码变黑点密文的实现方法

<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>

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;}