var password = document.getElementById('password').value;
var regPassword = "^(?!^[0-9]+$)(?!^[a-zA-Z]+$)[0-9a-zA-Z_]{6,16}$";
var passwordFalg = password.search(regPassword);
if (passwordFalg == -1) {
    alert("密码格式不正确,不能是纯数字或者纯字母,不能包含特殊字符,密码长度在6~16位之间!");
    return;
}

 

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