How to change password in javascript

With the popularity of the Internet, we increasingly need to use various websites and application software. In order to ensure the security of our accounts, we also need to constantly change our passwords. Recently, when I was learning JavaScript, I happened to encounter an exercise question about changing passwords. Today I will share my ideas and code implementation.

First of all, we need to understand the basic process of changing the password. After the user enters the original password and the new password, we need to verify whether the original password is correct before saving the new password to the database. So how to implement this process in javascript?

We can use ajax technology to achieve the effect of submitting data without refreshing the page. Next to the original password and new password input boxes, we add a button to confirm the change. When the user clicks the button, a request will be sent to the server and the original password and new password will be passed in json format.

The next step is to verify whether the original password is correct. The server needs to read the user's original password in the database and compare it with the original password entered by the user. If they are equal, it means the original password is correct; otherwise, it means the original password is wrong. If the original password is wrong, we can output an error message on the page to ask the user to re-enter the original password.

After the original password is verified, we need to save the new password to the database. This process can be performed on the server side, or the effect of submitting data without refreshing the page can be achieved through ajax. We only need to pass the new password entered by the user to the server, and the server will save it to the corresponding user data.

Next, let’s take a look at the specific code implementation. The first is the html code of the front-end page:

<div>
  <label for="oldPw">原密码</label>
  <input type="password" name="oldPw" id="oldPw" required>
</div>
<div>
  <label for="newPw">新密码</label>
  <input type="password" name="newPw" id="newPw" required>
</div>
<div>
  <label for="confirmPw">确认密码</label>
  <input type="password" name="confirmPw" id="confirmPw" required>
</div>
<div>
  <button onclick="changePassword()">确认修改</button>
</div>
<div id="msg"></div>

Among them, the input tags with id oldPw, newPw and confirmPw respectively represent the original password, new password and confirmation password entered by the user, and the div tag with id msg is used for output. Error message.

Then the javascript code:

function changePassword() {
  var oldPw = document.getElementById("oldPw").value;
  var newPw = document.getElementById("newPw").value;
  var confirmPw = document.getElementById("confirmPw").value;
  
  if (newPw != confirmPw) {
    document.getElementById("msg").innerHTML = "两次输入的密码不一致";
    return;
  }
  
  var xhr = new XMLHttpRequest();
  xhr.open("POST", "/changePassword");
  xhr.setRequestHeader("Content-type", "application/json");
  xhr.onreadystatechange = function() {
    if (xhr.readyState == 4 && xhr.status == 200) {
      var response = JSON.parse(xhr.responseText);
      if (response.success) {
        alert("密码修改成功");
      } else {
        document.getElementById("msg").innerHTML = "原密码输入错误";
      }
    }
  }
  xhr.send(JSON.stringify({oldPw: oldPw, newPw: newPw}));
}

First, we use document.getElementById to get the original password, new password and confirmation password entered by the user. Then, we check whether the new password and the confirmed password are consistent. If they are inconsistent, we output an error message on the page and end the function. Next, we create an XMLHttpRequest object, set the request method to POST, and the request address to "/changePassword". In the request header, we set Content-type to application/json, which means data in json format. Then, we set up a callback function, and when the server returns normal, it parses the returned data in json format to determine whether the password has been modified successfully. If the modification is successful, we output a prompt box; if the original password is entered incorrectly, we output an error prompt.

Finally, we package the original password and new password entered by the user into a json format string and send it to the server to complete the password modification operation.

The above is my idea and code to implement password modification through javascript. The code is simple and clear, but not perfect. For example, we need to check the format of the entered password, and conduct more rigorous verification of the request method and submitted data. In the actual development process, we also need to consider more situations and make modifications and improvements according to needs.

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