如何循环检查用户输入密码的次数? [英] How to check with loops how many times user punched a password?
问题描述
在我的家庭作业中，我必须设置一个测试，要求用户输入密码(三遍).如果用户输入错误密码三次，那么我必须显示一条消息密码错误".此外，我还必须考虑用户名和密码的三种变体
On my homework assignment I have to set up a test that ask the user for the password ( three times). If the user punches wrong password three times, then I must display a message " Wrong password". Also I have to take into account three variants of the username and password
我想我设置了预定义的密码，如test"、password"等.我会对用户名做同样的事情.所以基本上我只知道如何计算用户输入用户名和密码的次数......
I am thinking that I set up a predefined passwords like "test", "password" and so on. The same I will do with the usernames. So basically I just know how to count how many times the user punches the username and password...
<!DOCTYPE html>
<html>
<body>
<script>
var password = "";
while(password = "" || password != "password"||username !="Bella"||username="") {
username=prompt ("What´s your username?);
passord = prompt("What´s the password?");
}
alert("That was correct!");
</script>
</body>
</html>
用户名是什么?密码是多少?
What´s the username? What´s the password?
错误 - 输入 3 次这是正确的
wrong - typed 3 times That was correct
推荐答案
<!DOCTYPE html>
<html>
<body>
<script>
var incorrectCount = 0;
var correctPassword = "randompassword"
function checkPassword(){
var enteredPassword = document.getElementById("txtpassword").value;
if(enteredPassword != correctPassword)
incorrectCount++
else{
incorrectCount = 0
document.getElementById("userMessage").innerHTML = "Correct Password !!"
}
if(incorrectCount == 3){
document.getElementById("userMessage").innerHTML = "Incorrect password entered 3 or more times"
document.getElementById("userMessage").style.visibility = "visible";
}
}
</script>
<input type="text" id="txtpassword" name ="txtpassword">
<input type="button" id="loginbutton" value="Login" onclick="checkPassword()"><br>
<label id="userMessage" style="visibility:hidden;"></label>
</body>
</html>
- 您不需要为此使用循环.
- 您可以只拥有一个全局变量，并在每次用户输入错误密码时递增它.
- 一旦计数器达到 3，您就可以显示消息.
- 请参考上面的代码.
另外，尝试搜索诸如 - 如何验证输入、如何显示/显示消息 - 这将有助于您学习
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