Question

我需要确保它以Z开头，最少有8个字符并且有*。考虑这个功能：

function validatePassword()    
{
var strPassword 

//Request user enter their password then check its validity

strPassword = prompt("Please Enter A Valid Password","");

while ((strPassword.length <7) || (strPassword.indexOf('*') ==-1)  || (strPassword.charAt(0) != 'Z')) {
{
alert("Your password is invalid, \n Please try again")
strPassword = prompt("Please Enter A Valid Password","");
}

//Outcome if password is valid

alert("Your password is valid")

//End while

}
}

Answer 1

你在最后一次OR检查时得到了双{。括号太多了。

function validatePassword()    
{
    var strPassword  = prompt("Please Enter A Valid Password","");
    while ((strPassword.length <7) || 
        (strPassword.indexOf('*') ==-1)  || 
        (strPassword.charAt(0) != 'Z'))
    {
        alert("Your password is invalid, \n Please try again");
        strPassword = prompt("Please Enter A Valid Password","");
    }
    alert("Your password is valid");
}

Answer 2

您的strPassword.length < 7应该是strPassword.length < 8，还是因其他要求而失败？

编辑：我会将有效密码的测试分开，并为每个密码打印出更有意义的消息。然后你应该明白它失败的原因。

Answer 3

这一个是完整的

http://jsfiddle.net/mplungjan/mvwRj/

function validatePassword() {
  var strPassword;

  //Request user enter their password then check its validity

  strPassword = prompt("Please Enter A Valid Password - Starts with Z minimum 8 chars including an *","");

  while (strPassword==null || strPassword.length <8 ||
                               strPassword.indexOf('*') ==-1  ||
                               strPassword.charAt(0) != 'Z') {
    alert("Your password is invalid, \n Please try again")
    strPassword = prompt("Please Enter A Valid Password","");
  }   //End while


  //Outcome if password is valid

  alert("Your password is valid")

}
validatePassword();

它有时会说密码在实际有效时无效

3 个答案: