是否存在诸如if不匹配或else循环之类的问题。 我需要帮助使此JavaScript脚本正常工作

Question

How would i get a response according to a mismatch, or possibly like an Else loop but this doesn't appear to work since i get it even if i answer the question correctly, and if maybe i could do something like and if mismatch or something. I am new to JavaScript, so i cannot solve this myself.

var PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
    while (PromptAnswer3 === null | PromptAnswer3 === "") 
    {
    alert("You didn't answer");
    PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
    }
if (PromptAnswer3.match(/^(tennis|bowling|baseball|soccer|basketball|football|cricket|hockey|ice|hockey|rugby|track|golf|horseracing|water polo|swimming|biking|gymnastics|cheer-leading|skiing|snowboarding|iceskating|lacrosse|surfing|archery|boxing|kayaking|diving|spelunking|fencing|karate|judo|rockclimbing|softball|volleyball|wrestling|badminton|javelin throwing|synchronized swimming|yoga|ringette)!?$/i)) 
{
alert("Haha yeah, " + PromptAnswer3 "is pretty awesome.");
}
  while (PromptAnswer3)
{
  alert("I don't think that is a sport.");
  PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
}

Edit [should possibly be added as an answer]

This is what i did to make it work. It is simple and easy. I followed some of the peoples advice on the answers and put the if statement in the loop, while (PromptAnswer3), and put an else and a break in the if so that it wouldn't loop after the first time.

else {
    var PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
    while (PromptAnswer3 === null | PromptAnswer3 === "") 
    {
        alert("You didn't answer");
        PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
    }
    while (PromptAnswer3)
{
if (PromptAnswer3.match(/^(tennis|bowling|baseball|soccer|basketball|football|cricket|hockey|ice|hockey|rugby|track|golf|horseracing|water polo|swimming|biking|gymnastics|cheer-leading|skiing|snowboarding|iceskating|lacrosse|surfing|archery|boxing|kayaking|diving|spelunking|fencing|karate|judo|rockclimbing|softball|volleyball|wrestling|badminton|javelin throwing|synchronized swimming|yoga|ringette)!?$/i)) 
{
    alert("Haha yeah, " + PromptAnswer3 + "is pretty awesome.");
    break;
    }
    else {
      alert("I don't think that is a sport.");
      PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
    }
    }
}

Answer 1

First off:

alert("Haha yeah, " + PromptAnswer3 "is pretty awesome.");

should have an additional plus, no?

alert("Haha yeah, " + PromptAnswer3 + "is pretty awesome.");

That jumps out at me.

Also, your second while(PromptAnswer3) should be an else. So maybe something like this:

var PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
while (PromptAnswer3 === null | PromptAnswer3 === "") {
    alert("You didn't answer");
    PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
    if (PromptAnswer3.match(/^(tennis|bowling|baseball|...)!?$/i)) {
      alert("Haha yeah, " + PromptAnswer3 "is pretty awesome.");
    } else {
      alert("I don't think that is a sport.");
      PromptAnswer3 = prompt("Well, what sports do you like to play?", "");
    }
}

I can't tell when you want to exit, but this looks like it never exits. Maybe that is your intent. Those are things that look odd to me, but I did not test it.

Answer 2

I think you just need to add an else to your if

if ([comparison is true]) {
    // you have a match 
} else {
    // you do not
}

Answer 3

var PromptAnswer3;
while( !(PromptAnswer3 = prompt("Well, what sports do you like to play?", ""))) {
    // your regex may no work properly
    if(!/^(rugby|track|...)$/i.test(PromptAnswer3)) {
        alert("Haha yeah, " + PromptAnswer3 + "is pretty awesome.");
    }else {
        alert("I don't think that is a sport.");
        PromptAnswer3 = null;
    }
}

Answer 4

• Your indentation style is hard to read, IMO
• Did you really want to use a bitwise or in your first if statement? ( | )
• use test to test if a regular expression matches a string. Don't use match for this.

• Just invert the logic in your while statements.

   var PromptAnswer3 = prompt("Well, what sports do you like to play?", ""); while (!PromptAnswer3) { alert("You didn't answer"); PromptAnswer3 = prompt("Well, what sports do you like to play?", ""); } while (!/^(tennis|bowling|baseball|soccer|basketball|football|cricket|hockey|ice|hockey|rugby|track|golf|horseracing|water polo|swimming|biking|gymnastics|cheer-leading|skiing|snowboarding|iceskating|lacrosse|surfing|archery|boxing|kayaking|diving|spelunking|fencing|karate|judo|rockclimbing|softball|volleyball|wrestling|badminton|javelin throwing|synchronized swimming|yoga|ringette)!?$/i.test(PromptAnswer3)) { alert("I don't think that is a sport."); PromptAnswer3 = prompt("Well, what sports do you like to play?", ""); } alert("Haha yeah, " + PromptAnswer3 "is pretty awesome."); 

Answer 5

var answer = true,
    sportsRegex = /many|options/i,
    sport = true;
do {
    var question = "Well, what sports do you like to play?";
    if (!answer)
        question = "You didn't answer\n" + question;
    else if (!sport)
        question = "I don't know that as a sport.\n" + question;
    answer = prompt(question,"");
    sport = answer.match(sportsRegex);
 } while (!sport)
 sport = sport[0]; // depends on your regex
 alert("Haha yeah, " + sport + " is pretty awesome.");

Such Questions are always a nice usecase for the do-while construct.