我在这里做错了什么？ 否则

Question

So I'm having trouble here. It's an assignment, basically I ask a question of what 3+3 is and the user can put the right answer in... 6 and it will say "Correct!" If it's not a number, then it will say "please type in a number..." If it's 5 or 7 then it will say "Very close, try again" if it's anything other than 5 6 or 7 it wills say "incorrect" and if nothing is type in it should say "come on, you can do it." What am I doing wrong here???? Currently all it's doing is saying yes, 6 is correct! even when i type in a different number

var question;
question = window.prompt("What's the sum of 3+3?", "");

question = parseFloat(question);
if (isNaN(question)) {
  output = "Please enter a number";
} else if (question = 6) {
  output = "Yes " + question + " is correct!";
} else if (question = 5) {
  output = "Very close, try again!";
} else if (question = 7) {
  output = "Very close, try again!";
} else if (question = null) {
  output = "Come on, you can do it!!";
} else {
  output="Incorrect, Please try again"
}

document.write(output);

Answer 1

In your code you user question=8 in if which mean you assign 8 to question.

= means assign and == mean comparing

Try this :

 var question; question = window.prompt("What's the sum of 3+3?",""); question = parseFloat(question); if (isNaN(question)) { output= "Please enter a number"; }else if (question==6) { output="Yes " +question+" is correct!"; }else if (question==5){ output="Very close, try again!"; }else if (question==7){ output="Very close, try again!"; }else if (question==null){ output="Come on, you can do it!!"; } else {output="Incorrect, Please try again"} document.write(output); 

Answer 2

As noted in @Anik Islam Abhi's answer and the comments = is not the same as == .

== is a comparison operator ( read more )

= is an assignment operator ( read more )

Now, what you need to do is decide what means for the user to enter nothing ? I will assume you mean any amount of whitespace.

What you can do is always remove all whitespace from the inputed answer and if the user still inputed nothing then you know you should print "Come on, you can do it!!"

 // get the question and remove all whitespace so we know if the user enter an empty string var question = window.prompt("What's the sum of 3+3?","").trim().replace(' ',''); if (!question) { // nothing output = "Come on, you can do it!!"; } else if(isNaN(question)) { // not a number output = "Please enter a number"; } else if (question == 6) { // correct answer output = "Yes " +question+" is correct!"; } else if (question == 5 || question == 7) { // close answer output = "Very close, try again!"; } else { output="Incorrect, Please try again" // incorrect answer } document.write(output);