else 语句不起作用

Question

I don't know why my else statement didn't work.

It's my first time that actually happened and I checked using console.log() .

This is my code:

setTimeout(function() {
  var b = 2;
  var d = 80000;
  if ("div[class='resultInfo resultLose']") {
    setTimeout(function() {
      var a = ($("input[name='_4']").val().replace(/\s+/g, ''));
      var c = a * b;
      $("input[name='_4']").val(c);
      $("input[value='Play!']").click();
    }, 1000);
  } else if ("div[class='resultInfo resultWin']") {
    setTimeout(function() {
      $("input[name='_4']").val(d);
      $("input[value='Play!']").click();
    }, 1000);
  }
}, 4500);

I have tried to:

1. delete the setTimeout in if
2. delete the " if ("div[class='resultInfo resultWin']") "

This only uses first if even the elseif is true , I don't know what to do.

Answer 1

You are having a non-empty string inside your if condition, which evaluates to true every time. So else block will never be reached.

Answer 2

Your current if and else/if conditions are just testing the truthiness of a random string which will always evaluate to true. Since the first condition evaluates to true, you will always skip the else if condition (even though that will also evaluate to true in this instance).

What you actually seem to want to test is whether or not there are elements that exist that match the strings you have as selector strings . If that's the case, your simplest fix would be to change your if and else statements to look more like jQuery statements and checking the length of the result.

if ($("div[class='resultInfo resultLose']").length > 0)

and

else if ($("div[class='resultInfo resultWin']").length > 0)

Answer 3

Your code doesn't make sense.

You aren't entering the else if because your if will always evaluate to true .

if ("div[class='resultInfo resultLose']") will always be true , as you're not doing any comparision, you're evaluating a string. So that's the same as doing if (true) .

I supose you're missing some code there, like a JQuery selection or something like that.