JavaScript不會正確更改iframe src

我最近開始對JS感興趣，並且一直在愚弄。我在我的HTML代碼中嵌入了一些嵌入式JS，並想知道爲什麼它不能正常工作。代碼似乎總是將src更改爲http://www.learn ... fillitin_mult_twelve.xml，無論選擇哪個框。測試here。JavaScript不會正確更改iframe src

 <iframe height="400" width="600" id="multGame" src="http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_six.xml"></iframe> 


     <select id="timestableSlt" onchange="changeGame()"> 
      <option value="1">1</option> 
      <option value="2">2</option> 
      <option value="3">3</option> 
      <option value="4">4</option> 
      <option value="5">5</option> 
      <option value="6" selected="selected">6</option> 
      <option value="7">7</option> 
      <option value="8">8</option> 
      <option value="9">9</option> 
      <option value="10">10</option> 
      <option value="11">11</option> 
      <option value="12">12</option> 
     </select> 
     <script> 
     function changeGame() { 
      var e = document.getElementById("timestableSlt"); 
      var strUser = e.options[e.selectedIndex].text; 


      if (strUser = "1") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_one.xml"; 
      } else if (strUser = "2") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_two.xml"; 
      } else if (strUser = "3") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_three.xml"; 
      } else if (strUser = "4") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_four.xml"; 
      } else if (strUser = "5") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_five.xml"; 
      } else if (strUser = "7") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_seven.xml"; 
      } else if (strUser = "8") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_eight.xml"; 
      } else if (strUser = "9") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_nine.xml"; 
      } else if (strUser = "10") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_ten.xml"; 
      } else if (strUser = "11") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_eleven.xml"; 
      } else if (strUser = "12") { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_twelve.xml"; 
      } else { 
      document.getElementById('multGame').src = "http://www.learninggamesforkids.com/_games/Main.swf?xml=assets/fill_in_blanks/fillitin_mult_six.xml"; 
      } 
     } 
     </script>

來源

2016-02-12 David Wheatley

問題是你的比較'='....使用'strUser ===「5」' – CMedina

@CMedina我會盡力的！ –

@CMedina工作。謝謝！如果你發佈它，我會接受這個答案;-) –