2015-11-29 85 views
0

我是新來的Javascript,並與定時器玩了一下。我發現基於測試字段輸入here的倒數計時器的代碼,我試圖向同一頁面添加一個計數器計時器,但它不工作。基於用戶輸入的Javascript倒計時和countup計時器

<html> 
<body> 
<div id="countdown"></div> 
<div id="countup"></div> 
<div id="notifier"></div> 

<script type="text/javascript"> 
function startTimer() { 
    userInput = document.getElementById('userTime').value; 
    if(userInput.length == 0){ 
     alert("Please enter a value"); 
    } else { 
    var numericExpression = /^[0-9]+$/; 
    if(!userInput.match(numericExpression)){ 
     alert("Please enter a number") 
    } else { 
     var countuptime = 0; 
     function display(notifier, str) { 
      document.getElementById(notifier).innerHTML = str; 
     } 

     function toMinuteAndSecond(x) { 
     return Math.floor(x/60) + ":" + x%60; 
     } 

     function setTimer(remain, actions, countuptime) { 
      (function countup() { 
       display("countup", toMinuteAndSecond(userInput - countuptime)); 
       (countuptime+= 1) <= userInput && setTimeout(arguments.callee, 1000); 
      })(); 
      (function countdown() { 
       display("countdown", toMinuteAndSecond(remain)); 
       actions[remain] && actions[remain](); 
       (remain -= 1) >= 0 && setTimeout(arguments.callee, 1000); 
      })(); 
     } 

     setTimer(userInput, { 
     10: function() { display("notifier", "Just 10 seconds to go"); }, 
      5: function() { display("notifier", "5 seconds left");  }, 
      0: function() { display("notifier", "Time is up");  } 
     }); 
    } 
    } 
} 
</script> 
Please Enter A Number: <input type="text" id="userTime" /> 
<input type="button" value="Go" onclick="startTimer()" /> 
</body> 
</html> 

基本上,我試圖創建一個從0開始,直到它是一樣的userInput,此時應立即停止上升一個新的變量(countuptime)。但是,當我嘗試測試時,向上計時器顯示NaN:NaN。我正試圖遠離JQuery並獲得Javascript的基礎知識。

回答

0

當你定義「setTimer」函數時,你設置了3個參數,但是當你調用它時,你提供了兩個參數。這就是爲什麼第三個參數'countuptime'保持未定義的原因。此外,您不必刪除userInput中的countuptime值。看看這個: -

<html> 
<body> 
<div id="countup"></div> 
<div id="notifier"></div> 
<script type="text/javascript"> 
function startTimer() { 
    userInput = document.getElementById('userTime').value; 
    if(userInput.length == 0){ 
     alert("Please enter a value"); 
    } else { 
    var numericExpression = /^[0-9]+$/; 
    if(!userInput.match(numericExpression)){ 
     alert("Please enter a number") 
    } else { 
     var countuptime = 0; 
     function display(notifier, str) { 
      document.getElementById(notifier).innerHTML = str; 
     } 

     function toMinuteAndSecond(x) { 
     return Math.floor(x/60) + ":" + x%60; 
     } 

     function setTimer(remain, actions, countuptime) { 
      (function countup() { 
       display("countup", toMinuteAndSecond(countuptime)); 
       (countuptime+= 1) <= userInput && setTimeout(arguments.callee, 1000); 
      })(); 

     } 

     setTimer(userInput, { 
     10: function() { display("notifier", "Just 10 seconds to go"); }, 
      5: function() { display("notifier", "5 seconds left");  }, 
      0: function() { display("notifier", "Time is up");  } 
     }, countuptime); 
    } 
    } 
} 
</script> 
Please Enter A Number: <input type="text" id="userTime" /> 
<input type="button" value="Go" onclick="startTimer()" /> 
</body> 
</html> 
+0

啊,傻我。謝謝! – an14