getTime JS代碼無法正常工作

Question

我想要做的是顯示一個默認的字符串，當達到一定的時間時，它必須更新該字符串。該字符串將在後面有css的h1中更新。

這是我的代碼：

<h1 id="header" class="loginhead" ></h1> 
    <script> 
     //pu8t in onload 
     document.onload = setDateChange(); 

     function setDateChange(){ 
      // datestring format yyyy-mm-dd hh:mm:ss 
      String output ="Welcome to the All-Stars Summit Registration Site, Canada"; 
      if (Date().getTime() > Date("2015-07-15 23:59:00").getTime()) 
       { 
        output ="The All-Stars Summit Registration Site, Canada, is now closed"; 
       } 
     document.getElementById('header').innerHTML = output; //change the html/text inside of the span with the id closed'. 
     } 

    setDateChange(); 

    //figure out which date is next 
    //********************* 
    var timeTillNextDate = Date("2015-07-15 23:59:00").getTime(); 
    var timeTillRun = Date("2015-07-15 23:59:00").getTime() - Date().getTime(); 
    if(timeTillRun > 0){ 
     setTimeout(setDateChange()), timeTillNextDate); //will wait to call changeHeader function until timeTillChange milliseconds have occured. 
    } 
    </script> 

的的jsfiddle鏈接是在這裏：JSFiddle Code

Answer 1

你需要做一些修改錯誤

1. 變化Date()固定到new Date()無論在何處使用。
2. 刪除多餘的括號。修改

setTimeout(setDateChange()),timeTillNextDate);

到

setTimeout(setDateChange(),timeTillNextDate);

String不在JS數據類型。因此，將其更改爲var

String output到var output

Answer 2

可否請您更換所有Date()有：

(new Date()) 

由於大部分的功能上工作object比class。例如：

var timeTillNextDate = (new Date("2015-07-15 23:59:00")).getTime(); 
var timeTillRun = (new Date("2015-07-15 23:59:00")).getTime() - (new Date()).getTime(); 

Answer 3

替換Date()與(new Date())作爲@PraveenKumar曾建議。

隨着你在這裏

String output ="Welcome to the All-Stars Summit Registration Site, Canada";

一個語法錯誤，它應該是，

var output ="Welcome to the All-Stars Summit Registration Site, Canada";

檢查javaScript Strings

而且還setTimeout(setDateChange(), timeTillNextDate)應該setTimeout(setDateChange, timeTillNextDate)

最後的js代碼的樣子，

document.onload = setDateChange(); 

      function setDateChange(){ 
       // datestring format yyyy-mm-dd hh:mm:ss 
       var output ="Welcome to the All-Stars Summit Registration Site, Canada"; 
       if (new Date().getTime() > (new Date("2015-07-15 23:59:00").getTime())) 
        { 
         output ="The All-Stars Summit Registration Site, Canada, is now closed"; 
        } 
      document.getElementById('header').innerHTML = output; //change the html/text inside of the span with the id closed'. 
      } 

     setDateChange(); 

     //figure out which date is next 
     //********************* 
     var timeTillNextDate = (new Date("2015-07-15 23:59:00")).getTime(); 
     var timeTillRun = (new Date("2015-07-15 23:59:00")).getTime() - (new Date()).getTime(); 
     if(timeTillRun > 0){ 
      setTimeout(setDateChange, timeTillNextDate); //have occured. 
     }