getTime JS代码无法正常工作

Question

我想要做的是显示一个默认的字符串，当达到一定的时间时，它必须更新该字符串。该字符串将在后面有css的h1中更新。

这是我的代码：

<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链接是在这里：JSFiddle Code

Answer 1

你需要做一些修改错误

1. 变化Date()固定到new Date()无论在何处使用。
2. 删除多余的括号。修改

setTimeout(setDateChange()),timeTillNextDate);

到

setTimeout(setDateChange(),timeTillNextDate);

String不在JS数据类型。因此，将其更改为var

String output到var output

Answer 2

可否请您更换所有Date()有：

(new Date()) 

由于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

替换Date()与(new Date())作为@PraveenKumar曾建议。

随着你在这里

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

一个语法错误，它应该是，

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

检查javaScript Strings

而且还setTimeout(setDateChange(), timeTillNextDate)应该setTimeout(setDateChange, timeTillNextDate)

最后的js代码的样子，

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. 
     }