如何通过javascript获取ntp时间 [英] how to get ntp time from through javascript

问题描述

亲爱的所有我正在使用此功能获取GMT时间，我是java脚本的新手，当我调用函数getTime时，它在网页上生成警报作为其编码，我想在窗口上打印时间我尝试用'document.write'替换'alert'但是它在窗口上没有打印，请提出任何建议：

Dear all i am using this function to get the GMT time, i am new to java script when i call the function getTime its generating an alert on the webpage as its coded, i want to print to time on the window i try replaced 'alert' by 'document.write' but its printing nothing on the window, any suggestions please:

这里是代码：

function getTime(zone, success) {
var url = 'http://json-time.appspot.com/time.json?tz=' + zone,
ud = 'json' + (+new Date());
window[ud]= function(o){
success && success(new Date(o.datetime));
};
document.getElementsByTagName('head')[0].appendChild((function(){
var s = document.createElement('script');
s.type = 'text/javascript';
s.src = url + '&callback=' + ud;
return s;
})());
}
getTime('GMT', function(time){ // This is where you do whatever you want with the time:     
alert(time); });

推荐答案

嗯，你正在做的例子，但还没读过整个解释。

Well you are doing and example but haven't read the entire explanation.

在你的情况下，只是提醒时间是正常的，因为你要求它这样做。
如果您想要特定的GMT日期格式，您可以这样做：

In your case it is normal to just alert the time since you are asking it to do it. If you want a specific GMT date format you could do:

// Get London time, and format it:
getTime('Europe/London', function(time){
var formatted = time.getHours() + ':' 
              + time.getMinutes() + ':'
              + time.getSeconds();
alert( 'The time in London is ' + formatted );
});

编辑：

如果你想在您可以添加的窗口上打印时间，例如HTML中的SPAN标记，其ID为'gmtTime'并具有以下内容：

If you want to print the time on the window you could add for example a SPAN tag in your HTML with an id let's say 'gmtTime' and have the following:

 // Get London time, and format it:
    getTime('Europe/London', function(time){
    var formatted = time.getHours() + ':' 
                  + time.getMinutes() + ':'
                  + time.getSeconds();
    document.getElementById("gmtTime").innerHTML= formatted;
    });

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