[英]Getting error Cannot read property 'getTime' of undefined
我每天尝试设置倒数计时时遇到此错误。 这是我的脚本:
var date;
var display = document.getElementById('time');
$(document).ready(function() {
getTime('GMT', function(time){
date = new Date(time);
});
});
setInterval(function() {
date = new Date(date.getTime() + 1000);
var currenthours = date.getHours();
var hours;
var minutes;
var seconds;
if (currenthours != 21){
if (currenthours < 21) {
hours = 20 - currenthours;
} else {
hours = 21 + (24 - currenthours);
}
minutes = 60 - date.getMinutes();
seconds = 60 - date.getSeconds();
if (minutes < 10) {
minutes = '0' + minutes;
}
if (seconds < 10) {
seconds = '0' + seconds;
}
display.innerHTML = hours + ':' + minutes + ':' +seconds;
} else {
display.innerHTML = 'LIVE NOW';
}
}, 1000);
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;
})());
}
导致此错误的行是
date = new Date(date.getTime() + 1000);
基本上,我想做的是创建一个每天重置的倒计时。
$(document).ready
的getTime
调用需要花费一秒钟以上的时间才能完成,这意味着您要在setInterval
第一次执行之前对其进行设置。 因此, date
变量尚未设置。
要解决此问题,请在初始化回调函数中的date
变量之后将setInterval
调用移至,以确保始终在setInterval
函数执行之前设置date
。
var date;
var display = document.getElementById('time');
$(document).ready(function() {
getTime('GMT', function(time){
date = new Date(time);
setInterval(function() {
date = new Date(date.getTime() + 1000);
var currenthours = date.getHours();
var hours;
var minutes;
var seconds;
if (currenthours != 21){
if (currenthours < 21) {
hours = 20 - currenthours;
} else {
hours = 21 + (24 - currenthours);
}
minutes = 60 - date.getMinutes();
seconds = 60 - date.getSeconds();
if (minutes < 10) {
minutes = '0' + minutes;
}
if (seconds < 10) {
seconds = '0' + seconds;
}
display.innerHTML = hours + ':' + minutes + ':' +seconds;
} else {
display.innerHTML = 'LIVE NOW';
}
}, 1000);
});
});
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;
})());
}
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