我正在开发一个内部工具的插件,用于跟踪处理特定任务所需的时间。我提供了它所用时间的视觉参考,但是使用数据库中的时间戳来捕获真值。
在我正在处理的插件中,我正在尝试构建一个将计数器重置为零的销毁函数。
我是如何做到的只是破坏了这个插件的原始元素。我想这会让垃圾收集器清理其他任何东西。
我认为这不起作用的原因是因为我添加了一行,随着时间的推移更新了document title
。当我“摧毁”它时,标题行为都很时髦,就像计时器仍在继续,即使我启动它的实际计时器被重置,就像我预期的那样。
如何判断这是否被正确销毁?
http://jsfiddle.net/9bf4jmao/3/
// BEGIN THE PLUGIN
var globalContainer;
(function($) {
$.fn.upCount = function(options, callback) {
var settings = $.extend({
startTime: null,
offset: null,
reset: null,
resume: null
}, options);
// Save container
var container = this;
globalContainer = container.parent().html();
// get the current date
var currentDate = function() {
// get client's current date
var date = new Date();
// turn date to utc
var utc = date.getTime() + (date.getTimezoneOffset() * 60000);
// set new Date object
var new_date = new Date(utc + (3600000 * settings.offset))
return new_date;
};
// Define some global vars
var original_date = currentDate();
var target_date = new Date('12/31/2020 12:00:00'); // Count up to this date
// Are we resetting our counter?
if(settings.reset){
reset();
}
// Do we need to start our counter at a certain time if we left and came back?
if(settings.startTime){
resumeTimer(new Date(settings.startTime));
}
// Reset the counter by destroying the element it was bound to
function reset() {
var timerContainer = $('[name=timerContainer]');
timerContainer.empty().append(globalContainer).find('.time').empty().append('00');
}
// Given a start time, lets set the timer
function resumeTimer(startTime){
original_date = startTime;
}
// Start the counter
function countUp() {
// Set our current date
var current_date = currentDate();
// difference of dates
var difference = current_date - original_date;
//console.log(original_date)
if (current_date >= target_date) {
// stop timer
clearInterval(interval);
if (callback && typeof callback === 'function') callback();
return;
}
// basic math variables
var _second = 1000,
_minute = _second * 60,
_hour = _minute * 60,
_day = _hour * 24;
// calculate dates
var days = Math.floor(difference / _day),
hours = Math.floor((difference % _day) / _hour),
minutes = Math.floor((difference % _hour) / _minute),
seconds = Math.floor((difference % _minute) / _second);
// fix dates so that it will show two digets
days = (String(days).length >= 2) ? days : '0' + days;
hours = (String(hours).length >= 2) ? hours : '0' + hours;
minutes = (String(minutes).length >= 2) ? minutes : '0' + minutes;
seconds = (String(seconds).length >= 2) ? seconds : '0' + seconds;
// based on the date change the refrence wording
var ref_days = (days === 1) ? 'day' : 'days',
ref_hours = (hours === 1) ? 'hour' : 'hours',
ref_minutes = (minutes === 1) ? 'minute' : 'minutes',
ref_seconds = (seconds === 1) ? 'second' : 'seconds';
// set to DOM
container.find('.days').text(days);
container.find('.hours').text(hours);
container.find('.minutes').text(minutes);
container.find('.seconds').text(seconds);
container.find('.days_ref').text(ref_days);
container.find('.hours_ref').text(ref_hours);
container.find('.minutes_ref').text(ref_minutes);
container.find('.seconds_ref').text(ref_seconds);
// Update our title
document.title = 'Task Tracker - ' + days +'.'+hours+':'+minutes+':'+seconds;
};
// start
interval = setInterval(countUp, 1000);
};
})(jQuery);
// END THE PLUGIN
我正在做的是调用$('.countdown').upCount({reset:true});
以便销毁(或者我想破坏它)
更新 我更新了小提琴,表明即使在插件被“销毁”之后,该元素仍然会被更新,这表明某些事情本来就没有完成。
更新2
当我在聊天中提出这个问题时,我被告知我interval = setInterval(...) but scope block it
。
我不太清楚该怎么做,从那时起就无法得到答案。
答案 0 :(得分:0)
最好的猜测是我没有看到你清除你的间隔:
StringBuilder
但是,您需要在脚本顶部初始化该变量,我没有看到。
// in your reset function, you should be stopping the interval:
clearInterval(interval);